Details of the Researcher

PHOTO

Qiang Chen
Section
Graduate School of Engineering
Job title
Professor
Degree
  • 博士(工学)(東北大学)

Profile

Dr. Qiang Chen received the B.E. degree from Xidian University, Xi'an, China, in 1986, the M.E. and D.E. degrees from Tohoku University, Sendai, Japan, in 1991 and 1994, respectively. He is currently Chair Professor of Electromagnetic Engineering Laboratory with the Department of Communications Engineering, Faculty of Engineering, Tohoku University. His primary research interests include antennas, microwave and millimeter wave, electromagnetic measurement and computational electromagnetics.

He received the Best Paper Award and Zen-ichi Kiyasu Award from the Institute of Electronics, Information and Communication Engineers (IEICE). He served as the Chair of IEICE Technical Committee on Photonics-applied Electromagnetic Measurement from 2012 to 2014, the Chair of IEICE Technical Committee on Wireless Power Transfer from 2016 to 2018, the Chair of IEEE Antennas and Propagation Society Tokyo Chapter from 2017 to 2018, the Chair of IEICE Technical Committee on Antennas and Propagation from 2019 to 2021. IEICE Fellow.

Research History 5

  • 2007/04 - 2013/03
    東北大学 工学研究科 Associate Professor Associate Professor

  • 2000/06 - 2007/03
    東北大学 工学研究科 Associate Professor Associate Professor

  • 1997/04 - 2000/05
    東北大学 工学研究科 Research Associate

  • 1994/04 - 1997/03
    東北大学 工学部 Research Associate

  • 2013/04 -
    Tohoku University Graduate School of Engineering Professor

Education 3

  • Tohoku University Graduate School, Division of Engineering 電気及び通信工学

    - 1994/03

  • Tohoku University Graduate School, Division of Engineering 電気及び通信工学

    - 1991/03

  • Xidian University Faculty of Engineering アンテナ・マイクロ波

    - 1986/07

Committee Memberships 22

  • IEICE Technical Committee on Antennas and Propagation Advisor

    2022/06 - Present

  • International Steering Committee of International Symposium on Antennas and Propagation (ISAP) Chair

    2023/11 - 2025/11

  • Steering Committee of 2025 International Symposium on Antennas and Propagation (ISAP2025) Chair

    2018/11 - 2025/11

  • Steering Committee of 2024 IEEE International Workshop on Antenna Technology (iWAT2024) Chair

    2023/05 - 2024/05

  • IEICE Technical Committee on Wireless Power Transfer Member

    2018/06 - 2024/05

  • IEICE Tohoku Section Chair

    2022/06 - 2023/05

  • IEICE Technical Committee on Antennas and Propagation Chair

    2019/05 - 2021/05

  • Tokyo Chapter of IEEE Antennas and Propagation Society Chair

    2017/01 - 2018/12

  • IEICE Technical Committee on Wireless Power Transfer Chair

    2016/06 - 2018/06

  • IEICE Technical committee on Photonics-applied Electromagnetic Measurement Chair

    2012/05 - 2014/05

  • IEICE Technical Committee on Electromagnetic Compatibility Member

    2007/05 - 2013/05

  • IEICE Technical Committee on Antennas and Propagation Member

    2010/05 - 2012/05

  • IEICE Transactions on Communications Aassociate Aditor

    2007/05 - 2012/05

  • IEEE EMC-S Sendai Chapter Treasurer

    2010/01 - 2011/12

  • 電子情報通信学会アンテナ・伝播研究専門委員会 幹事

    2008/05 - 2010/05

  • IEICE Technical Committee on Electromagnetic Theory Member

    2003/05 - 2009/05

  • IEICE Technical Committee on Antennas and Propagation Member

    2004/05 - 2008/05

  • 映像情報メディア学会東北支部 庶務幹事

    2004/05 - 2007/05

  • 電子情報通信学会環境電磁工学研究専門委員会 幹事

    2004/05 - 2006/05

  • 映像情報メディア学会 学会誌編集委員会委員

    2004/05 - 2006/05

  • IEEE AP-S Tokyo Chapter Secretary/Treasurer

    1998/01 - 1998/12

  • 電子情報通信学会環境電磁工学研究専門委員会 幹事補佐

    1994/10 - 1996/05

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Professional Memberships 2

  • IEEE

  • 電子情報通信学会

Research Interests 3

  • microwave applications

  • propagation

  • antenna

Research Areas 2

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Communication and network engineering / Analysis of Electromagnetics

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Electronic devices and equipment / Antennas

Awards 27

  1. 第74回「電波の日」東北総合通信局長表彰

    2024/06 総務省東北総合通信局

  2. ComEX Best Letter Award

    2024/05 IEICE Communications Society A composite antenna with high-gain at dual-band

  3. 教育功労賞

    2023/03 電子情報通信学会

  4. 東北大学基金功績賞

    2023/01 東北大学

  5. 功労顕彰状

    2018/09 電子情報通信学会通信ソサイエティ

  6. The 1th Place of the Best Paper Award

    2017/10 International Symposium on Antennas and Propagation (ISAP2017) Dipole Antenna with Sheath-Cover For Seawater Use

  7. 功労賞

    2017/06 電子情報通信学会アンテナ・伝播研究専門委員会

  8. Fellow

    2017 IEICE

  9. 功労顕彰状

    2014/09 電子情報通信学会通信ソサイエティ

  10. Fellow of The Electromagnetics Academy

    2014/08 The Electromagnetics Academy

  11. 功労賞

    2014/06/10 アンテナ・伝播研究専門委員会

  12. 第64回「電波の日」東北総合通信局長表彰

    2014/06/02 総務省東北総合通信局

  13. 通信ソサイエティ活動功労賞

    2012/09/12 電子情報通信学会通信ソサイエティ 英文論文誌編集委員としての貢献

  14. 功労賞

    2012/06/14 アンテナ・伝播研究専門委員会

  15. 感謝状

    2012/05/25 電子情報通信学会通信ソサイエティ英文論文誌編集委員会 通信ソサイエティ英文論文誌編集委員会の運営・編集に関する献身的活動

  16. 通信ソサイエティ活動功労賞

    2010/09 電子情報通信学会通信ソサイエティ アンテナ・伝播研究専門委員会幹事としての貢献

  17. 功労賞

    2010/06/10 アンテナ・伝播研究専門委員会

  18. Best Paper Award

    2009/05/23 電子情報通信学会 誘電体に対するガラーキンモーメント法―端部電荷を考慮した直方体モノポー ル間の自己・相互インピーダンスの単積分化―(論文誌B 20・9)

  19. 喜安善市賞

    2009/05/23 電子情報通信学会 誘電体に対するガラーキンモーメント法―端部電荷を考慮した直方体モノポー ル間の自己・相互インピーダンスの単積分化―(論文誌B 20・9)

  20. Best Paper Award

    2008/10/30 International Symposium on Antennas and Propagation Microstrip Reflectarray Using Crossed-Dipole with Frequency Selective Surface of Loops

  21. 功労賞

    2008/06/19 アンテナ・伝播研究専門委員会

  22. 功労賞

    2007/06/21 アンテナ・伝播研究専門委員会

  23. 通信ソサイエティ活動功労賞

    2006/09/20 電子情報通信学会通信ソサイエティ 環境電磁工学研究専門委員会幹事としての貢献

  24. 論文誌賞

    2004/09/22 電子情報通信学会通信ソサイエティ

  25. 通信ソサイエティ活動功労感謝状

    1996/09 電子情報通信学会通信ソサイエティ

  26. Young Scientist Award

    1993/08 International Union of Radio Science Analysis of MRI Slotted Tube Resonator Loaded by a Dielectric Cylinder

  27. 学術奨励賞

    1993/03 電子情報通信学会 Analysis of MRI Slotted Tube Resonator inside Conducting Circular Cylinder

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Papers 403

  1. Compact Self-Packaged Low-Loss SISL LPF Using Symmetric Tri-Section SIRs

    Daotong Li, Hao Wang, Jiaxin Wang, Ning Pan, Ying Liu, Qiang Chen, Naoki Shinohara

    IEEE Transactions on Components, Packaging and Manufacturing Technology 2025

    DOI: 10.1109/TCPMT.2025.3592083  

  2. High Gain Wideband Filtering Quasi-Yagi Antenna Based on High-Order Mode of SSPPs

    Daotong Li, Ning Pan, Hao Wang, Jiang Dong, Qi Jiang, Ying Liu, Naoki Shinohara, Qiang Chen

    IEEE Transactions on Antennas and Propagation 2025

    DOI: 10.1109/TAP.2025.3583825  

  3. First English article of Yagi-Uda antenna

    Qiang CHEN

    Proceedings of the Japan Academy, Series B 2025

    DOI: 10.2183/pjab.101.001  

  4. Design of Dual-Band Omnidirectional Horizontally Polarized Dipole Antenna Array With Cylindrical Radome Covered

    Junyi Xu, Sirao Wu, Qiang Chen

    IEEE Antennas and Wireless Propagation Letters 2024/12

    DOI: 10.1109/LAWP.2024.3436617  

  5. Graph Coloring-Based Pilot Assignment for User-Cluster-Centric Cell-Free Massive MIMO Systems

    Sijie Xia, Qiang Chen, Fumiyuki Adachi

    2024 IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS) 1-4 2024/08/21

    Publisher: IEEE

    DOI: 10.1109/apwcs61586.2024.10679280  

  6. A Novel Electromagnet-Controlled Reflectarray Element Employing 1-Bit Height Locking System with Low Power Consumption

    Ao Hu, Keisuke Konno, Qiang Chen

    IEICE Communications Express 2024/07

    DOI: 10.23919/comex.2024XBL0044  

  7. Interference Suppression Multiuser MMSE Multiplexing Combined with Optimal Joint Transmit/Receive Diversity for a Cellular Distributed MU-MIMO System

    Ryo Takahashi, Hidenori Matsuo, Qiang Chen, Fumiyuki Adachi

    2024 IEEE 99th Vehicular Technology Conference (VTC2024-Spring) 1-5 2024/06/24

    Publisher: IEEE

    DOI: 10.1109/vtc2024-spring62846.2024.10683064  

  8. Low-Profile Dual-Band Shared-Aperture Base Station Antennas Based on FSS Radiators

    Hui Li, Jiawen Xu, Yang Nan, Qiang Chen, Changfei Zhou

    IEEE Antennas and Wireless Propagation Letters 2024/06

    DOI: 10.1109/LAWP.2024.3372529  

  9. Accuracy Improvement of Impedance Measurement for Nonlinear Devices

    Chang Ge, Qiaowei Yuan, Qiang Chen

    2024 IEEE Wireless Power Technology Conference and Expo (WPTCE) 2024/05/08

    Publisher: IEEE

    DOI: 10.1109/wptce59894.2024.10557299  

  10. Self-Packaged mm-Wave Broadband Air-Filled SIW Filtering Power Divider With Sharp Roll-Off Skirt and High In-Band Isolation

    Daotong Li, Jiaxin Wang, Linsong Shi, Ying Liu, Kai-Da Xu, Qiang Chen, Naoki Shinohara

    IEEE Microwave and Wireless Technology Letters 34 (5) 482-485 2024/05

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/lmwt.2024.3382592  

    ISSN: 2771-957X

    eISSN: 2771-9588

  11. On the Field Measurement of a Highly Efficient Reflectarray Antenna Using Electromagnets

    Ao Hu, Keisuke Konno, Qiang Chen

    2024 IEEE International Workshop on Antenna Technology (iWAT) 2024/04/15

    Publisher: IEEE

    DOI: 10.1109/iwat57102.2024.10535820  

  12. Development of Two-Dimensional Steerable Reflectarray With Liquid Crystal for Reconfigurable Intelligent Surface Applications

    Xiaotong Li, Hiroyasu Sato, Hideo Fujikake, Qiang Chen

    IEEE Transactions on Antennas and Propagation 2024/03

    DOI: 10.1109/TAP.2024.3354054  

  13. Compact Leaky Wave Fed Frequency-Scanning Gradient Index Lens Antenna for Near-Field-Focusing Applications

    Kevin Kipruto Mutai, Qiang Chen

    IEEE Transactions on Antennas and Propagation 2024/03

    DOI: 10.1109/TAP.2024.3353375  

  14. Planar Printed Wideband Filtering Quasi-Yagi Antenna and Its Notch-Band Design Using Parasitic Elements for Vehicular Communication

    Daotong Li, Chen Yang, Ying Liu, Lisheng Yang, Qiang Chen

    IEEE Transactions on Vehicular Technology 2024/02

    DOI: 10.1109/TVT.2023.3314974  

  15. Integration Design of Passive Filtering Nonmagnetic Circulator Based on Spatiotemporal Modulation of Microstrip Filtering Delay Networks

    Daotong Li, Chen Yang, Ying Liu, Luqi Zhang, Qiang Chen

    IEEE Transactions on Microwave Theory and Techniques 2024/02

    DOI: 10.1109/TMTT.2023.3311918  

  16. A High-Gain Pattern and Beamwidth Reconfigurable Dielectric Resonator Antenna based on Parasitic Metal Panels

    Daotong Li, Lanlan Yang, Linsong Shi, Jiaxin Wang, Ying Liu, Naoki Shinohara, Qiang Chen

    IEEE Transactions on Antennas and Propagation 2024

    DOI: 10.1109/TAP.2024.3486452  

  17. [Paper] Enhancing Millimeter Wave Reflect Arrays with Thick LC Devices Utilizing Two-Direction Electric Field Driving

    Ryo Aoyanagi, Masakazu Nakatani, Takahiro Ishinabe, Hiroyasu Sato, Qiang Chen, Hideo Fujikake

    ITE Transactions on Media Technology and Applications 12 (4) 233-240 2024

    Publisher: Institute of Image Information and Television Engineers

    DOI: 10.3169/mta.12.233  

    eISSN: 2186-7364

  18. [Paper] Advanced Liquid Crystals with Low Loss Tangent and Fast Response for Intelligent Reflecting Surface Antennas

    Toru Fujisawa, Hiroyasu Sato, Wataru Ishikawa, Hiraku Toshima, Masakazu Nakatani, Takahiro Ishinabe, Hideo Fujikake, Qiang Chen

    ITE Transactions on Media Technology and Applications 12 (4) 218-225 2024

    Publisher: Institute of Image Information and Television Engineers

    DOI: 10.3169/mta.12.218  

    eISSN: 2186-7364

  19. A 2-bit 3D-Printed Reflectarray Antenna Using Cylindrical Rotation-Based Phase Tunable Elements

    Ao Hu, Keisuke Konno, Qiang Chen

    IEEE Transactions on Antennas and Propagation 1-1 2024

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/tap.2024.3451133  

    ISSN: 0018-926X

    eISSN: 1558-2221

  20. Generalised Impedance Model of Wireless Links Assisted by Reconfigurable Intelligent Surfaces

    Keisuke Konno, Sergio Terranova, Qiang Chen, Gabriele Gradoni

    IEEE Transactions on Antennas and Propagation 2024

    DOI: 10.1109/TAP.2024.3417629  

  21. Adaptive Interference Suppressing Multi-User ZF in Cluster-Centric Cell-Free Massive MIMO Systems

    Sijie Xia, Chang Ge, Ryo Takahashi, Qiang Chen, Fumiyuki Adachi

    IEEE Communications Letters 2024

    DOI: 10.1109/LCOMM.2024.3384670  

  22. SIW Cavity Mode Analysis and Control Techniques for Compact Wide-Stopband Filters Design

    Daotong Li, Wei Luo, Xiaoquan Chen, Jiaxin Wang, Chen Yang, Kai-Da Xu, Qiang Chen

    IEEE Transactions on Circuits and Systems II: Express Briefs 2024

    DOI: 10.1109/TCSII.2024.3364816  

  23. High-Gain Wideband Dielectric Resonator Antenna Based on Semi-Cylindrical Grooved Structure

    Daotong Li, Linsong Shi, Jiaxin Wang, Ying Liu, Qiang Chen

    IEEE Transactions on Circuits and Systems II: Express Briefs 2024

    DOI: 10.1109/TCSII.2023.3326480  

  24. Compact Filtering Power Divider With Sharp Roll-Off Skirt and Deep Suppression Using Coupled Square Ring Resonator

    Daotong Li, Luqi Zhang, Ying Liu, Chen Yang, Qiang Chen

    IEEE Transactions on Components, Packaging and Manufacturing Technology 2024

    DOI: 10.1109/TCPMT.2024.3363227  

  25. A Highly Efficient 1-bit Reflectarray Antenna Using Electromagnet-Controlled Elements

    Ao Hu, Keisuke Konno, Qiang Chen, Toru Takahashi

    IEEE Transactions on Antennas and Propagation 2024/01

    DOI: 10.1109/TAP.2023.3324457  

  26. Self-Decoupled Multi-Antennas with Coupling Modes Identification and Suppression

    Hui Li, Yang Nan, Jia-Wen Xu, Qiang Chen, Tian-Xi Feng

    IEEE Antennas and Wireless Propagation Letters 2024

    DOI: 10.1109/LAWP.2024.3430372  

  27. A Method of Dual-Bias Voltage Supply for Reducing Reflection Loss in Reconfigurable Intelligent Surfaces of Liquid Crystal

    Yue Cui, Hiroyasu Sato, Kai-Da Xu, Hideo Fujikake, Qiang Chen

    IEEE Antennas and Wireless Propagation Letters 2024

    DOI: 10.1109/LAWP.2024.3398736  

  28. An Optimization Method for Coupled-Line Bandpass Filters Using Transformer-Based Estimator and Multilayer Perceptron

    Kai-Da Xu, Jing Tian, Yijun Cai, Daotong Li, Wen Wu, Qiang Chen

    IEEE Transactions on Circuits and Systems II: Express Briefs 2024

    DOI: 10.1109/TCSII.2024.3380412  

  29. A Wideband Filtering Switch: Its Synthesis and Design

    Kai-Da Xu, Xiaoyu Weng, Qiang Chen, Haijun Fan

    IEEE Transactions on Microwave Theory and Techniques 2024/01

    DOI: 10.1109/TMTT.2023.3297720  

  30. A High Gain Filtering Quasi-Yagi Antenna Based on Compressed Third-Order Mode Dipole

    Daotong Li, Chen Yang, Linsong Shi, Ying Liu, Qiang Chen, Naoki Shinohara

    IEEE Antennas and Wireless Propagation Letters 1-5 2024

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/lawp.2024.3409748  

    ISSN: 1536-1225

    eISSN: 1548-5757

  31. A Low-Cost Wideband Reflectarray Antenna Based on Nonradiative Dielectric Waveguide

    Wen Wu, Kai-Da Xu, Qiang Chen, Toru Tanaka, Masaki Kozai, Hiroya Minami

    IEEE Antennas and Wireless Propagation Letters 2023/12

    DOI: 10.1109/LAWP.2023.3312177  

  32. Graded-Index-Fiber-Inspired 3-D Printed Surface Focusing Porous Dielectric Structure With GaAs MMIC Rectenna Toward Millimeter-Wave Wireless Power Transfer Application

    Wenyi Shao, Bo Yang, Naoki Sakai, Tsukasa Hirai, Kenji Itoh, Qiang Chen, Naoki Shinohara

    IEEE Antennas and Wireless Propagation Letters 22 (12) 3177-3181 2023/12

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/lawp.2023.3312691  

    ISSN: 1536-1225

    eISSN: 1548-5757

  33. Characteristic Analysis of Parallel and Anti-Parallel Coupled Line Structures and Their Integrated Design in Filtering Power Dividers

    Daotong Li, Luqi Zhang, Jiaxin Wang, Ying Liu, Qiang Chen

    IEEE Transactions on Components, Packaging and Manufacturing Technology 2023/11

    DOI: 10.1109/TCPMT.2023.3328946  

  34. Compact Tri-Band SIW Bandpass Filters With High Selectivity and Controllable Center Frequencies Using Perturbation Structure

    Daotong Li, Xiaoquan Chen, Wei Luo, Zhirui Zheng, Qiang Chen

    IEEE Transactions on Circuits and Systems II: Express Briefs 2023/11

    DOI: 10.1109/TCSII.2023.3281496  

  35. Source Reconstruction Method Using Fourier Transform and Eigenmode Currents

    Keisuke Konno, Kazuto Mochiki, Qiang Chen

    2023 IEEE International Symposium On Antennas And Propagation (ISAP) 2023/10/30

    Publisher: IEEE

    DOI: 10.1109/isap57493.2023.10388883  

  36. Miniaturized Dual-/Tri-/Quad-Band Bandpass Filters Using Perturbed Multimode SIW Cavity

    Daotong Li, Wei Luo, Xiaoquan Chen, Ying Liu, Kai-Da Xu, Qiang Chen

    IEEE Transactions on Components, Packaging and Manufacturing Technology 2023/10

    DOI: 10.1109/TCPMT.2023.3311439  

  37. Uplink Postcoding in User-Cluster-Centric Cell-Free Massive MIMO.

    Ryo Takahashi, Hidenori Matsuo, Sijie Xia, Qiang Chen 0001, Fumiyuki Adachi

    IEICE Transactions on Communications 106 (9) 748-757 2023/09

    DOI: 10.1587/transcom.2022fgt0001  

  38. Frequency-Scanning Leaky-Wave Array Antenna With Extended Scanning Range for Millimeter-Wave Imaging

    Kevin Kipruto Mutai, Qiang Chen

    IEEE Antennas and Wireless Propagation Letters 2023/08

    DOI: 10.1109/LAWP.2023.3271296  

  39. Machine-Learning-Assisted Antenna Optimization With Data Augmentation

    Jiapeng Zhang, Jiawen Xu, Qiang Chen, Hui Li

    IEEE Antennas and Wireless Propagation Letters 2023/08

    DOI: 10.1109/LAWP.2023.3269811  

  40. DOA estimation and object localization based on multi-harmonic multi-beam characteristic of 1-bit time-modulated reflectarray

    Xianbo Cao, Qiang Chen, Toru Tanaka, Masaki Kozai, Hiroya Minami

    IEICE Communications Express 2023/08/01

    DOI: 10.1587/comex.2023TCL0008  

  41. High-Gain Omnidirectional Horizontally Polarized Dipole Array for Sub-6 Base Station

    Sirao Wu, Junyi Xu, Qiang Chen

    IEEE Antennas and Wireless Propagation Letters 2023/07

    DOI: 10.1109/LAWP.2023.3257385  

  42. A Leay Wave Antenna With Dielectric Superstrate on Perforated Dielectric Spacer

    Takuya Kaji, Hiroyasu Sato, Qiang Chen, Shimpei Nagae, Akira Kumagai, Osamu Kagaya

    IEEE Transactions on Antennas and Propagation 2023/06

    DOI: 10.1109/TAP.2023.3266036  

  43. Single-Layer Dual-/Tri-Band SIW Filtenna Based on Multifunctional Cavity-Backed Slots

    Zhirui Zheng, Daotong Li, Xiaoheng Tan, Qiang Chen

    IEEE Transactions on Antennas and Propagation 2023/05

    DOI: 10.1109/TAP.2023.3242110  

  44. Near-Field Leaky-Wave Focusing Antenna With Tapered Dielectric Constant Distribution

    Kevin Kipruto Mutai, Hiroyasu Sato, Qiang Chen

    IEEE Antennas and Wireless Propagation Letters 2023/05

    DOI: 10.1109/LAWP.2023.3236644  

  45. A Compact Low-Profile Differential Dual-Polarized Filtenna Without an External Filter Circuit for Vehicular Communications

    Zhirui Zheng, Daotong Li, Xiaoheng Tan, Qiang Chen

    IEEE Transactions on Vehicular Technology 2023/05

    DOI: 10.1109/TVT.2022.3230220  

  46. A 1-bit Time-Modulated Reflectarray for Reconfigurable-Intelligent-Surface Applications

    Xianbo Cao, Qiang Chen, Toru Tanaka, Masaki Kozai, Hiroya Minami

    IEEE Transactions on Antennas and Propagation 2023/03

    DOI: 10.1109/TAP.2022.3233659  

  47. Rotationally Reconfigurable Single-Element Prism for Enhancing Scanning Flexibility of Risley Prism Antenna System

    Wenyi Shao, Qiang Chen

    IEEE Antennas and Wireless Propagation Letters 2023/03

    DOI: 10.1109/LAWP.2022.3217045  

  48. 2-Layer Interference Coordination Framework Based on Graph Coloring Algorithm for a Cellular System With Distributed MU-MIMO.

    Chang Ge 0005, Sijie Xia, Qiang Chen 0001, Fumiyuki Adachi

    IEEE Transactions on Vehicular Technology 72 (3) 3557-3568 2023/03

    DOI: 10.1109/TVT.2022.3219411  

  49. Learning Based on Graph: A Joint Interference Coordination for Cluster-Wise Distributed MU-MIMO.

    Chang Ge 0005, Sijie Xia, Qiang Chen 0001, Fumiyuki Adachi

    IEEE Communications Letters 27 (3) 871-875 2023/03

    DOI: 10.1109/LCOMM.2023.3239605  

  50. Single-Pixel Scanning Near-Field Imaging With Subwavelength Resolution Using Sharp Focusing Mikaelian Lens

    Wenyi Shao, Qiang Chen

    IEEE Transactions on Microwave Theory and Techniques 2023/02

    DOI: 10.1109/TMTT.2022.3205911  

  51. Sub-6 GHz Band Omnidirectional Horizontally Polarized Large Spacing Array Antenna With Dielectric Radome for Base Station

    Junyi Xu, Sirao Wu, Qiang Chen

    IEEE Access 2023

    DOI: 10.1109/ACCESS.2023.3341038  

  52. Compact Dual-Band SISL Filtering Antennas With High Selectivity Based on Dual Gap-Coupled Patches

    Zhirui Zheng, Xiaoheng Tan, Daotong Li, Mei Li, Qiang Chen

    IEEE Transactions on Antennas and Propagation 2023

    DOI: 10.1109/TAP.2023.3301628  

  53. A Systematic Method for Efficient Wireless Powering to Implantable Biomedical Devices

    Xianbo Cao, Hiroyasu Sato, Kai-Da Xu, Wen Jiang, Shuxi Gong, Qiang Chen

    IEEE Transactions on Antennas and Propagation 2023

    DOI: 10.1109/TAP.2023.3240005  

  54. A Low-Cost Structure for Reducing Reflection Loss in Intelligent Reflecting Surface of Liquid Crystal

    Yue Cui, Hiroyasu Sato, Yosei Shibata, Takahiro Ishinabe, Hideo Fujikake, Qiang Chen

    IEEE Antennas and Wireless Propagation Letters 1-5 2023

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/lawp.2023.3309304  

    ISSN: 1536-1225

    eISSN: 1548-5757

  55. A Novel Method of Moments for Numerical Analysis of Antennas Over Two-Dimensional Infinite Periodic Array of Scatterers

    Keisuke Konno, Nozomi Haga, Jerdvisanop Chararothai, Qiang Chen, Narihiro Nakamoto, Toru Takahashi

    IEEE Transactions on Antennas and Propagation 1-1 2023

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/tap.2023.3303025  

    ISSN: 0018-926X

    eISSN: 1558-2221

  56. Liquid Crystal Based Reflectarray for Reconfigurable Intelligent Surface Applications

    Xiaotong Li, Hiroyasu Sato, Yosei Shibata, Takahiro Ishinabe, Hideo Fujikake, Qiang Chen

    IEICE Communications Express 2023

    Publisher: Institute of Electronics, Information and Communications Engineers (IEICE)

    DOI: 10.1587/comex.2023spl0014  

    eISSN: 2187-0136

  57. A Wideband Reflectarray Based on Single-Layer Magneto-Electric Dipole Elements With 1-bit Switching Mode

    Wen Wu, Kai-Da Xu, Qiang Chen, Toru Tanaka, Masaki Kozai, Hiroya Minami

    IEEE Transactions on Antennas and Propagation 2022/12

    DOI: 10.1109/TAP.2022.3209693  

  58. On Design Concept of Cellular Distributed MU-MIMO for Ultra-dense RAN

    Fumiyuki Adachi, Ryo Takahashi, Hidenori Matsuo, Sijie Xia, Chang Ge, Qiang Chen

    2022 27th Asia Pacific Conference on Communications (APCC) 266-271 2022/10/19

    Publisher: IEEE

    DOI: 10.1109/apcc55198.2022.9943686  

  59. A Study on Cluster-Centric Cell-Free Massive MIMO System

    Sijie Xia, Chang Ge, Ryo Takahashi, Qiang Chen, Fumiyuki Adachi

    2022 27th Asia Pacific Conference on Communications (APCC) 2022/10/19

    Publisher: IEEE

    DOI: 10.1109/apcc55198.2022.9943729  

  60. Electromagnetic Under-the-Ice Localization and Communication

    Hiroshi Yoshida, Tatsuro Yonekura, Masaharu Takahashi, Nozomu Ishii, Qiang Chen, Ryotaro Suga

    OCEANS 2022, Hampton Roads 2022/10/17

    Publisher: IEEE

    DOI: 10.1109/oceans47191.2022.9977045  

  61. Evaluation of Uplink Capacity of User-Cluster-Centric Cell-Free massive MIMO

    Ryo Takahashi, Hidenori Matsuo, Sijie Xia, Qiang Chen, Fumiyuki Adachi

    2022 IEEE 96th Vehicular Technology Conference (VTC2022-Fall) 1-5 2022/09

    Publisher: IEEE

    DOI: 10.1109/vtc2022-fall57202.2022.10013011  

  62. An Experimental System Based on Pseudo-Scale Model of Air-Sea Two-Layer Problem Operated at 100 MHz

    Taiga Wakabayashi, Nozomu Ishii, Masaharu Takahashi, Qiang Chen

    2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM) 2022/08/29

    Publisher: IEEE

    DOI: 10.1109/iwem52897.2022.9993495  

  63. Numerical Evaluation on Tank Effect in a Pseudo-Scale Air-Sea Two-Layer Experimental Model

    Anri Kamiya, Nozomu Ishii, Masaharu Takahashi, Qiang Chen

    2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM) 2022/08/29

    Publisher: IEEE

    DOI: 10.1109/iwem52897.2022.9993480  

  64. Capacity-Fairness Tradeoff for Optimal Power Allocation in Cluster-wise MU-MIMO System

    Sijie Xia, Chang Ge, Qiang Chen, Fumiyuki Adachi

    2022 IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS) 2022/08/24

    Publisher: IEEE

    DOI: 10.1109/apwcs55727.2022.9906515  

  65. Evaluation of Partial Denture Management RFID System Using a Simple Phantom Model Peer-reviewed

    Y. Takatera, E. Nagahari, B. Dang, M. Motoyoshi, J. Xu, H. Sato, Q. Chen, N. Suematsu

    2022 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT) 107-109 2022/08

    Publisher: IEEE

    DOI: 10.1109/RFIT54256.2022.9882441  

  66. Planar Two-Dimensional Scanning Multibeam Array Antenna Based on a 3 × 3 Butler Matrix Network

    Shu-Kuan Zhao, Miao Lv, Zhi-ya Zhang, Qiang Chen, Guang Fu

    IEEE Antennas and Wireless Propagation Letters 2022/06

    DOI: 10.1109/LAWP.2022.3160456  

  67. Active Millimeter Wave Imaging Using Leaky-Wave Focusing Antenna

    Kevin Kipruto Mutai, Hiroyasu Sato, Qiang Chen

    IEEE Transactions on Antennas and Propagation 2022/05

    DOI: 10.1109/TAP.2021.3137533  

  68. [Paper] Fabrication of LC-Polymer Films Separating Thick LC Layer for Reflect Arrays

    Tomoya Haneda, Takahiro Ishinabe, Yosei Shibata, Hiroyasu Sato, Qiang Chen, Hideo Fujikake

    ITE Transactions on Media Technology and Applications 10 (4) 146-151 2022

    Publisher: Institute of Image Information and Television Engineers

    DOI: 10.3169/mta.10.146  

    eISSN: 2186-7364

  69. Compact Millimeter-Wave On-Chip Dual-Band Bandpass Filter in 0.15-μm GaAs Technology

    Kai-Da Xu, Shengpei Xia, Yannan Jiang, Ying-Jiang Guo, Yiqun Liu, Rui Wu, Jianlei Cui, Qiang Chen

    IEEE Journal of the Electron Devices Society 2022

    DOI: 10.1109/JEDS.2022.3143999  

  70. Millimeter-Wave E-Plane Waveguide Bandpass Filters Based on Spoof Surface Plasmon Polaritons

    Yiqun Liu, Kai-Da Xu, Jianxing Li, Ying-Jiang Guo, Anxue Zhang, Qiang Chen

    IEEE Transactions on Microwave Theory and Techniques 2022

    DOI: 10.1109/TMTT.2022.3197593  

  71. Quasi-Reflectionless Filters Using Simple Coupled Line and T-Shaped Microstrip Structures

    Kai-Da Xu, Sen Lu, Ying-Jiang Guo, Qiang Chen

    IEEE Journal of Radio Frequency Identification 6 54-63 2022

    Publisher: Institute of Electrical and Electronics Engineers ({IEEE})

    DOI: 10.1109/JRFID.2021.3106664  

  72. A Low-Loss and Compact UHF RFID Tag Antenna for Implanted Denture

    Junyi Xu, Hiroyasu Sato, Mizuki Motoyoshi, Noriharu Suematsu, Kazuhito Yasui, Qiang Chen

    IEEE Journal of Radio Frequency Identification 6 1-7 2022

    Publisher: Institute of Electrical and Electronics Engineers ({IEEE})

    DOI: 10.1109/JRFID.2021.3081183  

  73. A Study on Scattering Performance of Reflectarray Element Covered by Dielectric Superstrate

    Keisuke Konno, Qiang Chen

    IEEE Transactions on Antennas and Propagation 1-1 2022

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/tap.2022.3184526  

    ISSN: 0018-926X

    eISSN: 1558-2221

  74. Estimation of Equivalent Current Distribution Using Fourier Transform and Eigenmode Currents

    Kazuto Mochiki, Keisuke Konno, Qiang Chen

    IEEE Transactions on Electromagnetic Compatibility 1-11 2022

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/temc.2022.3172137  

    ISSN: 0018-9375

    eISSN: 1558-187X

  75. Development of Beam Steerable Reflectarray With Liquid Crystal for Both E-Plane and H-Plane

    Xiaotong Li, Hiroyasu Sato, Yosei Shibata, Takahiro Ishinabe, Hideo Fujikake, Qiang Chen

    IEEE Access 10 26177-26185 2022

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/access.2022.3155544  

    eISSN: 2169-3536

  76. Cellular Structuring and Clustering for Distributed Antenna Systems

    Sijie Xia, Chang Ge, Qiang Chen, Fumiyuki Adachi

    2021 24th International Symposium on Wireless Personal Multimedia Communications (WPMC) 2021/12/14

    Publisher: IEEE

    DOI: 10.1109/wpmc52694.2021.9700460  

  77. Reinforcement Learning-based Interference Coordination for Distributed MU-MIMO

    Chang Ge, Sijie Xia, Qiang Chen, Fumiyuki Adachi

    2021 24th International Symposium on Wireless Personal Multimedia Communications (WPMC) 2021/12/14

    Publisher: IEEE

    DOI: 10.1109/wpmc52694.2021.9700445  

  78. W-Band E-Plane Waveguide Bandpass Filter Based on Meander Ring Resonator

    Kai-Da Xu, Shengpei Xia, Ying-Jiang Guo, Jianlei Cui, Anxue Zhang, Qiang Chen

    IEEE Microwave and Wireless Components Letters 31 (12) 1267-1270 2021/12

    Publisher: Institute of Electrical and Electronics Engineers ({IEEE})

    DOI: 10.1109/LMWC.2021.3103638  

  79. Compact Spoof Surface Plasmon Polariton Waveguides With Simple Configurations and Good Performance

    Sen Lu, Kai-Da Xu, Ying-Jiang Guo, Qiang Chen

    IEEE Transactions on Plasma Science 49 (12) 3786-3792 2021/12

    Publisher: Institute of Electrical and Electronics Engineers ({IEEE})

    DOI: 10.1109/TPS.2021.3124045  

  80. Detection of Defective Elements in Array Antennas Using Artificial Neural Networks and Eigenmode Currents

    Keisuke Konno, Xin Wang, Qiang Chen

    2021 International Symposium on Antennas and Propagation (ISAP) 2021/10/19

    Publisher: IEEE

    DOI: 10.23919/isap47258.2021.9614371  

  81. 2-D Beam-Steerable Generalized Mikaelian Lens With Unique Flat-Shape Characteristic

    Wenyi Shao, Qiang Chen

    IEEE Antennas and Wireless Propagation Letters 20 (10) 2033-2037 2021/10

    Publisher: Institute of Electrical and Electronics Engineers ({IEEE})

    DOI: 10.1109/LAWP.2021.3102316  

  82. Graph Coloring-based Interference Coordination for Ultra-Dense Cellular Network with Distributed MU-MIMO

    Chang Ge, Sijie Xia, Qiang Chen, Fumiyuki Adachi

    2021 IEEE 94th Vehicular Technology Conference (VTC2021-Fall) 2021/09

    Publisher: IEEE

    DOI: 10.1109/vtc2021-fall52928.2021.9625356  

  83. Performance analysis of an all-dielectric planar Mikaelian lens antenna for 1-D beam-steering application

    Wenyi Shao, Qiang Chen

    Optics Express 2021/08/30

    DOI: 10.1364/OE.438182  

  84. Novel Design of Rectenna Array Using Metasurface for IoT

    Tamami Maruyama, Masashi Nakatsugawa, Noriharu Suematsu, Mizuki Motoyoshi, Qiang Chen, Hiroyasu Sato, Manabu Omiya

    2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC) 2021/08/09

    Publisher: IEEE

    DOI: 10.1109/apwc52648.2021.9539790  

  85. 60-GHz Compact Dual-Mode On-Chip Bandpass Filter Using GaAs Technology

    Kai-Da Xu, Ying-Jiang Guo, Yiqun Liu, Xianjin Deng, Qiang Chen, Zhewang Ma

    IEEE Electron Device Letters 42 (8) 1120-1123 2021/08

    Publisher: Institute of Electrical and Electronics Engineers ({IEEE})

    DOI: 10.1109/LED.2021.3091277  

  86. Perforated extensible 3-D hyperbolic secant lens antenna for directive antenna applications using additive manufacturing

    Wenyi Shao, Hiroyasu Sato, Xiaotong Li, Kevin Kipruto Mutai, Qiang Chen

    Optics Express 29 (12) 18932-18932 2021/06/07

    Publisher: The Optical Society

    DOI: 10.1364/OE.426824  

  87. High-Order Mode Application of Spoof Surface Plasmon Polaritons in Bandpass Filter Design

    Yiqun Liu, Kai-Da Xu, Ying-Jiang Guo, Qiang Chen

    IEEE Photonics Technology Letters 33 (7) 362-365 2021/04/01

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/lpt.2021.3063522  

    ISSN: 1041-1135

    eISSN: 1941-0174

  88. Method to Estimate Antenna Mode Radar Cross Section of Large-scale Array Antennas

    Lei Gan, Wen Jiang, Qiang Chen, Xiaoqiu Li, Zhipeng Zhou, Shuxi Gong

    IEEE Transactions on Antennas and Propagation 69 (10) 1-1 2021/04

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/tap.2021.3075536  

    ISSN: 0018-926X

    eISSN: 1558-2221

  89. SPICE Behaviors of Double Memristor Circuits Using Cosine Window Function

    Kai-Da Xu, Donghao Li, Yannan Jiang, Qiang Chen

    Frontiers in Physics 9 2021/03/03

    Publisher: Frontiers Media SA

    DOI: 10.3389/fphy.2021.648737  

    eISSN: 2296-424X

    More details Close

    In this paper, a Hewlett-Packard (HP) memristor model with a new window function and its versatile characteristics are presented. SPICE behaviors of the linear and nonlinear memristor model are studied through PSpice simulation. High flexibility is demonstrated for emulating the behaviors of the practical HP memristors. Furthermore, the characteristics of the composite SPICE behaviors are both investigated when two memristors are connected in series and in parallel. The polarity of each memristor is also taken into consideration. The relationships among flux, charge, voltage, current, and memristance of the double memristor circuits are simulated and analyzed.

  90. A Wideband, Multifunctional Reflect-Transmit-Array Antenna With Polarization-Dependent Operation

    Sen Liu, Qiang Chen

    IEEE Transactions on Antennas and Propagation 69 (3) 1383-1392 2021/03

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/tap.2020.3016509  

    ISSN: 0018-926X

    eISSN: 1558-2221

  91. Design of a Wide Planar Waveguide Antenna for UHF Near-Field RFID Reader With High Reading Rate

    Yusuke Ozawa, Qiang Chen, Kunio Sawaya, Machiko Oouchida, Masatomo Tokieda

    IEEE Journal of Radio Frequency Identification 5 (1) 46-52 2021/03

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/jrfid.2020.3039016  

    eISSN: 2469-729X

  92. Study on cluster formation for distributed MU-MIMO

    Sijie Xia, Chang Ge, Qiang Chen, Fumiyuki Adachi

    IEICE Communications Express 10 (3) 167-173 2021/03/01

    Publisher: Institute of Electronics, Information and Communications Engineers (IEICE)

    DOI: 10.1587/comex.2020xbl0180  

    eISSN: 2187-0136

  93. On-Chip GaAs-Based Spoof Surface Plasmon Polaritons at Millimeter-Wave Regime

    Kai-Da Xu, Ying-Jiang Guo, Qian Yang, Yong-Liang Zhang, Xianjin Deng, Anxue Zhang, Qiang Chen

    IEEE Photonics Technology Letters 33 (5) 255-258 2021/03/01

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/lpt.2021.3054962  

    ISSN: 1041-1135

    eISSN: 1941-0174

  94. A graph coloring-based interference coordination algorithm for cluster-wise ultra-dense RAN

    Chang Ge, Sijie Xia, Qiang Chen, Fumiyuki Adachi

    IEICE Communications Express 10 (2) 99-104 2021/02/01

    Publisher: Institute of Electronics, Information and Communications Engineers (IEICE)

    DOI: 10.1587/comex.2020xbl0160  

    eISSN: 2187-0136

  95. Application of an efficient method of moments to numerical analysis of 1-bit transmitarrays

    Keisuke Konno, Qiaowei Yuan, Qiang Chen, Kei Yokokawa, Jun Goto, Toru Fukasawa

    2020 International Symposium on Antennas and Propagation, ISAP 2020 107-108 2021/01/25

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI: 10.23919/ISAP47053.2021.9391406  

  96. Evaluation of Q factor of antennas in lossy medium

    Junyi Xu, Qiang Chen

    2020 International Symposium on Antennas and Propagation, ISAP 2020 159-160 2021/01/25

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI: 10.23919/ISAP47053.2021.9391355  

  97. An improved method in graph coloring algorithm for interference coordination in cluster-wise ultra-dense RAN

    Chang Ge, Sijie Xia, Qiang Chen, Fumiyuki Adachi

    2020 International Symposium on Antennas and Propagation, ISAP 2020 293-294 2021/01/25

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI: 10.23919/ISAP47053.2021.9391334  

  98. Array-fed dual-band transmitarray antenna with wide frequency ratio

    Sen Liu, Qiang Chen

    2020 International Symposium on Antennas and Propagation, ISAP 2020 569-570 2021/01/25

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI: 10.23919/ISAP47053.2021.9391154  

  99. Near field leaky-wave focusing antenna using inhomogeneous rectangular waveguide

    Hiroyasu Sato, Kevin Kipruto Mutai, Takuya Hashimoto, Qiang Chen

    2020 International Symposium on Antennas and Propagation, ISAP 2020 19-20 2021/01/25

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI: 10.23919/ISAP47053.2021.9391343  

  100. Undersea positioning using electromagnetic wave in consideration of sea wave effects

    Ryosuke Kato, Hiroki Kobayashi, Masaharu Takahashi, Nozomu Ishii, Qiang Chen, Hiroshi Yoshida

    2020 International Symposium on Antennas and Propagation, ISAP 2020 133-134 2021/01/25

    DOI: 10.23919/ISAP47053.2021.9391441  

  101. Verification of underwater position estimation using received power profile through pseudo-scale model

    Ryota Sase, Nozomu Ishii, Masaharu Takahashi, Qiang Chen, Hiroshi Yoshida

    2020 International Symposium on Antennas and Propagation, ISAP 2020 403-404 2021/01/25

    DOI: 10.23919/ISAP47053.2021.9391284  

  102. A Low-Profile Dielectric Resonator Antenna With Compact-Size and Wide Bandwidth by Using Metasurface

    Shu-Kuan Zhao, Neng-Wu Liu, Qiang Chen, Guang Fu, Xin-Peng Chen

    IEEE Access 9 29819-29826 2021

    Publisher: Institute of Electrical and Electronics Engineers ({IEEE})

    DOI: 10.1109/ACCESS.2021.3058352  

  103. Bandpass filter using coupled‐line‐stub cascaded structure with high stopband rejection

    Sen Lu, Kai‐Da Xu, Yingjiang Guo, Yi Ren, Qiang Chen

    Microwave and Optical Technology Letters 63 (1) 69-74 2021/01

    Publisher: Wiley

    DOI: 10.1002/mop.32555  

    ISSN: 0895-2477

    eISSN: 1098-2760

  104. High-Order Mode of Spoof Surface Plasmon Polaritons and Its Application in Bandpass Filters

    Kai-Da Xu, Sen Lu, Ying-Jiang Guo, Qiang Chen

    IEEE Transactions on Plasma Science 49 (1) 269-275 2021/01

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/tps.2020.3043889  

    ISSN: 0093-3813

    eISSN: 1939-9375

  105. Bandpass Filter Using Half-Mode Substrate Integrated Plasmonic Waveguide

    Yue Cui, Kai-Da Xu, Qiang Chen

    2020 IEEE Asia-Pacific Microwave Conference (APMC) 2020/12/08

    Publisher: IEEE

    DOI: 10.1109/apmc47863.2020.9331519  

  106. Design of Quasi-Reflectionless Filters with Simple Topologies

    Sen Lu, Kai-Da Xu, Yingjiang Guo, Qiang Chen

    2020 IEEE Asia-Pacific Microwave Conference (APMC) 2020/12/08

    Publisher: IEEE

    DOI: 10.1109/apmc47863.2020.9331576  

  107. Remembering Yasuto Mushiake [In Memoriam]

    Qiang Chen, Kunio Sawaya, W. Ross Stone

    IEEE Antennas and Propagation Magazine 62 (6) 106-107 2020/12

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/map.2020.3034504  

    ISSN: 1045-9243

    eISSN: 1558-4143

  108. Efficient Method of Moments for Numerical Analysis of Antennas With Variable Load Impedance

    Keisuke Konno, Qiaowei Yuan, Qiang Chen, Kei Yokokawa, Jun Goto, Toru Fukawasa

    IEEE Transactions on Antennas and Propagation 68 (12) 8233-8237 2020/12

    DOI: 10.1109/tap.2020.2985979  

    ISSN: 0018-926X

    eISSN: 1558-2221

  109. Spoof Surface Plasmon Polaritons Developed From Coplanar Waveguides in Microwave Frequencies

    Jianxing Li, Junwei Shi, Kai-Da Xu, Ying-Jiang Guo, Anxue Zhang, Qiang Chen

    IEEE Photonics Technology Letters 32 (22) 1431-1434 2020/11/15

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/lpt.2020.3031065  

    ISSN: 1041-1135

    eISSN: 1941-0174

  110. A Broadband On-Chip Bandpass Filter Using Shunt Dual-Layer Meander-Line Resonators

    Kai-Da Xu, Xi Zhu, Yang Yang, Qiang Chen

    IEEE Electron Device Letters 41 (11) 1617-1620 2020/11

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/led.2020.3027734  

    ISSN: 0741-3106

    eISSN: 1558-0563

  111. 2-step Graph Coloring Algorithm for Cluster-wise Distributed MU-MIMO in Ultra-dense RAN

    Chang Ge, Sijie Xia, Qiang Chen, Fumiyuki Adachi

    2020 23rd International Symposium on Wireless Personal Multimedia Communications (WPMC) 2020/10/19

    Publisher: IEEE

    DOI: 10.1109/wpmc50192.2020.9309477  

  112. A Study on User-antenna Cluster Formation for Cluster-wise MU-MIMO

    Sijie Xia, Chang Ge, Qiang Chen, Fumiyuki Adachi

    2020 23rd International Symposium on Wireless Personal Multimedia Communications (WPMC) 2020/10/19

    Publisher: IEEE

    DOI: 10.1109/wpmc50192.2020.9309519  

  113. A Wideband, 1 bit Transmitarray Antenna Design With Flat Gain Response

    Sen Liu, Hiroyasu Sato, Qiang Chen

    IEEE Transactions on Antennas and Propagation 68 (10) 7046-7055 2020/10

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/tap.2020.2995417  

    ISSN: 0018-926X

    eISSN: 1558-2221

  114. Multiband terahertz absorbers using T-shaped slot-patterned graphene and its complementary structure

    Kai-Da Xu, Yijun Cai, Xianbo Cao, Yingjiang Guo, Yongliang Zhang, Qiang Chen

    Journal of the Optical Society of America B 37 (10) 3034-3034 2020/10/01

    Publisher: The Optical Society

    DOI: 10.1364/josab.404062  

    ISSN: 0740-3224

    eISSN: 1520-8540

  115. In-body/Out-body Dual-Use Miniaturized RFID Tag System Using 920MHz/5.02GHz Bands

    Bowen Dang, Mizuki Motoyoshi, Junyi Xu, Hiroyasu Sato, Suguru Kameda, Qiang Chen, Noriharu Suematsu

    2020 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT) 148-150 2020/09

    Publisher: IEEE

    DOI: 10.1109/rfit49453.2020.9226219  

  116. Millimeter-Wave On-Chip Bandpass Filter Based on Spoof Surface Plasmon Polaritons

    Ying-Jiang Guo, Kai-Da Xu, Xianjin Deng, Xu Cheng, Qiang Chen

    IEEE Electron Device Letters 41 (8) 1165-1168 2020/08

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/led.2020.3003804  

    ISSN: 0741-3106

    eISSN: 1558-0563

  117. Coupled‐line band‐pass filter with T‐shaped structure for high frequency selectivity and stopband rejection

    Kai‐Da Xu, Sen Lu, Yi Ren, Anxue Zhang, Qiang Chen

    International Journal of RF and Microwave Computer-Aided Engineering 30 (8) 2020/08

    Publisher: Wiley

    DOI: 10.1002/mmce.22259  

    ISSN: 1096-4290

    eISSN: 1099-047X

  118. Theoretical Derivation and Optimization Verification of BER for Indoor SWIPT Environments

    Wei Chien, Tzong-Tyng Hsieh, Chien-Ching Chiu, Yu-Ting Cheng, Yang-Han Lee, Qiang Chen

    Symmetry 12 (7) 1185-1185 2020/07/17

    Publisher: MDPI AG

    DOI: 10.3390/sym12071185  

    eISSN: 2073-8994

    More details Close

    Symmetrical antenna array is useful for omni bearing beamforming adjustment with multiple receivers. Beam-forming techniques using evolution algorithms have been studied for multi-user resource allocation in simultaneous wireless information and power transfer (SWIPT) systems. In a high-capacity broadband communication system there are many users with wearable devices. A transmitter provides simultaneous wireless information and power to a particular receiver, and the other receivers harvest energy from the radio frequency while being idle. In addition, the ray bounce tracking method is used to estimate the multi-path channel, and the Fourier method is used to perform the time domain conversion. A simple method for reducing the frequency selective effort of the multiple channels using the feed line length instead of the digital phase shifts is proposed. The feed line length and excitation current of the transmitting antennas are adjusted to maximize the energy harvest efficiency under the bit error rate (BER) constraint. We use the time-domain multipath signal to calculate the BER, which includes the inter symbol interference for the wideband system. In addition, we use multi-objective function for optimization. To the best of our knowledge, resource allocation algorithms for this problem have not been reported in the literature. The optimal radiation patterns are synthesized by the asynchronous particle swarm optimization (APSO) and self-adaptive dynamic differential evolution (SADDE) algorithms. Both APSO and SADDE can form good patterns for the receiver for energy harvesting. However, APSO has a faster convergence speed than SADDE.

  119. アンテナの電力伝送効率から求めた近傍界領域と遠方界領域の境界

    青木 拓海, 佐竹 裕, 袁 巧微, 今野 佳祐, 陳 強

    電子情報通信学会論文誌 B J103-B (11) 551-558 2020/07

  120. Tunable multi-band terahertz absorber using a single-layer square graphene ring structure with T-shaped graphene strips

    Kai-Da Xu, Jianxing Li, Anxue Zhang, Qiang Chen

    Optics Express 28 (8) 11482-11482 2020/04/13

    Publisher: The Optical Society

    DOI: 10.1364/oe.390835  

    eISSN: 1094-4087

  121. ELF Electromagnetic Wave Localization for Under-the-ice Robots

    YOSHIDA Hiroshi, SATO Ryo, KATO Ryosuke, TAKAHASHI Masaharu, ISHII Nozomu, Qiang Chen, YONEKURA Tatsuro, MIYOSHI Tasuku

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2020 2P2-I05 2020

    Publisher: The Japan Society of Mechanical Engineers

    DOI: 10.1299/jsmermd.2020.2P2-I05  

    More details Close

    <p>Under-the-ice survey with underwater robots in Arctic is important to understand the global warming mechanism. We are currently studying localization method under-the-ice because acoustical positioning system does not use there. In this report, a new method of under-the-ice localization is proposed.</p>

  122. [Paper] Systematic Investigation of Molecular Structure of Nematic-phase Liquid Crystals for Reduction of Dielectric Loss in Microwave Control Applications

    Yoichi Murakami, Yosei Shibata, Hiroyasu Sato, Takahiro Ishinabe, Qiang Chen, Hideo Fujikake

    ITE Transactions on Media Technology and Applications 8 (4) 218-223 2020

    Publisher: Institute of Image Information and Television Engineers

    DOI: 10.3169/mta.8.218  

    eISSN: 2186-7364

  123. Analysis and Reduction on in-Band RCS of Fabry-Perot Antennas

    Lei Gan, Wen Jiang, Qiang Chen, Xiaoqiu Li, Zhipeng Zhou

    IEEE Access 8 146697-146706 2020

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/access.2020.3015050  

    eISSN: 2169-3536

  124. Near-field leaky-wave focusing antenna with inhomogeneous rectangular waveguide

    Takuya Hashimoto, Hiroyasu Sato, Qiang Chen

    IEICE Communications Express 9 (6) 218-223 2020

    Publisher: Institute of Electronics, Information and Communications Engineers (IEICE)

    DOI: 10.1587/comex.2020xbl0013  

    eISSN: 2187-0136

  125. A wideband transmitarray using triple-layer elements with reduced profile

    Xiuzhu Lv, Zhihua Han, Xin Jian, Yongliang Zhang, Qiang Chen

    IEICE Electronics Express 17 (1) 20190678-20190678 2020

    Publisher: Institute of Electronics, Information and Communications Engineers (IEICE)

    DOI: 10.1587/elex.16.20190678  

    eISSN: 1349-2543

  126. Diagnosis of Array Antennas Based on Phaseless Near-Field Data Using Artificial Neural Network

    Xin Wang, Nonmember Keisuke Konno, Qiang Chen

    IEEE Transactions on Antennas and Propagation 69 (7) 1-1 2020

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/tap.2020.3044593  

    ISSN: 0018-926X

    eISSN: 1558-2221

  127. Novel Reduced Matrix Equation Constructing Method Accelerates Iterative Solution of Characteristic Basis Function Method

    Z. Wang, Q. Chen, W.-Y. Nie, H. Lin

    Applied Computational Electromagnetics Society Journal 34 (12) 1814-1820 2019/12

  128. A Source Reconstruction Technique Using Eigenmode Currents

    Keisuke Konno, Qiang Chen

    2019 International Symposium on Antennas and Propagation (ISAP) 2019/10/27

  129. Dual-Beam Gain-Reconfigurable Antennas Using A Shared Reflectarray Aperture.

    Sen Liu, Qiang Chen

    2019 International Symposium on Antennas and Propagation (ISAP) 2019/10/27

  130. Wireless Power Transfer System Using Rectangular Waveguide with Cutoff Parallel Plate

    Hiroyasu Sato, Daisuke Nakamichi, Qiang Chen

    2019 International Symposium on Antennas and Propagation (ISAP) 2019/10/27

  131. Investigation of a 3D undersea positioning system using electromagnetic waves

    Ryosuke Kato, Masaharu Takahashi, Nozomu Ishii, Qiang Chen, Hiroshi Yoshida

    2019 23rd International Conference on Applied Electromagnetics and Communications (ICECOM) 69 (8) 4967-4974 2019/09

    Publisher: IEEE

    DOI: 10.1109/icecom48045.2019.9163613  

  132. Applied Reflectarray based on Metasurface for Wireless Power Transmission Efficiencys

    Tamami Maruyama, Qiang Chen, Noriharu Suematsu

    2019 23rd International Conference on Applied Electromagnetics and Communications (ICECOM) 2019/09

    Publisher: IEEE

    DOI: 10.1109/icecom48045.2019.9163614  

  133. X-Band Near-Field Focusing Leaky-Wave Antenna with Inhomogeneous Waveguide

    Takuya Hashimoto, Hiroyasu Sato, Qiang Chen

    2019 12th Global Symposium on Millimeter Waves (GSMM) 2019/05

    Publisher: IEEE

    DOI: 10.1109/gsmm.2019.8797653  

  134. Incoherent Active Millimeter-Wave Imaging Using Forward-Illuminating Source

    Atsuro Maeda, Hiroyasu Sato, Qiang Chen

    2019 12th Global Symposium on Millimeter Waves (GSMM) 2019/05

    Publisher: IEEE

    DOI: 10.1109/gsmm.2019.8797666  

  135. Relationship between liquid crystal molecular behaviors and dielectric loss for microwave frequency phase shifters

    Yoichi Murakami, Yosei Shibata, Hiroyasu Sato, Takahiro Ishinabe, Qiang Chen, Hideo Fujikake

    Proceedings of the International Display Workshops 2 376-378 2019

    Publisher: International Display Workshops

    ISSN: 1883-2490

  136. Applying Artificial Neural Network to diagnose Array Antennas

    Wang Xin, Keisuke Konno, Qiang Chen

    2019/01

  137. Experimental study of Ninja array antenna composed of Yagi-Uda antennas

    Keisuke Konno, Kohei Morita, Qiang Chen, Qiaowei Yuan

    IEICE Communications Express 8 (12) 554-559 2019

    Publisher: Institute of Electronics, Information and Communications Engineers (IEICE)

    DOI: 10.1587/comex.2019gcl0039  

    eISSN: 2187-0136

  138. Compact design of two-elements cubic Yagi-Uda array antenna with high gain

    Shimpei Nagae, Satoshi Suzuki, Keisuke Konno, Hiroyasu Sato, Qiang Chen

    IEICE Communications Express 8 (12) 652-656 2019

    Publisher: Institute of Electronics, Information and Communications Engineers (IEICE)

    DOI: 10.1587/comex.2019xbl0119  

    eISSN: 2187-0136

  139. Positioning Method for an AUV in Arctic Seawater Based on Polarization

    Bo Tang, Qiang Chen

    IEEE Antennas and Wireless Propagation Letters 18 (1) 177-181 2019/01

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/lawp.2018.2885068  

    ISSN: 1536-1225

    eISSN: 1548-5757

  140. Study on Frequency-domain Equalization Scheme for High-speed Digital Power Line Carrier Systems

    Norio Sasaki, Qiang Chen, Fumiyuki Adachi

    IEEJ Transactions on Electronics, Information and Systems 138 (12) 1529-1538 2018/12/01

    Publisher: Institute of Electrical Engineers of Japan (IEE Japan)

    DOI: 10.1541/ieejeiss.138.1529  

    ISSN: 0385-4221

    eISSN: 1348-8155

  141. Bandpass Filter with Capacitively Loaded Coupled Lines for Wideband Spurious Rejection

    Peng Chen, Luping Li, Kai Yang, Qiang Chen

    2018 Asia-Pacific Microwave Conference (APMC) 2018/11

    Publisher: IEEE

    DOI: 10.23919/apmc.2018.8617504  

  142. Scattering and Radiation Performance of Ninja Array Antennas

    Keisuke Konno, Qiang Chen, Qiaowei Yuan

    2018 Asia-Pacific Microwave Conference (APMC) 2018/11

    Publisher: IEEE

    DOI: 10.23919/apmc.2018.8617501  

  143. Hybrid Spoof Surface Plasmon Polariton and Substrate Integrated Waveguide Broadband Bandpass Filter With Wide Out-of-Band Rejection

    Peng Chen, Luping Li, Kai Yang, Qiang Chen

    IEEE Microwave and Wireless Components Letters 28 (11) 984-986 2018/11

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/lmwc.2018.2869290  

    ISSN: 1531-1309

    eISSN: 1558-1764

  144. Diagnosis of Array Antennas Using Eigenmode Currents and Near-Field Data

    Keisuke Konno, Shohei Asano, Tetsuya Umenai, Qiang Chen

    IEEE Transactions on Antennas and Propagation 66 (11) 5982-5989 2018/11

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI: 10.1109/tap.2018.2866544  

    ISSN: 0018-926X

    eISSN: 1558-2221

  145. Enabling Full-Duplex MIMO Communication Exploiting Array Antenna Arrangement

    Naoki Honma, Shotaro Heianna, Astuto Kawagoe, Shizuka Tada, Yoshiyuki Yamamoto, Qiaowei Yuan, Qiang Chen

    2018 International Symposium on Antennas and Propagation (ISAP) 2018/10/23

  146. Design of Inner-Layer Capsule Dipole Antenna For Ingestible Endoscope

    Hiroyasu Sato, Yang Li, Junyi Xu, Qiang Chen

    2018 International Symposium on Antennas and Propagation (ISAP) 2018/10/23

  147. EO Probe Design for Exposure Assessment in Human Body for 85 kHz EV Charging System

    Yuichi Nagumo, Keisuke Konno, Qiang Chen, Jerdvisanop Chakarothai, Kanako Wake, Soichi Watanabe

    2018 IEEE International Workshop on Electromagnetics:Applications and Student Innovation Competition (iWEM) 2018/08/29

  148. Design of a Near-Zero Refractive-Index Metamaterial Unit for Electromagnetic Cloaking

    Peng Chen, Kai Yang, Qiang Chen

    2018 IEEE International Workshop on Electromagnetics:Applications and Student Innovation Competition (iWEM) 2018/08

    Publisher: IEEE

    DOI: 10.1109/iwem.2018.8536727  

  149. Development of Denture Implanted RFID Tag Antennas

    Junyi Xu, Hiroyasu Sato, Mizuki Motoyoshi, Noriharu Suematu, Hiroyasu Kanetaka, Kazuhito Yasui, Qiang Chen

    2018 IEEE International Workshop on Electromagnetics:Applications and Student Innovation Competition (iWEM) 2018/08

    Publisher: IEEE

    DOI: 10.1109/iwem.2018.8536610  

  150. Application of Electromagnetic Simulation Techniques based on FDTD Method in Human Body Healthcare

    Yang Li, Bin Li, Hiroyasu Sato, Qiang Chen

    2018 International Applied Computational Electromagnetics Society Symposium - China (ACES) 2018/07

    Publisher: IEEE

    DOI: 10.23919/acess.2018.8669286  

  151. Design and Numerical Simulation of a Near-zero Refractive-index Metamaterial Unit

    Peng Chen, Chen Qiang

    IEICE Technical Report 2018/05

  152. A reflectarray using log-periodic dipole array element

    Keisuke Konno, Qiang Chen

    2018 IEEE MTT-S International Wireless Symposium (IWS) 2018/05

    Publisher: IEEE

    DOI: 10.1109/ieee-iws.2018.8400794  

  153. A Study of Novel Characteristic Basis Function Method for Numerical Analysis of Large-Scale Finite Planar Periodic Arrays

    Keisuke Konno, Qiang Chen

    2018 IEEE International Conference on Computational Electromagnetics (ICCEM) 2018/03

    Publisher: IEEE

    DOI: 10.1109/compem.2018.8496570  

  154. Numerical Study on a Rotationally-Symmetrical Dipole Array Antenna Position for a MIMO Full-Duplex System Peer-reviewed

    CHEN Qiang

    IEICE Commun. Express 7 (3) 101-106 2018/03

    DOI: 10.1587/comex.2017XBL0182  

  155. Impedance matching approach of L-section circuit with ohmic loss in reactive components Peer-reviewed

    Suzuki Satoshi, Yuan Qiaowei, Chen Qiang

    WIRELESS POWER TRANSFER 5 (1) 64-74 2018/03

    DOI: 10.1017/wpt.2017.21  

    ISSN: 2052-8418

  156. Ninja array antenna: Novel approach for low backscattering phased array antenna Peer-reviewed

    Keisuke Konno, Qiaowei Yuan, Qiang Chen

    IET Microwaves, Antennas and Propagation 12 (3) 346-353 2018/02/28

    DOI: 10.1049/iet-map.2017.0496  

    ISSN: 1751-8733 1751-8725

  157. Capsule antenna design based on transmission factor through the human body Peer-reviewed

    Yang Li, Hiroyasu Sato, Qiang Chen

    IEICE Transactions on Communications E101B (2) 357-363 2018/02/01

    Publisher: Institute of Electronics, Information and Communication, Engineers, IEICE

    DOI: 10.1587/transcom.2017ISP0028  

    ISSN: 1745-1345 0916-8516

  158. Propagation loss and position estimation of capsule antenna through human body phantom Peer-reviewed

    Hiroyasu Sato, Yang Li, Qiang Chen

    2017 IEEE Conference on Antenna Measurements and Applications, CAMA 2017 2018- 400-402 2018/01/29

    DOI: 10.1109/CAMA.2017.8273464  

    ISSN: 2474-1760

  159. A Broadband Reflectarray Antenna Using Dual-Resonance PhaseDelay-Line Unit Cell

    Sen Liu, Qiang Chen

    2018/01

  160. Underwater LF wave propagation study for positioning

    Hiroshi Yoshida, Ryotaro Suga, Koichi Uesaka, Masaharu Takahashi, Nozomu Ishii, Qiang Chen, Naomichi Fuji, Hiroyasu Sato

    OCEANS 2017 - Aberdeen 2017-October 1-5 2017/10/25

    DOI: 10.1109/OCEANSE.2017.8084829  

  161. Efficiency improvement with a recursive taylor expansion of bessel functions for layered media Green's function Peer-reviewed

    Keisuke Konno, Qiang Chen, Robert J. Burkholder

    2017 IEEE Antennas and Propagation Society International Symposium, Proceedings 2017- 1355-1356 2017/10/18

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI: 10.1109/APUSNCURSINRSM.2017.8072720  

  162. Scattering performance of a reflectarray using log-periodic dipole array element

    Keisuke Konno, Hiroyasu Sato, Qiang Chen, Hiroki Itoh

    2017 International Symposium on Antennas and Propagation (ISAP) 2017/10

    Publisher: IEEE

    DOI: 10.1109/isanp.2017.8228841  

  163. Numerical Analysis of Large-Scale Finite Periodic Arrays Using a Macro Block-Characteristic Basis Function Method Peer-reviewed

    Keisuke Konno, Qiang Chen, Robert J. Burkholder

    IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 65 (10) 5348-5355 2017/10

    DOI: 10.1109/TAP.2017.2736526  

    ISSN: 0018-926X

    eISSN: 1558-2221

  164. Novel reflected beam switching method using meta-surface loaded with active elements

    T. Maruyama, T. Shimano, Q. Chen, S. Kameda, N. Suematsu

    2017 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC) 2017/09

    Publisher: IEEE

    DOI: 10.1109/apwc.2017.8062306  

  165. Recent Technologies in Japan on Array Antennas for Wireless Systems Peer-reviewed

    Jiro Hirokawa, Qiang Chen, Mitoshi Fujimoto, Ryo Yamaguchi

    IEICE TRANSACTIONS ON COMMUNICATIONS E100B (9) 1644-1652 2017/09

    DOI: 10.1587/transcom.2016PFI0007  

    ISSN: 0916-8516

    eISSN: 1745-1345

  166. Experiment study of transmission characteristics through conducting human body equivalent liquid Peer-reviewed

    Yang Li, Hiroyasu Sato, Qiang Chen

    IEICE Communications Express 6 (6) 286-291 2017/02

    DOI: 10.1587/comex.2016SPL0025  

  167. FDTD analysis of capsule dipole antenna in the digestive system of a human body Peer-reviewed

    Yang Li, Hiroyasu Sato, Qiang Chen

    IEICE Communications Express 6 (6) 276-280 2017/02

    DOI: 10.1587/comex.2016SPL0023  

  168. Numerical analysis on near field wireless power transfer system using reconfigurable transmitting/receiving antenna Peer-reviewed

    Shun Maruyama, Qiang Chen, Qiaowei Yuan

    IEICE Communications Express 6 (6) 304-308 2017/02

    DOI: 10.1587/comex.2016SPL0028  

    ISSN: 2187-0136

  169. Continuous beam scanning performance of dipole array antenna coupled to meander two-wire parallel transmission line

    Keisuke Konno, Takashi Sekiguchi, Hiroyasu Sato, Qiang Chen

    IEICE Communications Express 6 (8) 490-495 2017

    Publisher: Institute of Electronics, Information and Communications Engineers (IEICE)

    DOI: 10.1587/comex.2017xbl0071  

    eISSN: 2187-0136

    More details Close

    <p>A mechanical beam scanning dipole array antenna coupled to a meander two-wire parallel transmission line is proposed. A meander transmission line is introduced to the proposed antenna in order to suppress its grating lobe without using lumped element inductors. Numerical simulation demonstrates that the proposed antenna is capable of continuous beam scanning ranging from 2°(@ϕ = 0) to 42°(@ϕ = 180°) without grating lobe due to the meander transmission line.</p>

  170. Novel Design of Pixelated Charging Electrodes for Capacitive Power Transfer Peer-reviewed

    Yun-Tseng Liu, Ching-Lieh Li, Yu-Jen Chi, Yang-Han Lee, Qiaowei Yuan, Qiang Chen

    2017 IEEE WIRELESS POWER TRANSFER CONFERENCE (WPTC 2017) 2017

    ISSN: 2474-0225

  171. Wireless power IoT system using polarization switch antenna as polling protocol for 5G mobile network Peer-reviewed

    Yang-Han Lee, An-Sung Wang, Yu-De Liao, Ting-Wei Lin, Yu-Jen Chi, Ching-Chang Wong, Naoki Shinohara, Qiaowei Yuan, Qiang Chen

    2017 IEEE WIRELESS POWER TRANSFER CONFERENCE (WPTC 2017) 2017

    ISSN: 2474-0225

  172. Wideband Scattering Performance of Reflectarray Using Log-Periodic Dipole Array Peer-reviewed

    Hiroki Ito, Keisuke Konno, Hiroyasu Sato, Qiang Chen

    IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 16 1305-1308 2017

    DOI: 10.1109/LAWP.2016.2633305  

    ISSN: 1536-1225

    eISSN: 1548-5757

  173. Fast Computation of Layered Media Green's Function via Recursive Taylor Expansion Peer-reviewed

    Keisuke Konno, Qiang Chen, Robert J. Burkholder

    IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 16 1048-1051 2017

    DOI: 10.1109/LAWP.2016.2619483  

    ISSN: 1536-1225

    eISSN: 1548-5757

  174. Study on Propagation Loss Through Human Body for Wireless Capsule Application Peer-reviewed

    2017 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP 2017) 2017

  175. Scattering Performance of Log-Periodic Dipole Array Peer-reviewed

    Kei Yokokawa, Keisuke Konno, Qiang Chen

    IEEE Antennas and Wireless Propagation Letters 16 740-743 2017

    DOI: 10.1109/LAWP.2016.2601244  

    ISSN: 1536-1225

  176. Dipole Antenna With Sheath-Cover for Seawater Use Peer-reviewed

    2017 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP 2017) 2017

  177. Reflectarray design for small antenna using meta-surface Peer-reviewed

    T. Maruyama, S. Endo, Q. Chen, S. Kameda, N. Suematsu

    2016 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC) 250-251 2016/11/19

    DOI: 10.1109/APWC.2016.7738169  

  178. Self-interference reduction in full-duplex repeater using realistic MIMO-OFDM signal with end-fire arranged arrays

    Yoshiyuki Yamamoto, Masakuni Tsunezawa, Naoki Honma, Qiang Chen

    2016 International Symposium on Antennas and Propagation (ISAP) 2016/10/24

  179. Design of dual-band reflectarray using geneticalgorithm Peer-reviewed

    T. Maruyama, Q Chen, S. Kameda, N. Suematsu

    2016 International Symposium on Antennas and Propagation (ISAP) 644-645 2016/10/24

  180. Antennas in wireless charging systems Peer-reviewed

    Qiang Chen, Qiaowei Yuan

    Handbook of Antenna Technologies 3 2389-2417 2016/09/15

    Publisher: Springer Singapore

    DOI: 10.1007/978-981-4560-44-3_91  

  181. Enhancing aperture efficiency of reflectarray by accurately evaluating mutual coupling of reflectarray elements Peer-reviewed

    Keisuke Konno, Qiang Chen

    IEICE Communications Express 5 (9) 341-346 2016/09

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/comex.2016XBL0116  

    ISSN: 2187-0136

    More details Close

    In this letter, aperture efficiency of reflectarrays is enhanced using an efficient full-wave method. The full-wave method deals with the effect of real mutual coupling between all reflectarray elements exactly during its design process. Resultant long CPU time is greatly reduced by developing an efficient algorithm which is optimized for the vector supercomputer. Numerical simulation shows that the aperture efficiency of the reflectarrays can be enhanced using the proposed method. The proposed method is computationally efficient and applicable for various design targets.

  182. Estimation of Equivalent Current Distribution of Modulated EM Radiation Source Peer-reviewed

    Bunka Nishina, Qiang Chen

    IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 64 (4) 1334-1341 2016/04

    DOI: 10.1109/TAP.2016.2526080  

    ISSN: 0018-926X

    eISSN: 1558-2221

  183. Linear Programming Phase Feeding Method for Phased-Array Scanning

    Yi ZHANG, Guoqiang ZHAO, Houjun SUN, Mang HE, Qiang CHEN

    IEICE Transactions on Electronics E99.C (7) 892-894 2016

    Publisher: Institute of Electronics, Information and Communications Engineers (IEICE)

    DOI: 10.1587/transele.e99.c.892  

    ISSN: 0916-8524

    eISSN: 1745-1353

    More details Close

    Digital phase shifters are widely used to achieve space scanning in phased array antenna, and beam pointing accuracy depends on the bit number and resolution of the digital phase shifter. This paper proposes a novel phase feeding method to reduce the phase quantization error effects. A linear formula for the beam pointing deviation of a linear uniform array in condition of phase quantization error is derived, and the linear programming algorithm is introduced to achieve the minimum beam pointing deviation. Simulations are based on the pattern of the phased array, which gives each element a certain quantization phase error to find the beam pointing deviation. The novel method is then compared with previous methods. Examples show that a 32-element uniform linear array with 5-bit phase shifters using the proposed method can achieve a higher beam-steering accuracy than the same array with 11-bit phase shifters.

  184. Closely Located RFID Tag Antennas on High Dielectric Objects Peer-reviewed

    Kuan-hua Chen, Qiang Chen, Kunio Sawaya

    2016 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP) 998-999 2016

  185. Ray Tracing Analysis of Asymptotic Capacity Based on TCM Peer-reviewed

    Minori Sasaki, Naoki Honma, Keisuke Konno, Qiang Chen, Yoshitaka Tsunekawa

    2016 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP) 244-245 2016

  186. Numerical Analysis of Finite Periodic Array Antenna Using Novel Characteristic Basis Function Method Peer-reviewed

    Keisuke Konno, Qiang Chen, Robert J. Burkholder

    2016 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM 49-50 2016

    ISSN: 1522-3965

  187. FDTD Analysis of Capsule Dipole Antenna In Digestive System of Human Body Peer-reviewed

    Yang Li, Hiroyasu Sato, Qiang Chen

    2016 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP) 992-993 2016

  188. Experimental Study of Transmission Factor Through Conducting Human Body Equivalent Liquid Peer-reviewed

    Hiroyasu Sato, Yang Li, Qiang Chen

    2016 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP) 990-991 2016

  189. Ultra wide band frequency selective absorber with asymmetric absorbing performance

    Tao Hong, Qiang Chen, Shuxi Gong

    2015 International Symposium on Antennas and Propagation (ISAP) 2015/11

  190. Improvement in the light outcoupling efficiency of organic light-emitting diodes using a hemispherical lens and a multipatterned one-dimensional photonic crystal fabricated by autocloning Peer-reviewed

    Hiroshi Fujimoto, Masayuki Yahiro, Takayuki Kawashima, Keisuke Konno, Qiang Chen, Kunio Sawaya, Shojiro Kawakami, Chihaya Adachi

    APPLIED PHYSICS EXPRESS 8 (8) 082102-082102 2015/08

    DOI: 10.7567/APEX.8.082102  

    ISSN: 1882-0778

    eISSN: 1882-0786

  191. Characteristic Mode理論に基づく小形MIMOアンテナのチャネル容量解析

    佐々木 穂, 石井 知貴, 本間 尚樹, 今野 佳祐, 陳 強, 恒川 佳隆

    電気関係学会東北支部連合大会講演論文集 2015 195-195 2015

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2015.0_195  

  192. Measurement of Dipole Antenna in Deionized Water Peer-reviewed

    Hiroyasu Sato, Yang Li, Qiang Chen

    2015 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP) 2015

  193. Diversity Reception of 920MHz RFID Reader Antenna in Smart-Shelf System Peer-reviewed

    Kuan-hua Chen, Qiang Chen, Kunio Sawaya, Machiko Oouchida, Yoshiaki Hirano

    2015 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP) 2015

  194. Design of Compact Multiband Antenna for Triple-Band Cellular Base Stations Peer-reviewed

    Kazuya Itoh, Keisuke Konno, Qiang Chen, Shingo Inoue

    IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 14 (99) 64-67 2015

    DOI: 10.1109/LAWP.2014.2354057  

    ISSN: 1536-1225

    eISSN: 1548-5757

  195. Beam scanning capability and suppression of endfire radiation of dipole array antennas coupled to two-wire parallel transmission line Peer-reviewed

    K. Konno, K. Takeda, Q. Chen

    IEICE Communications Express 4 (12) 358-362 2015

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/comex.2015XBL0127  

    ISSN: 2187-0136

    More details Close

    In this letter, radiation pattern of a dipole array antenna coupled to a two-wire transmission line is numerically investigated. The effect of array spacing on the main beam direction of the array antenna is shown. In addition, it is shown that the endfire radiation of the array antenna can be suppressed when series inductors are loaded with the two-wire transmission line.

  196. ガラーキンモーメント法によるプリントアンテナ数値解析の高精度化に関する検討 Peer-reviewed

    吉川 幸広, 陳 強, 澤谷 邦男

    電子情報通信学会論文誌 B J98-B (1) 44-52 2015/01

  197. Acceleration of various direct/iterative solvers for MoM by GPU and its computational cost

    Keisuke Konno, Qiang Chen, Hajime Katsuda

    IEEE International Symposium on Electromagnetic Compatibility 2014- 824-827 2014/12/23

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    ISSN: 2158-1118 1077-4076

  198. The Numerical Analysis of an Antenna near a Dielectric Object Using the Higher-Order Characteristic Basis Function Method Combined with a Volume Integral Equation Peer-reviewed

    Keisuke Konno, Qiang Chen

    IEICE TRANSACTIONS ON COMMUNICATIONS E97B (10) 2066-2073 2014/10

    DOI: 10.1587/transcom.E97.B.2066  

    ISSN: 0916-8516

    eISSN: 1745-1345

  199. Antena Design for E/O Sensors of High Sensitivity Peer-reviewed

    阿部 寛人, 陳 強

    電子情報通信学会論文誌 J97-B (3) 263-269 2014/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1344-4697

  200. Dual-band Reflectarray Using Combination of Mushroom-like structure and Dipole Array Peer-reviewed

    T. Maruyama, T. Horikoshi, Q. Chen

    2014 IEEE-APS TOPICAL CONFERENCE ON ANTENNAS AND PROPAGATION IN WIRELESS COMMUNICATIONS (APWC) 361-362 2014

  201. DOA Estimation of Linear Patch Antenna Array Using USV - MUSIC Algorithm Peer-reviewed

    Vira Rahayu, Kei Yokokawa, Qiang Chen, Yono Hadi Pramono

    2014 ASIA-PACIFIC MICROWAVE CONFERENCE (APMC) 122-124 2014

  202. Construction of Equivalent Source for Modulated Electromagnetic Radiation Peer-reviewed

    Bunka Nishina, Qiang Chen, Kunio Sawaya, Qiaowei Yuan

    2014 8TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP) 156-159 2014

    ISSN: 2164-3342

  203. Numerical Analysis of Planar Dipole Antennas in the Vicinity of Dielectric Object Using HO-CBFM Peer-reviewed

    Keisuke Konno, Qiang Chen

    2014 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP) 245-246 2014

  204. Design of Directivity of Tapered Slot Antenna for Triple-Band Cellular Base Stations Peer-reviewed

    Kazuya Itoh, Keisuke Konno, Qiang Chen, Shingo Inoue

    2014 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP) 569-570 2014

  205. Acceleration of Various Direct/Iterative Solvers for MoM by GPU and Its Computational Cost Peer-reviewed

    Keisuke Konno, Qiang Chen, Hajime Katsuda

    2014 INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY, TOKYO (EMC'14/TOKYO) 824-827 2014

    ISSN: 2158-110X

  206. Design of Finite FSS-backed Reflectarray by Using BDP-CG Method Peer-reviewed

    Keisuke Konno, Qiang Chen, Suguru Kameda, Noriharu Suematsu

    2014 INTERNATIONAL WORKSHOP ON ANTENNA TECHNOLOGY: "SMALL ANTENNAS, NOVEL EM STRUCTURES AND MATERIALS, AND APPLICATIONS" (IWAT) 195-197 2014

    DOI: 10.1109/IWAT.2014.6958636  

  207. Antenna Characterization for Wireless Power Transfer Using Near-Field Coupling of Multi-antenna Peer-reviewed

    Qiang Chen, Mingda Wu, Qiaowei Yuan

    PROCEEDINGS OF 2014 3RD ASIA-PACIFIC CONFERENCE ON ANTENNAS AND PROPAGATION (APCAP 2014) 491-494 2014

    DOI: 10.1109/APCAP.2014.6992535  

    ISSN: 2381-5523

  208. Numerical Analysis of Antenna near Dielectric Object by Using CBFM with Arbitrary Block Division Peer-reviewed

    Keisuke Konno, Qiang Chen

    2014 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI) 2112-2113 2014

    DOI: 10.1109/APS.2014.6905383  

    ISSN: 1522-3965

  209. Experimental Study of Improving Wireless Propagation Channel by Using Reflectarray Peer-reviewed

    Qiang Chen

    2014 IEEE INTERNATIONAL WORKSHOP ON ELECTROMAGNETICS (IEEE IWEM): APPLICATIONS AND STUDENT INNOVATION COMPETITION 102-103 2014

    DOI: 10.1109/iWEM.2014.6963656  

  210. Estimation Method for Complex Radiation Pattern of MIMO Antennas Using Backscattering Waves Peer-reviewed

    Masatoshi Saitoh, Qiang Chen, Naoki Honma

    2014 IEEE INTERNATIONAL WORKSHOP ON ELECTROMAGNETICS (IEEE IWEM): APPLICATIONS AND STUDENT INNOVATION COMPETITION 217-218 2014

    DOI: 10.1109/iWEM.2014.6963714  

  211. Galerkin's Moment Method Analysis of Coplanar Printed Dipole Antenna Peer-reviewed

    吉川 幸広, 澤谷 邦男, 陳 強

    電子情報通信学会論文誌 B J96-B (9) 1001-1009 2013/09/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1344-4697

  212. Quantitative study of computing time of direct/iterative solver for MoM by GPU computing Peer-reviewed

    Keisuke Konno, Hajime Katsuda, Kei Yokokawa, Qiang Chen, Kunio Sawaya, Qiaowei Yuan

    IEICE Commun. Express 2 (8) 359-364 2013/08/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/comex.2.359  

    ISSN: 2187-0136

    More details Close

    Guidelines for reduction of computing time of direct/iterative solver for MoM on GPU computing are reviewed. Computing time of the direct/iterative solver with and without these guidelines is compared to show the computational efficiency of GPU computing quantitatively.

  213. Analysis of Near-Field Power Transfer Using Scattering Parameters Peer-reviewed

    Qiaowei Yuan, Mingda Wu, Qiang Chen, Kunio Sawaya

    Proc. of The 7th European Conference on Antennas and Propagation (EUCAP) 3073-3075 2013/04

    ISSN: 2164-3342

  214. Research on Wireless Power Transfer with Near-field coupling using Multi-antenna Peer-reviewed

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan 2013 (0) 112-112 2013

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI: 10.11528/tsjc.2013.0_112  

  215. An X-Band Reflectarray With Novel Elements and Enhanced Bandwidth Peer-reviewed

    Qing-Yong Chen, Shi-Wei Qu, Jian-Feng Li, Qiang Chen, Ming-Yao Xia

    IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 12 317-320 2013

    DOI: 10.1109/LAWP.2013.2249652  

    ISSN: 1536-1225

  216. Recent Research Activities on Antennas in Japan Peer-reviewed

    Qiang Chen, Kunio Sawaya, Koichi Ito

    2013 7TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP) 184-188 2013

    ISSN: 2164-3342

  217. Refiectarray Design by Induced Electromotive Force Method Peer-reviewed

    Keisuke Konno, Qiang Chen, Kunio Sawaya, Suguru Kameda, Noriharu Suematsu

    2013 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI) 1342-+ 2013

    DOI: 10.1109/APS.2013.6711331  

    ISSN: 1522-3965

  218. Evaluation of Inter-cell Interference Suppression Using Tunable Beam-width Microstrip Antenna in Actual Indoor Environment Peer-reviewed

    Masatoshi Saito, Naoki Honma, Tomoki Murakami, Qiang Chen

    2013 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI) 376-+ 2013

    DOI: 10.1109/APS.2013.6710849  

    ISSN: 1522-3965

  219. Measurement of Reflectarray for Improving MIMO Channel Capacity of Outdoor NLOS Radio Channel Peer-reviewed

    Qiang Chen, Jianfeng Li, Yusuke Kurihara, Kunio Sawaya, Qiaowei Yuan, Ngochao Tran, Yasuhiro Oda

    2013 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI) 870-+ 2013

    DOI: 10.1109/APS.2013.6711094  

    ISSN: 1522-3965

  220. Analysis of Near-Field Power Transfer of Multi-Antenna Using Multiport Scattering Parameters Peer-reviewed

    Mingda Wul, Qiang Chen, Qiaowei Yuan

    2013 PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP), VOLS 1 AND 2 2013

  221. Reflectarray Development for Improving NLOS Radio Channel Invited Peer-reviewed

    Qiang Chen

    2013 ASIA-PACIFIC MICROWAVE CONFERENCE PROCEEDINGS (APMC 2013) 654-656 2013

    DOI: 10.1109/APMC.2013.6694895  

  222. Optimization of Block Size for CBFM in MoM Peer-reviewed

    Keisuke Konno, Qiang Chen, Kunio Sawaya, Toshihiro Sezai

    IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 60 (10) 4719-4724 2012/10

    DOI: 10.1109/TAP.2012.2207330  

    ISSN: 0018-926X

  223. Measurement of Digital Terrestrial Television Broadcasting Wave for Indoor Reception and Study on Diversity Reception Peer-reviewed

    武田 優, 陳 強, 澤谷 邦男, 茂木 智広

    電子情報通信学会論文誌 B J95-B (9) 1151-1158 2012/09/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1344-4697

  224. Antenna Characterization for Wireless Power-Transmission System Using Near-Field Coupling Peer-reviewed

    Qiang Chen, Kazuhiro Ozawa, Qiaowei Yuan, Kunio Sawaya

    IEEE ANTENNAS AND PROPAGATION MAGAZINE 54 (4) 108-116 2012/08

    DOI: 10.1109/MAP.2012.6309161  

    ISSN: 1045-9243

  225. A simple asymptotical model for analyzing wire antenna with different radius Peer-reviewed

    Huiqing Zhai, Qiang Chen, Qiaowei Yuan, Kunio Sawaya, Long Li, Changhong Liang

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 54 (4) 960-964 2012/04

    DOI: 10.1002/mop.26689  

    ISSN: 0895-2477

    eISSN: 1098-2760

  226. Optimum Load of WPT System Analyzed by S-Parameters Peer-reviewed

    Qiaowei Yuan, Qiang Chen, Jianfeng Li, Kunio Sawaya

    6th European Conference on Antennas and Propagation (EuCAP 2012) 2012/03

    DOI: 10.1109/EuCAP.2012.6206303  

  227. Multiband antenna for disaster-resilient wireless networks

    Kunio Sawaya, Qiang Chen, Hiroto Abe

    International Symposium on Wireless Personal Multimedia Communications, WPMC 491-492 2012

    ISSN: 1347-6890

  228. Inverted-L reflectarray element with interdigital gap loading structure

    Jianfeng Li, Qiang Chen, Kunio Sawaya, Qiaowei Yuan

    IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) 1389-1392 2012

    ISSN: 1522-3965

  229. Optimum block division in CBFM for fast MoM

    Keisuke Konno, Qiang Chen, Kunio Sawaya

    IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) 910-913 2012

    ISSN: 1522-3965

  230. 小形アンテナの放射特性の数値解析

    阿部 寛人, 陳 強, 澤谷 邦男

    電気関係学会東北支部連合大会講演論文集 2012 49-49 2012

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2012.0_49  

  231. 高速無線通信用人体装着型マルチアンテナ

    坪井 聖, 澤谷 邦男, 陳 強

    電気関係学会東北支部連合大会講演論文集 2012 48-48 2012

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2012.0_48  

  232. Single-layer dual-band reflectarray with single linear polarization Peer-reviewed

    Shi-Wei Qu, Qing-Yong Chen, Jianfeng Li, Qiang Chen, Ming-Yao Xia

    2012 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2012 - Proceedings 4 1616-1618 2012

    DOI: 10.1109/ICMMT.2012.6230353  

  233. A Planar Waveguide Sheet with Switched Open/Short Termination for Smart-Shelf System Peer-reviewed

    Kuan-hua Chen, Qiang Chen, Kunio Sawaya, Machiko Oouchida, Yoshiaki Hirano

    2012 IEEE INTERNATIONAL CONFERENCE ON WIRELESS INFORMATION TECHNOLOGY AND SYSTEMS (ICWITS) 2012

  234. Modulated scattering antenna array in MIMO transmission Invited Peer-reviewed

    Qiang Chen, Lin Wang, Kunio Sawaya, Qiaowei Yuan

    2012 4th International High Speed Intelligent Communication Forum, HSIC 2012, Proceeding 130-133 2012

    DOI: 10.1109/HSIC.2012.6212947  

  235. Experimental Investigation of Elimination Blindness Propagation Channel Using Reflectarray Peer-reviewed

    Qiang Chen, Jianfeng Li, Yusuke Kurihara, Kuan-Hua Chen, Kunio Sawaya, Qiaowei Yuan, Ngochao Tran, Yasuhiro Oda

    2012 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI) 262.5 2012

    DOI: 10.1109/APS.2012.6347942  

    ISSN: 1522-3965

  236. Analysis of Linear Antenna near Dielectric Object by CBFM Peer-reviewed

    Keisuke Konno, Qiang Chen, Kunia Sawaya, Toshihiro Sezai

    2012 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI) 263.3 2012

    DOI: 10.1109/APS.2012.6347939  

    ISSN: 1522-3965

  237. Planar Dual-Antenna System For Blind Spots Elimination in Mobile Communication System Peer-reviewed

    Jianfeng Li, Qiang Chen, Kunio Sawaya, Qiaowei Yuan

    2012 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI) 210.3 2012

    DOI: 10.1109/APS.2012.6349016  

    ISSN: 1522-3965

  238. Carrier frequency drift estimation for high mobility hierarchical-modulated MIMO-OFDM systems Peer-reviewed

    Yang-Han Lee, Jheng-Yao Lin, Yih-Guang Jan, Wen-Ching Li, Jing-Shown Wu, Hen-Wai Tsao, Ming-Hsueh Chuang, Qiang Chen, Qiaowei Yuan

    IEICE ELECTRONICS EXPRESS 8 (21) 1823-1828 2011/11

    DOI: 10.1587/elex.8.1823  

    ISSN: 1349-2543

  239. Hybrid Approach of SPM and Matrix-Inversion to Estimate Current Distribution of High-Oder Mode

    Qiang Chen, Jerdvisanop Chakarothai, Yuan Zhen, Kunio Sawaya

    International Symposium on Antennas and Propagation (ISAP) 2011/10

  240. Optimization of Block Size for CBFM in MoM

    Keisuke Konno, Qiang Chen, Kunio Sawaya, Toshihiro Sezai

    International Symposium on Antennas and Propagation (ISAP) 2011/10

  241. Statistical Analysis of Huge-Scale Periodic Array Antenna Including Randomly Distributed Faulty Elements Peer-reviewed

    Keisuke Konno, Qiang Chen, Kunio Sawaya, Toshihiro Sezai

    IEICE TRANSACTIONS ON ELECTRONICS E94C (10) 1611-1617 2011/10

    DOI: 10.1587/transele.E94.C.1611  

    ISSN: 0916-8524

    eISSN: 1745-1353

  242. Experimental Study on Improving MIMO Channel by Dual-antenna System (DAS) Peer-reviewed

    Lin Wang, Shi-Wei Qu, Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    Proc. International Symposium on Antennas and Propagation (ISAP) 2011/10

  243. Using turbo iterative receiver to mitigate RPI effect in MIMO OFDM communication system Peer-reviewed

    Yang-Han Lee, Yih-Guang Jan, Hsin Huang, Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    IEICE Electronics Express 8 (15) 1240-1244 2011/08

    DOI: 10.1587/elex.8.1240  

  244. Numerical Analysis on MIMO Performance of the Modulated Scattering Antenna Array in Indoor Environment Peer-reviewed

    Lin Wang, Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    IEICE TRANSACTIONS ON COMMUNICATIONS E94B (6) 1752-1756 2011/06

    DOI: 10.1587/transcom.E94.B.1752  

    ISSN: 0916-8516

    eISSN: 1745-1345

  245. Dual-antenna system composed of patch array and planar Yagi-Uda array Peer-reviewed

    Q. Chen, S.-W. Qu, J. Li, L. Wang, Q. Yuan, K. Sawaya

    Proc. the 5th European Conference on Antennas and Propagation (EUCAP) 1023-1026 2011/04

    More details Close

    Reference Type: Conference Proceedings<br /> Record Number: 1388<br /> Author: Q. Chen, S.-W. Qu, J. Li, L. Wang, Q. Yuan and K. Sawaya<br /> Year of Conference: 2011<br /> Title: Dual-antenna system composed of patch array and planar Yagi-Uda array<br /> Conference Name: Proceedings of the 5th European Conference on Antennas and Propagation (EUCAP)<br /> Pages: 1023-1026<br /> Date: 11-15 April 2011<br /> Short Title: Dual-antenna system composed of patch array and planar Yagi-Uda array<br /> Keywords: MIMO communication<br /> Yagi antenna arrays<br /> channel capacity<br /> microstrip antenna arrays<br /> multifrequency antennas<br /> planar antenna arrays<br /> reflector antennas<br /> wireless channels<br /> DAS array<br /> MIMO communications<br /> NLOS<br /> Yagi-Uda antenna array<br /> dual antenna system<br /> folded patch antenna array<br /> non line of sight<br /> numerical analysis<br /> planar antenna array<br /> propagation channel<br /> reflector<br /> wireless communication<br />

  246. Effect of nearby human body on WPT system Peer-reviewed

    Q. Chen, S.-W. Qu, J. Li, L. Wang, Q. Yuan, K. Sawaya

    Proc. the 5th European Conference on Antennas and Propagation (EUCAP) 3983-3986 2011/04

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    Reference Type: Conference Proceedings<br /> Record Number: 1389<br /> Author: Q. Yuan, Q. Chen and K. Sawaya<br /> Year of Conference: 2011<br /> Title: Effect of nearby human body on WPT system<br /> Conference Name: Proceedings of the 5th European Conference on Antennas and Propagation (EUCAP)<br /> Pages: 3983-3986<br /> Date: 11-15 April 2011<br /> Short Title: Effect of nearby human body on WPT system<br /> Keywords: S-parameters<br /> loop antennas<br /> microwave power transmission<br /> receiving antennas<br /> resonance<br /> transmitting antennas<br /> 2-ports lossy network<br /> WPT system<br /> loop element<br /> nearby human body<br /> parasitic helical element<br /> receiving elements<br /> resonant element<br /> transmitting efficiency<br /> transmitting elements

  247. Using LDPC coding and AMC to mitigate received power imbalance in carrier aggregation communication system Peer-reviewed

    Yang-Han Lee, Yih-Guang Jan, Hsin Huang, Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    IEICE ELECTRONICS EXPRESS 8 (8) 618-622 2011/04

    DOI: 10.1587/elex.8.618  

    ISSN: 1349-2543

  248. Measurement of Digital Terrestrial Television Broadcasting Wave for Indoor Reception

    TAKEDA Yu, IKARASHI Kazuhiro, CHEN Qiang, SAWAYA Kunio, SATO Tomoyuki

    ITE Technical Report 35 43-47 2011

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/itetr.35.5.0_43  

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    To design an optimum indoor receiving antenna for digital terrestrial television broadcasting, it is necessary to evaluate radio wave environment of broadcasting wave for indoor reception. In the present report, receivied power of the digital terrestrial broadcasting wave is measured and its distribution is shown in a room. The correlation coefficient between the received powers of two receiving antennas is also evaluated by using the distribution of the received power and assuming two receiving antennas. Finally, the effect of selection diversity reception is obtained by using cumulative distribution function of the received power.

  249. Frequency Selective Reflectarray Using Crossed-Dipole Elements With Square Loops for Wireless Communication Applications Peer-reviewed

    Long Li, Qiang Chen, Qiaowei Yuan, Kunio Sawaya, Tamami Maruyama, Tatsuo Furuno, Shinji Uebayashi

    IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 59 (1) 89-99 2011/01

    DOI: 10.1109/TAP.2010.2090455  

    ISSN: 0018-926X

    eISSN: 1558-2221

  250. Reflectarray element using interdigital gap loading structure Peer-reviewed

    J. F. Li, Q. Chen, Q. W. Yuan, K. Sawaya

    ELECTRONICS LETTERS 47 (2) 83-+ 2011/01

    DOI: 10.1049/el.2010.3083  

    ISSN: 0013-5194

    eISSN: 1350-911X

  251. Dual-antenna system composed of patch array and planar Yagi antenna for elimination of blindness in cellular mobile communications Peer-reviewed

    Shi-Wei Qu, Q. Y. Chen, Q. Chen, J. Li, Q. Yuan, K. Sawaya

    Progress In Electromagnetics Research C 21 87-97 2011

    Publisher: Electromagnetics Academy

    DOI: 10.2528/PIERC11021702  

    ISSN: 1530-9681 1937-8718

  252. Amplitude Controlled Reflectarray Using Non-uniform FSS Reflection Plane Peer-reviewed

    Jianfeng Li, Qiang Chen, Kunio Sawaya, Qiaowei Yuan

    2011 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (APSURSI) 2180-2183 2011

    DOI: 10.1109/APS.2011.5996945  

    ISSN: 1522-3965

  253. Experimental Investigation of MIMO Performance Using Passive Repeater in Multipath Environment Peer-reviewed

    Lin Wang, Shi-Wei Qu, Jianfeng Li, Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 10 752-755 2011

    DOI: 10.1109/LAWP.2011.2162812  

    ISSN: 1536-1225

    eISSN: 1548-5757

  254. Hybrid Approach of SPM and Matrix-Inversion to Estimate Current Distribution of High-Oder Mode Peer-reviewed

    Qiang Chen, Jerdvisanop Chakarothai, Yuan Zhen, Kunio Sawaya

    IEICE Proceeding Series (53) FrP1-53 2011

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.34385/proc.53.FrP1-53  

  255. Hybrid Approach of SPM and Matrix-Inversion to Estimate Current Distribution of Electromagnetic Radiation Source Peer-reviewed

    Qiang Chen, Jerdvisanop Chakarothai, Kunio Sawaya

    2011 IEEE ELECTRICAL DESIGN OF ADVANCED PACKAGING AND SYSTEMS SYMPOSIUM (EDAPS) 2011

    DOI: 10.1109/EDAPS.2011.6213747  

    ISSN: 2151-1225

  256. FSS Sandwiched Reflectarray for Dual–frequency Application Peer-reviewed

    Jianfeng Li, Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    Proc. International Symposium on Antennas and Propagation (ISAP) 2010/11

  257. Application of Impedance Extension Method to 2D Large-scale Periodic Array Antenna with Faulty Elements Peer-reviewed

    Keisuke Konno, Qiang Chen, Kunio Sawaya, Toshihiro Sezai

    Proc. International Symposium on Antennas and Propagation (ISAP) 47 1-4 2010/11

  258. Quantitative Evaluation for Computational Cost of CG-FMM on Typical Wiregrid Models Peer-reviewed

    Keisuke Konno, Qiang Chen, Kunio Sawaya

    IEICE TRANSACTIONS ON COMMUNICATIONS E93B (10) 2611-2618 2010/10

    DOI: 10.1587/transcom.E93.B.2611  

    ISSN: 0916-8516

    eISSN: 1745-1345

  259. Three-Dimensional Electromagnetic Scattering Analysis Using Constrained Interpolation Profile Method Peer-reviewed

    CHAKAROTHAI Jerdvisanop, CHEN Qiang, SAWAYA Kunio

    IEICE Transactions on Communications 93 (10) 2619-2628 2010/10/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1587/transcom.E93.B.2619  

    ISSN: 0916-8516

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    A characteristic-based constrained interpolation profile (CIP) method for solving three-dimensional, time-dependent Maxwell's equations is successfully developed. It is utilized to solve one-dimensional wave equations in the formulation of the Maxwell's equations. Calculation procedure of the CIP method for three-dimensional scattering analysis is described in details. Update equations for boundary conditions of a perfectly conducting (PEC) interface and a dielectric interface are formulated and obtained in explicit forms. Numerical analyses of electromagnetic scatterings of PEC sphere, dielectric sphere and PEC cube are performed and the scattering coefficient is calculated and compared with the Mie's analytic results. As a result, the scattering coefficients show good agreement with the Mie's results, which demonstrates the validity of the CIP method and the formulated update equations. It is also shown that the phase of the scattering coefficients determined by the CIP method are slightly more accurate than that of the FDTD method.

  260. Theoretical and Experimental Investigation of the Modulated Scattering Antenna Array for Mobile Terminal Applications Peer-reviewed

    Mang He, Lin Wang, Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 58 (10) 2589-2597 2010/10

    DOI: 10.1109/TMTT.2010.2063850  

    ISSN: 0018-9480

    eISSN: 1557-9670

  261. Using hopping technique for interference mitigation in Modulated Scattering Array Antenna system Peer-reviewed

    Yang-Han Lee, Yih-Guang Jan, Lin Wang, Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    IEICE ELECTRONICS EXPRESS 7 (12) 839-843 2010/06

    DOI: 10.1587/elex.7.839  

    ISSN: 1349-2543

  262. Dual-antenna system composed of patch array and open-ended waveguide for eliminating blindness of wireless communications Peer-reviewed

    Qiang Chen, Qiaowei Yuan, Shi-Wei Qu, Kunio Sawaya

    IEICE ELECTRONICS EXPRESS 7 (9) 647-651 2010/05

    DOI: 10.1587/elex.7.647  

    ISSN: 1349-2543

  263. Diversity performance of Modulated Scattering Antenna Array with switched reflector Peer-reviewed

    Lin Wang, Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    IEICE ELECTRONICS EXPRESS 7 (10) 728-731 2010/05

    DOI: 10.1587/elex.7.728  

    ISSN: 1349-2543

  264. Numerical Analysis on Transmission Efficiency of Evanescent Resonant Coupling Wireless Power Transfer System Peer-reviewed

    Qiaowei Yuan, Qiang Chen, Long Li, Kunio Sawaya

    IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 58 (5) 1751-1758 2010/05

    DOI: 10.1109/TAP.2010.2044321  

    ISSN: 0018-926X

    eISSN: 1558-2221

  265. Experimental Study on MIMO Performance of Modulated Scattering Antenna Array in Indoor Environment Peer-reviewed

    Lin Wang, Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    IEICE TRANSACTIONS ON COMMUNICATIONS E93B (3) 679-684 2010/03

    DOI: 10.1587/transcom.E93.B.679  

    ISSN: 0916-8516

    eISSN: 1745-1345

  266. Dual frequency selective reflectarray for propagation improvement Peer-reviewed

    Tamami Maruyama, Tatsuo Furuno, Tomoyuki Ohya, Yasuhiro Oda, Qiang Chen, Kunio Sawaya

    Final Program and Book of Abstracts - iWAT 2010: 2010 International Workshop on Antenna Technology: Small Antennas, Innovative Structures and Materials PS3.13 2010

    DOI: 10.1109/IWAT.2010.5464764  

  267. Maximum Transmitting Efficiency of Wireless Power Transfer System with Resonant/Non-resonant Transmitting/Receiving Elements Peer-reviewed

    Qiaowei Yuan, Qiang Chen, Kunio Sawaya

    2010 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM 521.6 2010

    ISSN: 1522-3965

  268. Reflectarray Based on Concept of Gradient Refractive Index Peer-reviewed

    Shi-Wei Qu, Jerdvisanop Chakarothai, Qiang Chen, Kunio Sawaya

    2010 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM 524.10 2010

    ISSN: 1522-3965

  269. Reflectarray design based on interdigital gap loading element Peer-reviewed

    Jianfeng Li, Shiwei Qu, Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    2010 IEEE International Conference on Wireless Information Technology and Systems, ICWITS 2010 2010

    DOI: 10.1109/ICWITS.2010.5612266  

  270. Plane-Wave Excited Lens/Reflector Antennas Made of Uniaxially Anisotropic Metamaterials Peer-reviewed

    Shi-Wei Qu, Jian-Feng Li, Qiang Chen, Qiaowei Yuan, Kunio Sawaya, Zhong-Fu Ji

    2010 ASIA-PACIFIC MICROWAVE CONFERENCE 1557-1560 2010

  271. Dual-frequency reflectarray design using sandwiched FSS Peer-reviewed

    Jianfeng Li, Qiang Chen, Shiwei Qu, Qiaowei Yuan, Kunio Sawaya

    2010 ASIA-PACIFIC MICROWAVE CONFERENCE 877-880 2010

  272. Analysis of Huge-Scale Periodic Array Antenna Using Impedance Extension Method Peer-reviewed

    Keisuke Konno, Qiang Chen, Kunio Sawaya, Toshihiro Sezai

    IEICE TRANSACTIONS ON COMMUNICATIONS E92B (12) 3869-3874 2009/12

    DOI: 10.1587/transcom.E92.B.3869  

    ISSN: 0916-8516

    eISSN: 1745-1345

  273. Estimation of Current Distribution on PCB by Near-Field Measurement

    Qiang Chen, Kunio Sawaya

    International Conference on High-Speed Circuits Design [Keynote] 2009/10

  274. Experimental study on MIMO performance of modulated scattering antenna array in indoor environment

    Lin WANG, Qiang CHEN, Qiaowei YUAN, Kunio SAWAYA

    The 12th International Symposium on Wireless Personal Multimedia Communications (WPMC'09) 2009/09

  275. Study of Relation between MIMO Channel Capacity and Direcitivity of Receiving Antenna Peer-reviewed

    Kazuki SAITO, Qiang CHEN, Kunio SAWAYA

    IEICE Trans. J92-B (9) 1373-1380 2009/09/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1344-4697

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    MIMOチャネル容量と受信アンテナ利得の関係の検討<br /> 齋藤 一樹 陳 強 澤谷 邦男 <br /> 電子情報通信学会論文誌 B Vol.J92-B No.9 pp.1373-1380<br /> 発行日: 2009/09/01<br /> Online ISSN: 1881-0209<br /> Print ISSN: 1344-4697<br /> 論文種別: 特集論文 (シミュレーション・解析手法とアンテナ・伝搬技術論文特集)<br /> 専門分野: 無線システム<br /> キーワード: <br /> MIMOチャネル容量, ミリ波帯, アンテナ指向性, <br /> <br /> 本文: PDF(654.8KB) <br /> ------------------------------------------------あらまし: <br /> 利得の異なる4種類の受信アンテナを用い,アンテナの利得と2× 2MIMO (Multi-Input Multi-Output)チャネル容量の関係についてレイトレーシング法を用いた屋内伝搬特性の計算を用いて検討を行っている.合計132点の受信点において二つの受信アンテナの方向をそれぞれ回転させ,チャネル容量を統計的に求めた.また,各場所ごとにMIMOチャネル容量が最大となるようにアンテナ方向を最適化した場合についても解析を行った.その結果,アンテナ方向を任意の方向に向けた場合には

  276. Measurement of Digital Terrestrial Television Broadcasting Wave for Indooe Reception and Study on Diversity Reception Peer-reviewed

    Yu TAKEDA, Qiang CHEN, Kunio SAWAYA, Tomohiro MOGI

    IEICE Trans. J95-B (9) 1151-1158 2009/09/01

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    屋内における地上デジタルテレビジョン放送波の受信電力を測定し,直交する直線偏波の電力分布を示している.また,この測定結果に基づいて,直交する二つの水平ダイポールを用いた指向性ダイバーシチの検討を行い,等利得合成により4.8~8 dBの受信電力の改善が見られること示している.更に,等利得合成指向性ダイバーシチアンテナを二つ設けて,空間ダイバーシチと併用した場合の更なる改善効果を示すとともに,受信電力の相関係数を求め,ダイバーシチ効果との関係を示しており,ダイバーシチ効果と相関係数は同じ傾向を示し,空間ダイバーシチの導入によって受信電力が3~7.3 dB改善されることを示している.

  277. Analysis of Huge-scale Periodic Array Antenna for SSPS Using Impedance Extension Method

    Keisuke Konno, Qiang Chen, Kunio Sawaya, Toshihiro Sezai

    International Symposium on Electromagnetic Compatibility (EMC) 109 (117) 41-46 2009/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    It is important to analyze a huge-scale periodic array antenna which is assumed to be used for power transmission from space solar power systems (SSPS) to estimate radiation property of the array antenna. However, a full-wave analysis of such a huge scale of array antennas requires too long CPU time and too huge computer memory to be practical. In this report, a so called impedance extension method is proposed as a method for approximate analysis of the array antenna. Validity of the proposed method is investigated by analysis of a huge-scale periodic array antenna.

  278. Effect of Human Body on Near-Field Resonant Coupling Wireless Power Transmission System Peer-reviewed

    Q. Yuan, Q. Chen, K. Sawaya

    Proc. International Symposium on EMC 21Q1 2009/07

  279. Ultrawideband Suppression of Ground Bounce Noise in Multilayer PCB Using Locally Embedded Planar Electromagnetic Band-Gap Structures Peer-reviewed

    Long Li, Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 8 740-743 2009

    DOI: 10.1109/LAWP.2008.2009363  

    ISSN: 1536-1225

  280. A Simple Strip Model in the Volume-Surface Integral Equation for Analysis of Arbitrary Probe-Fed Conformal Microstrip Antennas Invited Peer-reviewed

    Mang He, Qiang Chen, Qiaowei Yuan, Kunio Sawaya, Xiaowen Xu

    IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 8 530-533 2009

    DOI: 10.1109/LAWP.2009.2018709  

    ISSN: 1536-1225

  281. Novel Broadband Planar Reflectarray With Parasitic Dipoles for Wireless Communication Applications Peer-reviewed

    Long Li, Qiang Chen, Qiaowei Yuan, Kunio Sawaya, Tamami Maruyama, Tatsuo Furuno, Shinji Uebayashi

    IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 8 881-885 2009

    DOI: 10.1109/LAWP.2009.2028298  

    ISSN: 1536-1225

  282. Estimation of Current Distribution by Near-Field Measurement Peer-reviewed

    Qiang Chen, Jerdvisanop Chakarothai, Kunio Sawaya

    CEEM: 2009 5TH ASIA-PACIFIC CONFERENCE ON ENVIRONMENTAL ELECTROMAGNETICS 416-419 2009

    DOI: 10.1109/CEEM.2009.5304690  

  283. Numerical Analysis of Electromagnetic Scattering Using Constrained Interpolation Profile Method Peer-reviewed

    Jerdvisanop Chakarothai, Qiang Chen, Kunio Sawaya

    IEICE Proceeding Series (51) 687-690 2009

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.34385/proc.51.2F1-4  

  284. Current Estimation on Multi-Layer Printed Circuit Board with Lumped Circuits by Near-Field Measurement Peer-reviewed

    Sumito Kato, Qiang Chen, Kunio Sawaya

    IEICE TRANSACTIONS ON COMMUNICATIONS E91B (11) 3788-3791 2008/11

    DOI: 10.1093/ietcom/e91-b.11.3788  

    ISSN: 0916-8516

    eISSN: 1745-1345

  285. Microstrip Reflectarray Using Crossed-Dipole with Frequency Selective Surface of Loops Peer-reviewed

    Long Li, Qiang Chen, Qiaowei Yuan, Kunio Sawaya, Tamami Maruyama, Tatsuo Furuno, Shinji Uebayashi

    2008 International Symposium on Antennas and Propagation (ISAP 2008) 45-48 2008/10

  286. Numerical Analysis on Efficient Evanescent Resonant Coupling Wireless Power transmission System Invited Peer-reviewed

    Q. Yuan, Q. Chen, L. Li, K. Sawaya

    2008 International Symposium on Antennas and Propagation (ISAP 2008) 979-982 2008/10

  287. Galerkin's Moment Method Analysis for Dielectric Scatterers : Single Integral Expressions of Mutual Impedance between Sinusoidal Monopole Blocks with Consideration of End Point Charges Invited Peer-reviewed

    CHEN Qiang, ZHAI Huiqing, YUAN Qiaowei, SAWAYA Kunio

    The IEICE transactions on communications B 91 (9) 926-939 2008/09/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1344-4697

  288. Gain Imbalance Effects of Array Elements on MIMO Channel Capacity Peer-reviewed

    Takanori Iwaki, Yu Kakinuma, Qiang Chen, Kunio Sawaya

    5th IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS 2008) 2008/08

  289. Fast Measurement of Radiation Efficiency of Mobile Handset Antennas Peer-reviewed

    Toru Mizukami, Qiang Chen, Kunio Sawaya

    5th IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS 2008) 2008/08

  290. Numerical Analysis of Indoor MIMO-SDM Transmission Using Antenna Selection Diversity Peer-reviewed

    Kazuki Saito, Qiang Chen, Kunio Sawaya

    5th IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS 2008) 2008/08

  291. Estimation of Current Distribution on Multilayer Printed Circuit Board by Near-Field Measurement Peer-reviewed

    Qiang Chen, Sumito Kato, Kunio Sawaya

    IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY 50 (2) 399-405 2008/05

    DOI: 10.1109/TEMC.2008.921028  

    ISSN: 0018-9375

  292. Experimental study on MUSIC-based DOA estimation by using universal steering vector Peer-reviewed

    Qiaowei Yuan, Qiang Chen, Kunio Sawaya

    IEICE TRANSACTIONS ON COMMUNICATIONS E91B (5) 1575-1580 2008/05

    DOI: 10.1093/ietcom/e91-b.5.1575  

    ISSN: 0916-8516

    eISSN: 1745-1345

  293. Ultra-Wideband Suppression of Ground Bounce Noise Using Novel Uniplanar Compact Electromagnetic Bandgap Structures Peer-reviewed

    Long Li, Qiang Chen, Kunio Sawaya

    2008 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM, VOLS 1-9 2530-2533 2008

  294. Measurement of MIMO Performance of Modulated Scattering Array Antennas for Mobile Handsets Peer-reviewed

    Qiang Chen, Lin Wang, Takanori Iwaki, Yu Kakinuma, Qiaowei Yuan, Kunio Sawaya

    2008 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM, VOLS 1-9 1950-+ 2008

  295. Analysis of dielectric body by using volume integral equation combined with multi-region iterative method Peer-reviewed

    H. Zhai, Q. Yuan, Q. Chen, K. Sawaya

    Progress In Electromagnetics Research M 5 161-169 2008

    Publisher: Electromagnetics Academy

    DOI: 10.2528/PIERM08113002  

    ISSN: 1098-8963 1937-8726

  296. Surface-wave suppression band gap and plane-wave reflection phase band of mushroomlike photonic band gap structures Peer-reviewed

    Long Li, Qiang Chen, Qiawei Yuan, Changhong Liang, Kunio Sawaya

    JOURNAL OF APPLIED PHYSICS 103 (2) 023513-1-023513-10 2008/01

    DOI: 10.1063/1.2832401  

    ISSN: 0021-8979

    eISSN: 1089-7550

  297. A modified local resonance cavity cell analysis for dual in-phase reflection of EBG structures Peer-reviewed

    Long Li, Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    2008 IEEE INTERNATIONAL WORKSHOP ON ANTENNA TECHNOLOGY: SMALL ANTENNAS AND NOVEL METAMATERIALS, CONFERENCE PROCEEDINGS 426-+ 2008

    DOI: 10.1109/IWAT.2008.4511382  

  298. Modulated scattering array antenna for MIMO applications Peer-reviewed

    Qiang Chen, Lin Wang, Takanori Iwaki, Yu Kakinuma, Qiaowei Yuan, Kunio Sawaya

    IEICE ELECTRONICS EXPRESS 4 (23) 745-749 2007/12

    DOI: 10.1587/elex.4.745  

    ISSN: 1349-2543

  299. Numerical Investigation of Channel Capacity of Indoor MIMO System Peer-reviewed

    Xiao Peng YANG, Qiang CHEN, Kunio SAWAYA

    IEICE Trans. Communications E90-B (9) 2338-2343 2007/09

    Publisher: The Institute of Electronics, Information and Communication Engineers

    DOI: 10.1093/ietcom/e90-b.9.2338  

    ISSN: 0916-8516

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    The effect of wall and indoor scatterers on the indoor multiple input multiple output (MIMO) communication system is investigated by using the hybrid technique of finite difference time domain (FDTD) method and method of moments (MoM). MIMO channel capacity with the wall reflection is investigated with consideration of the eigenvalue of channel covariance matrix, the received power and the effective multipaths of MIMO system. It is found that the stronger side wall reflection can lead to the higher MIMO channel capacity. MIMO system with indoor scatterers is also analyzed and compared with the line of sight (LOS) indoor MIMO system. It is found that the scatterer material has different effect on the received power and the effective multipaths of MIMO system.

  300. Study of Two Bands Characteristics of Mushroom-Like EBG Structures

    Long Li, Qiang Chen, Qiaowei Yuan, Kunio Sawaya, Changhong Liang

    International Symposium on Antennas and Propagation (ISAP) 2007/08

  301. Analysis of Effect of Antenna Position on Indoor MIMO Channel Capacity Peer-reviewed

    Xiao Peng YANG, Qiang CHEN, Kunio SAWAYA

    2007 International Symposium on Antennas and Propagation (ISAP 2007) 1314-1317 2007/08

  302. Study of Two Bands Characteristics of Mushroom-Like EBG Structures Peer-reviewed

    Long Li, Qiang Chen, Qiaowei Yuan, Kunio Sawaya, Changhong Liang

    2007 International Symposium on Antennas and Propagation (ISAP 2007) 1482-1485 2007/08

  303. SAR investigation of array antennas for mobile handsets Peer-reviewed

    Qiang Chen, Yasunori Komukai, Kunio Sawaya

    IEICE TRANSACTIONS ON COMMUNICATIONS E90B (6) 1354-1356 2007/06

    DOI: 10.1093/etcom/e90-b.6.1354  

    ISSN: 0916-8516

    eISSN: 1745-1345

  304. Investigation of wall effect on indoor MIMO channel capacity by using MoM-FDTD hybrid technique Peer-reviewed

    Xiao Peng Yang, Qiang Chen, Kunio Sawaya

    IEICE TRANSACTIONS ON COMMUNICATIONS E90B (5) 1201-1207 2007/05

    DOI: 10.1093/ietcom/e90-b.5.1201  

    ISSN: 0916-8516

    eISSN: 1745-1345

  305. Simultaneous electromagnetic measurement using a parallel modulated probe array Peer-reviewed

    Qiang Chen, Kunio Sawaya, Tomohiro Habu, Ryoichi Hasumi

    IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY 49 (2) 263-269 2007/05

    DOI: 10.1109/TEMC.2007.893330  

    ISSN: 0018-9375

    eISSN: 1558-187X

  306. Diversity performance of modurated scattering array antenna Peer-reviewed

    Qiang Chen, Yoichiro Takeda, Qiaowei Yuan, Kunio Sawaya

    IEICE ELECTRONICS EXPRESS 4 (7) 216-220 2007/04

    DOI: 10.1587/elex.4.216  

    ISSN: 1349-2543

  307. Preconditioners for CG-FMM-FFT implementation in EM analysis of large-scale periodic array antennas Peer-reviewed

    Huiqing Zhai, Qiaowei Yuan, Qiang Chen, Kunio Sawaya

    IEICE TRANSACTIONS ON COMMUNICATIONS E90B (3) 707-710 2007/03

    DOI: 10.1093/ietcom/e90-b.3.707  

    ISSN: 0916-8516

    eISSN: 1745-1345

  308. Effects of wall reflection on indoor MIMO channel capacity Peer-reviewed

    Xiao Peng Yang, Qiang Chen, Kunio Sawaya

    IEICE Transactions on Communications E90-B (3) 704-706 2007

    Publisher: Institute of Electronics, Information and Communication, Engineers, IEICE

    DOI: 10.1093/ietcom/e90-b.3.704  

    ISSN: 1745-1345 0916-8516

  309. Effect of antenna locations on indoor MIMO system Peer-reviewed

    Xiao Peng Yang, Qiang Chen, Kunio Sawaya

    IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 6 165-167 2007

    DOI: 10.1109/LAWP.2007.895281  

    ISSN: 1536-1225

  310. BER performance of W-CDMA reciever using adaptive array antenna technique in indoor LOS/NLOS environments Peer-reviewed

    Q. Yuan, Y. Takeda, K. Oya, Q. Chen, K. Sawaya, E. Kudoh, F. Adachi

    2007 IEEE INTERNATIONAL WORKSHOP ON ANTENNA TECHNOLOGY: SMALL AND SMART ANTENNAS, METAMATERIALS AND APPLICATIONS 219-+ 2007

    DOI: 10.1109/IWAT.2007.370115  

  311. Measurement of diversity performance of modulated scattering array antennas for mobile handsets Peer-reviewed

    Qiang Chen, Yoichro Takeda, Qiaowei Yuan, Kunio Sawaya

    2007 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM, VOLS 1-12 3090-+ 2007

    DOI: 10.1109/APS.2007.4396256  

    ISSN: 1522-3965

  312. A hybrid method to obtain steering vector for MUSIC-based DOA estimation at the presence of mutual coupling and RF channel gain/phase errors Peer-reviewed

    Q. Yuan, Q. Chen, K. Sawaya

    2007 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM, VOLS 1-12 4801-4804 2007

    DOI: 10.1109/APS.2007.4396736  

    ISSN: 1522-3965

  313. Measurement of Current Distribution on Multi-layer Printed Circuit Board Invited Peer-reviewed

    Q. Chen, S. Kato, K. Sawaya

    Proc. 2006 Electrical Design of Advanced Packaging and Systems, EDAPS’06 2006/12

  314. Numerical analysis of wall material effect on indoor MIMO channel capacity Peer-reviewed

    Xiao Peng Yang, Qiang Chen, Kunio Sawaya

    IEICE TRANSACTIONS ON COMMUNICATIONS E89B (10) 2949-2951 2006/10

    DOI: 10.1093/ietcom/e89-b.10.2949  

    ISSN: 0916-8516

    eISSN: 1745-1345

  315. Estimation of Current Distribution on Multi-layer Printed Circuit Board by Near-field Measurement Peer-reviewed

    Qiang Chen, Sumito Kato, Kunio Sawaya

    Proc. ISAP '06 2006/10

  316. Experimental Study of MUSIC-Based DOA Estimation by Using Universal Steering Vector Peer-reviewed

    Qiaowei Yuan, Qiang Chen, Kunio Sawaya

    Proc. ISAP '06 91-B (5) 1575-1580 2006/10

    DOI: 10.1093/ietcom/e91-b.5.1575  

  317. Performance Study of W-CDMA Adaptive Array Antennas

    Yuan Q, Suguro T, Chen Q, Sawaya K, Kudoh E, Adachi F

    IEEE Antennas and Propagation Society International Symposium 2006/07

  318. Performance of adaptive array antenna with arbitrary geometry in the presence of mutual coupling Peer-reviewed

    Qiaowei Yuan, Qiang Chen, Kunio Sawaya

    IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 54 (7) 1991-1996 2006/07

    DOI: 10.1109/TAP.2006.877158  

    ISSN: 0018-926X

    eISSN: 1558-2221

  319. Numerical Analysis of Wall Effect on Indoor MIMO Channel Capacity by Using MoM-FDTD Hybrid Technique Invited Peer-reviewed

    X. P. Yang, Q. Chen, K. Sawaya

    Proc. 2006 IEEE Antennas and Propagation Society International Symposium 2979-2982 2006/07

  320. A Numerical Study on Large-Scale Periodic Array Antenna by FMM and FFT Peer-reviewed

    H. Zhai, Q. Yuan, Q. Chen, K. Sawaya

    Proc. 2006 IEEE Antennas and Propagation Society International Symposium 4035-4038 2006/07

  321. Performance Study of W-CDMA Adaptive Array Antennas Peer-reviewed

    Q. Yuan, T. Suguro, Q. Chen, K. Sawaya, E. Kudoh, F. Adachi

    Proc. 2006 IEEE Antennas and Propagation Society International Symposium 4573-4576 2006/07

  322. Analysis of large-scale periodic array antennas by CG-FFT combined with equivalent sub-array preconditioner Peer-reviewed

    HQ Zhai, Q Chen, QW Yuan, K Sawaya, CH Liang

    IEICE TRANSACTIONS ON COMMUNICATIONS E89B (3) 922-928 2006/03

    DOI: 10.1093/ietcom/e89-b.3.922  

    ISSN: 0916-8516

    eISSN: 1745-1345

  323. Numerical Investigation of Effects of Wall Reflection on Indoor MIMO Channel Capacity

    XiaoPeng YANG, Qiang CHEN, Kunio SAWAYA

    International Symposium on Antennas and Propagation (ISAP) 2006

  324. 携帯無線端末用アダプティブアレーアンテナの研究 Peer-reviewed

    大家 耕平, 武田 洋一郎, 袁 巧微, 陳 強, 澤谷 邦男

    電気関係学会東北支部連合大会講演論文集 2006 (0) 67-67 2006

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2006.0_67  

  325. 8-12 Experimental Evaluation of W-CDMA Adaptive Array Antenna in Indoor Environment Peer-reviewed

    TAKEDA Yoichiro, OYA Kohei, YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio

    PROCEEDINGS OF THE ITE WINTER ANNUAL CONVENTION 2006 (0) _8-12-1_ 2006

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/itewac.2006.0__8-12-1_  

    ISSN: 1343-4357

    More details Close

    In this study, the effect of Indoor environment on the performance of a W-CDMA adaptive array antenna (AAA) for mobile terminals is investigated experimentally. A W-CDMA AAA receiving system for a 4-element array antenna is developed and used to measure the BER performance in indoor experiment. The experimental results have demonstrated the AAA can improve the SIR significantly compared with the single antenna.

  326. MUSIC based DOA finding and polarization estimation using USV with polarization sensitive array antenna Peer-reviewed

    Q. Yuan, Q. Chen, K. Sawaya

    2006 IEEE Radio and Wireless Symposium 339-342 2006/01

  327. Simultaneous EM measurement system using parallel modulated probe array Invited Peer-reviewed

    Qiang Chen, Kunio Sawaya, Tomohiro Habu, Ryoichi Hasumi

    2006 17TH INTERNATIONAL ZURICH SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY, VOLS 1 AND 2 281-+ 2006

  328. East measurement of radiation efficiency of antennas using parallel modulated probe array Peer-reviewed

    Qiang Chen, Tooru Mizukami, Kunio Sawaya, Ikuo Watanabe, Tomohiro Habu, Ryoichi Hasumi

    IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) 1477-1480 2006

    DOI: 10.1109/APS.2006.1710831  

    ISSN: 1522-3965

  329. Modulated scattering array antennas for mobile handsets Peer-reviewed

    Qiaowei Yuan, Masaya Ishizu, Qiang Chen, Kunio Sawaya

    IEICE ELECTRONICS EXPRESS 2 (20) 519-522 2005/10

    DOI: 10.1587/elex.2.519  

    ISSN: 1349-2543

  330. SAR evaluation of 2-element array antennas for mobile handsets Invited Peer-reviewed

    Qiang Chen, Y. Komukai, K. Sawaya

    IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications, 2005 (PIMRC 2005) 4 2616-2621 2005/09

  331. FAST ITERATIVE ALGORITHM FOR MOM ANALYSIS OF LARGE-SCALE 2-D ARRAY ANTENNAS Peer-reviewed

    Qiang Chen, Youmei Omori, Qiaowei Yuan, Kunio Sawaya, Toshihiro Sezai, Yasumasa Hisada

    Proc. of The 2005 International Symposium on Antennas and Propagation 407-410 2005/08

  332. EFFECT OF CONFIGURATION ON PERFORMANCE OF ADAPTIVE ARRAY ANTENNAS FOR MOBILE TERMINALS Peer-reviewed

    Qiaowei Yuan, Qiang Chen, Kunio Sawaya

    Proc. of The 2005 International Symposium on Antennas and Propagation 523-526 2005/08

  333. Convergence of SOR in MoM analysis of array antenna Invited Peer-reviewed

    Q Chen, QW Yuan, K Sawaya

    IEICE TRANSACTIONS ON COMMUNICATIONS E88B (5) 2220-2223 2005/05

    DOI: 10.1093/ietcom/e88-b.5.2220  

    ISSN: 0916-8516

    eISSN: 1745-1345

  334. Accurate DOA estimation using array antenna with arbitrary geometry Peer-reviewed

    QW Yuan, Q Chen, K Sawaya

    IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 53 (4) 1352-1357 2005/04

    DOI: 10.1109/TAP.2005.844409  

    ISSN: 0018-926X

  335. Special section on 2004 international symposium on antennas and propagation Peer-reviewed

    Yoshio Karasawa, Toru Uno, Hiroyuki Arai, Hisato Iwai, Shin-Ichi Ichitsubo, Masahiko Nishimoto, Jiro Hirokawa, Kiyotaka Fujisaki, Hisashi Morishita, Masaharu Takahashi, Hiroshi Shirai, Futoshi Kuroki, Hiroaki Miyashita, Qiang Chen, Mitoshi Fujimoto, Nishimori Kentaro

    IEICE Transactions on Communications E88-B (6) 2229-2229 2005

    Publisher: Institute of Electronics, Information and Communication, Engineers, IEICE

    DOI: 10.1093/ietcom/e88-b.6.2229  

    ISSN: 1745-1345 0916-8516

  336. Simultaneous measurement of radiation pattern by modulated scattering element array Peer-reviewed

    Q Chen, T Watanabe, K Sawaya

    IEEE 2005 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications Proceedings, Vols 1 and 2 366-369 2005

  337. Modulated Scattering Technique Based Method For Measuring Electromagnetic Field Simultaneously Peer-reviewed

    Qiang Chen, Kunio Sawaya

    2004 Korea-Japan AP/EMC/EMT Joint Conference Proceedings (P-EMC-14) 161-164 2004/11

  338. SOR Algorithm for Solving Matrix Equation in MoM Analysis of Periodic Structures Invited Peer-reviewed

    Qiang Chen, Qiaowei Yuanz, Kunio Sawaya

    International Symposium on Antennas and Propagation (ISAP ‘04) 165-168 2004/08

  339. Numerical Simulation for MIMO Wireless Channel by Using Hybrid Method of FDTD and MoM Peer-reviewed

    XiaoPeng Yang, Kenji Yamaguchi, Qiang Chen, Kunio Sawaya

    International Symposium on Antennas and Propagation (ISAP ‘04) 1 313-316 2004/08

  340. Mutual Coupling Effect on Performance of Adaptive Array Antenna Peer-reviewed

    Qiaowei Yuan, Qiang Chen, Kunio Sawaya

    International Symposium on Antennas and Propagation (ISAP ‘04) 625-628 2004/08

  341. Estimation of Current Distribution on Antennas by Near-field Peer-reviewed

    M. Teramoto, M. Hangai, Q. Chen, K. Sawaya

    Proc. 2004 International Symposium on Electromagnetic Compatibility 1 161-164 2004/06

  342. Estimation of EM source Location in Urban Area by Using Ray-tracing Peer-reviewed

    T. Nogami, Q. Chen, K. Sawaya

    Proc. 2004 International Symposium on Electromagnetic Compatibility 1 393-396 2004/06

  343. 反射器付き変調散乱素子を用いた近傍電磁界測定 Peer-reviewed

    Chakarothai Jerdvisanop, 陳 強, 澤谷 邦男

    電気関係学会東北支部連合大会講演論文集 2004 (0) 148-148 2004

    Publisher: 電気関係学会東北支部連合大会実行委員会

    DOI: 10.11528/tsjc.2004.0.148.0  

  344. Numerical analysis method for wireless channel of MIMO system Peer-reviewed

    Q Chen, K Yamaguchi, XP Yang, K Sawaya

    2004 IEEE 15TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, VOLS 1-4, PROCEEDINGS 3008-3012 2004

  345. DOA estimation using array antenna with arbitrary geometry Peer-reviewed

    QW Yuan, Q Chen, K Sawaya

    2004 IEEE 15TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, VOLS 1-4, PROCEEDINGS 945-948 2004

  346. 90°屈曲マイクロストリップ線路からの放射に関する検討 Peer-reviewed

    大久保 寛, 陳 強, 澤谷 邦男, 塩川 孝泰

    電子情報通信学会論文誌 J86-B (8) 1659-1662 2003/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1344-4697

  347. MoM Analysis of Patch Antenna Array Using Fast Algorithm for Solving Matrix Equation Peer-reviewed

    Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    Proc. 2003 IEEE Antennas and Propagation International Symposium 807-810 2003/06

  348. Suppression effect of the emission from printed circuit board using magnetic absorber located along microstrip line Peer-reviewed

    T. Tobana, T. Sasamori, K. Abe, Qiang Chen, K. Sawaya

    2003 IEEE International Symposium on Electromagnetic Compatibility (EMC '03) 2 1248-1251 2003/05

  349. Accurate source model for MoM analysis of linear antennas by using sinusoidal reaction matching technique Peer-reviewed

    Q Chen, QW Yuan, K Sawaya

    IEICE TRANSACTIONS ON COMMUNICATIONS E86B (2) 870-872 2003/02

    ISSN: 0916-8516

    eISSN: 1745-1345

  350. Dual-mode patch antenna with PIN diode switch Peer-reviewed

    Q Chen, M Kurahashi, K Sawaya

    2003 6TH INTERNATIONAL SYMPOSIUM ON ANTENNAS, PROPAGATION AND EM THEORY, PROCEEDINGS 66-69 2003

    DOI: 10.1109/ISAPE.2003.1276629  

  351. Fast iterative algorithm for solving matrix equation in MoM analysis of large-scale array antennas Peer-reviewed

    Q Chen, QW Yuan, K Sawaya

    2003 6TH INTERNATIONAL SYMPOSIUM ON ANTENNAS, PROPAGATION AND EM THEORY, PROCEEDINGS 186-189 2003

    DOI: 10.1109/ISAPE.2003.1276659  

  352. Radiation characteristics of array antennas for mobile handsets Peer-reviewed

    QW Yuan, Q Chen, K Saway

    2003 6TH INTERNATIONAL SYMPOSIUM ON ANTENNAS, PROPAGATION AND EM THEORY, PROCEEDINGS 352-355 2003

    DOI: 10.1109/ISAPE.2003.1276700  

  353. Dual-mode patch antenna switched by PIN diode Peer-reviewed

    Q Chen, M Kurahashi, K Sawaya

    2003 IEEE TOPICAL CONFERENCE ON WIRELESS COMMUNICATION TECHNOLOGY 148-149 2003

    DOI: 10.1109/WCT.2003.1321463  

  354. Estimation of current distribution by near-field measurement Peer-reviewed

    Q Chen, M Hangai, K Sawaya

    ASIA-PACIFIC CONFERENCE ON ENVIRONMENTAL ELECTROMAGNETICS, CEEM'2003, PROCEEDINGS 482-485 2003

    DOI: 10.1109/CEEM.2003.238294  

  355. Fast algorithm for solving matrix equation in MoM analysis of large-scale array antennas Peer-reviewed

    Q Chen, QW Yuan, K Sawaya

    IEICE TRANSACTIONS ON COMMUNICATIONS E85B (11) 2482-2488 2002/11

    ISSN: 0916-8516

    eISSN: 1745-1345

  356. Fast Iterative Algorithm for Solving Matrix Equation in MoM Analysis of Large-scale Array Antennas Peer-reviewed

    Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    Proc. 2002 Int. Symp. Antennas and Propagatation 424-427 2002/11

  357. Frequency-Selective Effects of Surface-Layered Tissues of Head Models Peer-reviewed

    Maxim MINOSIAN, Hiroyasu SATO, Qiang CHEN, Kunio SAWAYA

    Trans. IEICE J85-B (5) 656-663 2002/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1344-4697

  358. FAST ALGORITHM FOR SOLVING MATRIX EQUATION IN MOM ANALYSIS OF ARRAY ANTENNAS Peer-reviewed

    Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    Proc. 2002 China-Japan Joint Meeting on Microwaves (CJMW'2002) 153-156 2002/04

  359. Numerical Analysis of Suppression Effect of Emission from Printed Circuit Board by Using Ferrite Plates Peer-reviewed

    Teruo Tobana, Qiang Chen, Kunio Sawaya, Takayuki Sasamori, Kohshi Abe

    Trans. IEICE, Japan J85-B (2) 250-257 2002/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0916-8516

    More details Close

    The effect of suppressing electromagnetic emission from a printed circuit board (PCB) by using ferrite plates is investigated. The PCB is composed of a stripline terminated with an open, a short or a 50Ω load and an infinite ground plane or finite ground plane. The frequency dependent finite different time domain (FD-FDTD) method is used for the numerical analysis. The calculated results show that a strong suppression effect is achieved when the ferrite plate is located at the position where the magnetic field density is relatively high. In the case of the PCB with the finite ground plane, it is effective to locate another ferrite plate under the ground plane to suppress the radiation from the ground plane of the PCB.

  360. Broadband monopole Yagi-Uda antenna Peer-reviewed

    Y Taguchi, Q Chen, K Sawaya

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS 85 (1) 49-57 2002

    ISSN: 8756-6621

  361. Broadband and low-profile Yagi-Uda antenna composed of inverted-F and inverted-L shaped elements Peer-reviewed

    Y Taguchi, Q Chen, K Sawaya

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS 85 (1) 43-48 2002

    ISSN: 8756-6621

  362. Measuremental and Numerical Evaluation of Suppression Effect of Radiation from Printed Circuit Board Using Magnetic Absorber Peer-reviewed

    Teruo Tobana, Qiang Chen, Kunio Sawaya, Takayuki Sasamori, Kohshi Abe

    Trans. IEICE, Japan J84-B (10) 1898-1900 2001/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1344-4697

  363. Fast Algorithm for Solving Matrix Equation in MoM Analysis of Array Antenna Peer-reviewed

    Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    Proc. 2001 Korea-Japan AP/EMC/EMT Joint Conference 161-164 2001/09

  364. Numerical Techniques for Analysis of EMC Problem Invited Peer-reviewed

    Kunio Sawaya, Qiang Chen

    2001 Asia-Pacific Radio Science Conference (AP-RASC ’01) B6-01 2001/08

  365. Numerical Analysis for Broadband Phased Array of Log-Periodic Dipole Array Antenna Elements Peer-reviewed

    Daegeun Kim, Qiang Chen, Kunio Sawaya

    Proc. 2001 IEEE International Antennas and Propagation Symposium and USNC/URSI National Radio Science Meeting 3 824-827 2001/08

  366. Method of Moment for Dielectric Scatters by Using Block Modeling with Sinusoidal Reaction Matching Technique Peer-reviewed

    Daisuke Koizumi, Qiang Chen, Kunio Sawaya

    Proc. 2001 Progress in Electromagnetics Research Symposium 299-299 2001/07

  367. Galerkin-MoM analysis for dielectric scatters by using sinusoidal reaction technique Peer-reviewed

    Daisuke Koizumi, Qiang Chen, Kunio Sawaya

    IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) 2 526-529 2001

    DOI: 10.1109/APS.2001.959777  

    ISSN: 1522-3965

  368. 2 Elements Array of MS-LPDA Antenna

    KIM Daegeun, CHEN Qiang, SAWAYA Kunio

    ITE Technical Report 24 (55) 7-11 2000/09/22

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/itetr.24.55.0_7  

    ISSN: 1342-6893

    More details Close

    According to the rapid development of technologies and wide spread of users in the mobile telecommunications area, the needs for a small and bradband antenna become indispensable. Also a phased array technology is one of bases for antennas for wireless telecommunications such as the smart antenna which is necessary to provide the seamless and high quality service to as many users as possible. As a first step for the broadband phased array, some characteristics of two element array of a small and broadband MS-LPDA antenna are presented in this report. The mutual coupling and the element pattern are investigated through single-fed equi-E and equi-H-plane arrays. The beam scanning pattern is also studied through two basic structures of the phased array, and it is shown that the side lobe level changes according to the distance between array elements and the frequencies.

  369. Numerical Simulation of Electromagnetic Wave Propagation in Urban Environment by Using Ray Tracing Method

    NOGAMI Toshizo, CHEN Qiang, SAWAYA Kunio, KITAYOSHI Hitoshi

    ITE Technical Report 24 (55) 1-6 2000/09/22

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/itetr.24.55.0_1  

    ISSN: 1342-6893

    More details Close

    Recently the mobile communication systems including cellular systems have become popular and wide spread in our life. Especially in the most urban areas many subscribers have become to use the mobile communications. Therefore, it is required to analyze the wave propagation in the urban area to provide a stable service to users through the mobile communications network. For this purpose, we simulate the electric field distribution of urban areas in which a wave source is surrounded by buildings. As for the simulation method, we use the 3 dimensinal ray tracing and the uniform geometrical theory of diffraction (UTD). Also we compare the numerical result with the experimental one which is achieved from the miniature model of real buildings.

  370. Suppression Effect of the Undesired Emission from Printed Circuit Board with a Microstrip Line Using a Ferrite Invited Peer-reviewed

    Teruo Tobana, Qiang Chen, Kunio Sawaya, Takayuki Sasamori, Kohshi Abe

    Proc. 2000 Int. Symp. Antennas and Propagatation (ISAP) 4 1569-1572 2000/08

  371. FDTD Analysis of Dipole Antenna in Anisotropic Plasma Peer-reviewed

    Qiang Chen, Hiroyasu Sato, Kunio Sawaya

    Proc. 2000 Int. Symp. Antennas and Propagatation 1 121-124 2000/08

  372. 3-Dimmensional Dispersive and Anisotropic PML Absorbing Boundary Condition Peer-reviewed

    Hiroyasu Sato, Qiang Chen, Kunio Sawaya

    Proc. 2000 Int. Symp. Antennas and Propagatation 1 429-432 2000/08

  373. Microstrip log-periodic dipole array antenna Peer-reviewed

    Daegeun Kim, Qiang Chen, Kunio Sawaya

    Proc. 2000 Int. Symp. Antennas and Propagatation 1 165-168 2000/06

  374. Numerical Methods for Analyzing Characteristics of Antennas in the Vicinity of Conducting Scatterers Invited Peer-reviewed

    Kunio Sawaya, Qiang Chen

    Proc. Millennium Conference on Antennas and Propagation (AP-2000) 4P4 2000/04

  375. Broadband Monopole Yagi-Uda Antenna Peer-reviewed

    Yujiro Taguchi, Qiang Chen, Kunio Sawaya

    Trans. IEICE Japan J83-B (1) 56-64 2000/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1344-4697

  376. Broadband and Low-profile Yagi-Uda Antenna Composed of Inverted-F and Inverted-L Shaped Elements Peer-reviewed

    Yujiro Taguchi, Qiang Chen, Kunio Sawaya

    Trans. IEICE Japan J83-B (1) 65-70 2000/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1344-4697

  377. Fixed gap source model for MoM analysis of linear antennas using sinusoidal reaction matching Peer-reviewed

    Q Chen, QW Yuan, K Sawaya

    IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM, VOLS 1-4 1 38-41 2000

  378. Method of Moment for dielectric scatters by using block modeling with Galerkin's method Peer-reviewed

    Y Ofuji, D Koizumi, Q Chen, K Sawaya

    IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM, VOLS 1-4 4 2314-2317 2000

  379. Vectorization techniques for MoM analysis using sinusoidal reaction matching Peer-reviewed

    S Furuya, Q Chen, K Sawaya

    2000 5TH INTERNATIONAL SYMPOSIUM ON ANTENNAS, PROPAGATION AND EM THEORY PROCEEDINGS 235-238 2000

    DOI: 10.1109/ISAPE.2000.894768  

  380. MEASUREMENT OF POWER ABSORPTION BY COST 244 HUMAN HEAD MODEL BY USING PATTERN INTEGRATION METHOD

    Hiroki YOSHIOKA, Qiang CHEN, Kazuhisa IGARI, Kunio SAWAYA

    International Symposium on Electromagnetic Compatibility 1999/05

  381. Measurement Of Power Absorption By Cost 244 Human Head Model By Using Pattern Integration Method Peer-reviewed

    Hiroki Yoshioka, Qiang Chen, Kazuhisa Igari, Kunio Sawaya

    Proc. EMC'99 Tokyo 333-336 1999/05

  382. FDTD Analysis of Power Absorbed by Anisotropic Ferrite Plate located in the Vicinity of a Microstrip Line Peer-reviewed

    Teruo Tobana, Qiang Chen, Kunio Sawaya

    Proc. EMC'99 Tokyo 373-376 1999/05

  383. Radiation efficiency of small loop antennas for pager Peer-reviewed

    Makoto Sasaki, Qiang Chen, Kunio Sawaya

    IEEE Antennas and Propagation Society International Symposium: Wireless Technologies and Information Networks, APS 1999 - Held in conjunction with USNC/URSI National Radio Science Meeting 1 10-13 1999

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI: 10.1109/APS.1999.789056  

  384. Measurement of radiation efficiency of antennas in the vicinity of human head model proposed by COST 244 Peer-reviewed

    Qiang Chen, Hiroki Yoshioka, Kazuhisa Igari, Kunio Sawaya

    IEEE Antennas and Propagation Society International Symposium: Wireless Technologies and Information Networks, APS 1999 - Held in conjunction with USNC/URSI National Radio Science Meeting 2 1118-1121 1999

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI: 10.1109/APS.1999.789509  

  385. Aeronautical low-profile Yagi-Uda antennas Peer-reviewed

    Y Taguchi, Q Chen, K Sawaya

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS 81 (12) 28-36 1998/12

    ISSN: 8756-6621

  386. Measurement and Improvement of Radiation Efficiency of a Loop Antenna Used for Pager Peer-reviewed

    Makoto Sasaki, Qiang Chen, Seizo Nakamura, Kunio Sawaya

    Trans. IEICE J81-B-II (12) 1153-1155 1998/12

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0915-1885

  387. Comparison of Experimental Methods for Measuring Radiation Efficiency of Antennas for Portable Telephone

    Qiang Chen, Hiroki Yoshika, Kazuhisa Igari, Kunio Sawaya

    IEEE Antennas and Propagation Society International Symposium and USNC/URSI Meeting 1998

  388. A New Type of PIFA Built in Portable Telephone to Alleviate the Absorption of Human Body Peer-reviewed

    Qiao Wei YUAN, Chang Hong LIANG, Qiang CHEN, Kunio SAWAYA

    Chinese Journal of Electronics 7 (1) 18-23 1998/01

  389. Comparison of experimental methods for measuring radiation efficiency of antennas for portable telephone Peer-reviewed

    Q Chen, H Yoshioka, K Igari, K Sawaya

    IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM - ANTENNAS: GATEWAYS TO THE GLOBAL NETWORK, VOLS 1-4 1 149-152 1998

  390. Aeronautical Low-profile Yagi-Uda Antennas Peer-reviewed

    Yujiro Taguchi, Qiang Chen, Kunio Sawaya

    Trans. IEICE Japan J80-B-II (10) 840-847 1997/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0915-1885

  391. Use of the method of moments for analysis of antennas composed of conducting wires and plates Peer-reviewed

    H Ochi, E Yamamoto, Q Chen, K Sawaya

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS 80 (7) 61-69 1997/07

    ISSN: 8756-6621

  392. Measurement of power absorption by human model in the vicinity of antennas Peer-reviewed

    Q Chen, T Shinohe, K Igari, K Sawaya

    IEICE TRANSACTIONS ON COMMUNICATIONS E80B (5) 709-711 1997/05

    ISSN: 0916-8516

    eISSN: 1745-1345

  393. Planar Inverted F Antenna with λ/4 Short Cover for Portable Telephone Peer-reviewed

    Qiang Chen, Qiaowei Yuan, Kunio Sawaya

    Proc. Asia-Pacific Conference on Environmental Electromagnetics 111-114 1996/11

  394. Moment Method Analysis of Antennas Composed of Conducting wires and planes Peer-reviewed

    Hisaaki Ochi, Etsuji Yamamoto, Qiang Chen, Kunio Sawaya

    Trans. IEICE Japan J79-B-II (9) 566-573 1996/09

  395. A New Model of Wire/Surface Junction for Piecewise Sinusoidal Reaction Formulation Peer-reviewed

    Q. Chen, A. Sugawara, H. Ochi, E. Yamamoto, K. Sawaya

    Proc. 1996 Int. Symp. Antennas Propagat., Japan 1165-1168 1996/09

  396. Guard-Ring Coupled Birdcage Resonator for MRI Peer-reviewed

    Qiang Chen, Kunio Sawaya, Saburo Adachi

    Proc. 24th General Assembly of Int. Union of Radio Science, France 659-659 1996/09

  397. Measurement of Radiation Efficiency of Antennas in the Vicinity of Human Model Peer-reviewed

    Qiang Chen, Takayuki Shinohe, Kazuhisa Igari, Kunio Sawaya

    Korea-Japan Joint Conference on Electromagnetic Theory and Compatibility Proc. 99-102 1996/08

  398. A 3-DIMENSIONAL ANALYSIS OF SLOTTED TUBE RESONATOR FOR MRI Peer-reviewed

    Q Chen, K SAWAYA, T UNO, S ADACHI, H OCHI, E YAMAMOTO

    IEEE TRANSACTIONS ON MEDICAL IMAGING 13 (4) 587-593 1994/12

    DOI: 10.1109/42.363110  

    ISSN: 0278-0062

  399. Numerical Analysis of MRI Slotted Tube Resonator Loaded by a Dielectric Body Peer-reviewed

    Qiang Chen, Kunio Sawaya, Toru Uno, Saburo Adachi, Hisaaki Ochi, Etsuji Yamamoto

    Pro. Int. Symp. Electromagnetic Compatibility, Sendai, Japan 573-574 1994/12

  400. Analysis of MRI Slotted Tube Resonator Loaded by a Dielectric Cylinder Peer-reviewed

    Qiang Chen, Kunio Sawaya, Saburo Adachi, Hisaaki Ochi, Etsuji Yamamoto

    24-th General Assembly of the International Union of Radio Science, Kyoto 690-690 1993/08

  401. ANALYSIS OF MRI SLOTTED TUBE RESONATOR HAVING A SHIELD OF CONDUCTING CIRCULAR-CYLINDER Peer-reviewed

    Q CHEN, K SAWAYA, S ADACHI, H OCHI, E YAMAMOTO

    IEICE TRANSACTIONS ON COMMUNICATIONS E76B (5) 553-560 1993/05

    ISSN: 0916-8516

    eISSN: 1745-1345

  402. Analysis of MRI Slotted Tube Resonator Inside Circular Conducting Cylinder Peer-reviewed

    Qiang Chen, Kunio Sawaya, Saburo Adachi, Hisaaki Ochi, Etsuji Yamamoto

    Proc. Int. Symp. Antennas Propagat. 1 125-128 1992/09

  403. Analysis of Slotted Tube Resonator for MRI Peer-reviewed

    Qiang Chen, Kunio Sawaya, Saburo Adachi, Hisaaki Ochi, Etsuji Yamamoto

    Trans. IEICE Japan J75-B-II (8) 602-605 1992/08

    Publisher:

    ISSN: 0915-1885

Show all ︎Show first 5

Misc. 301

  1. Design of Endfire Reectarrays Using Linear Elements

    青木稜吾, 今野佳祐, CHEN Qiang, CHAKAROTHAI Jerdvisanop, 藤井勝巳, 村上靖宜

    電子情報通信学会大会講演論文集(CD-ROM) 2022 2022

    ISSN: 1349-144X

  2. Scattering Performance of Endfire Reflectarray With Linear Monopole Elements

    青木稜吾, 今野佳祐, CHEN Qiang, CHAKAROTHAI Jerdvisanop, 藤井勝巳, 村上靖宜

    電子情報通信学会技術研究報告(Web) 122 (214(AP2022 93-146)) 2022

    ISSN: 2432-6380

  3. 誘電体スラブ装荷によるパッチアンテナの放射に関する研究

    小野佑希菜, 今野佳祐, 陳強

    電気関係学会東北支部連合大会講演論文集(CD-ROM) 2022 2022

  4. 東北大学グリーンネストICT 電波の伝搬環境を改善するためのリフレクトアレー技術

    陳強

    電波技術協会報FORN (342) 2021

    ISSN: 0910-593X

  5. Domestic Trends in Research and Points on Underwater Electromagnetic Field Applications

    石井望, 高橋応明, CHEN Qiang, 吉田弘

    電子情報通信学会大会講演論文集(CD-ROM) 2021 2021

    ISSN: 1349-144X

  6. Electromagnetic wave propagation in the sea and at the sea surface

    高橋応明, 石井望, CHEN Qiang, 吉田弘

    電子情報通信学会大会講演論文集(CD-ROM) 2021 2021

    ISSN: 1349-144X

  7. Design of UHF RFID Tag Antenna for Implanted Denture

    XU Junyi, 佐藤弘康, 本良瑞樹, 末松憲治, 安井一仁, CHEN Qiang

    電子情報通信学会技術研究報告 119 (120(AP2019 21-46)(Web)) 2019

    ISSN: 0913-5685

  8. Self-Interference Suppression of Receiving Antenna Array Integrated with 180 Degree Hybrid Circuits for MIMO Full-Duplex System

    117 (436) 63-66 2018/02/15

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  9. Study on the Wireless Power Transfer System Using the 5G New Radio Access Technology

    Yang-Han Lee, Yu-De Liao, Ting-Wei Lin, Yi-Lun Chen, Wen-Han Jhang, Ching-Chang Wong, Qiaowei Yuan, Naoki Shinohara, Qiang Chen

    3rd Asian Wireless Power Transfer Workshop 2017 2017/12

  10. Numerical Study of Transmission Efficiency between Antennas in Seawater

    藤井 直道, 佐藤 弘康, 陳 強, 石井 望, 高橋 応明, 吉田 弘, 菅 良太郎

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 117 (318) 33-37 2017/11/21

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  11. Experimental Evaluation of Self-Interference Suppression Method Using 180 Degree Hybrid Circuit in MIMO Full-Duplex System

    117 (181) 75-80 2017/08/24

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  12. 6.78MHz-band rectifier with impedance matching circuit considering intrinsic ohmic loss

    117 (157) 15-18 2017/07/27

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  13. 6.78MHz-band rectifier with impedance matching circuit considering intrinsic ohmic loss

    117 (158) 15-18 2017/07/27

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  14. 6.78MHz-band rectifier with impedance matching circuit considering intrinsic ohmic loss

    2017 (104) 15-18 2017/07/27

    Publisher: 電気学会

  15. Study of Near-Field Wireless Power Transfer System Using Reconfigurable Antenna

    117 (15) 5-8 2017/04/28

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  16. Study of Near-Field Wireless Power Transfer System Using Reconfigurable Antenna

    117 (16) 5-8 2017/04/28

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  17. Approach to undersea position estimation

    116 (526) 59-62 2017/03/16

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  18. Self-interference Suppression Using End-Fire Arranged Linear Arrays and 180-Degree Hybrids for Full-Duplex System

    116 (526) 69-74 2017/03/16

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  19. A Design of Composite Dual-band High Gain Antenna with Fresnel Lens Inserted in EBG Surface (アンテナ・伝播)

    Wu Sirao, Sato Hiroyasu, Chen Qiang, Li Long

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 116 (454) 39-42 2017/02/16

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  20. Pseudo Scale Model for Electromagnetic Fields Produced by Infinitesimal Electric and Magnetic Dipoles in Seawater

    116 (345) 11-16 2016/12/08

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  21. Design of Directivity of Dipole Array Antenna Coupled to Two-Wire Parallel Transmission Line

    116 (345) 1-6 2016/12/08

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  22. Adaptive Polarization Switchable Rectenna Adjusted by Microwave Power

    Yu-Jen Chi, Yang-Han Lee, Qiaowei Yuan, Naoki Shinohara, Qiang Chen

    2nd Asian Wireless Power Transfer Workshop 2016/12

  23. An Estimation Method for Finding the Hotspot Charging Zone of Wireless Power Transfer via 5G Massive MIMO Network

    Yu-De Liao, Ting-Wei Lin, An-Sung Wang, Ching-Chang Wong, Yang-Han Lee, Qiaowei Yuan, Naoki Shinohara, Qiang Chen

    2nd Asian Wireless Power Transfer Workshop 2016/12

  24. NB-IoT Using Wireless Power Transfer Antenna Array as Polling Protocol

    Ting-Wei Lin, Yu-De Liao, An-Sung Wang, Ching-Chang Wong, Yang-Han Lee, Qiaowei Yuan, Naoki Shinohara, Qiang Chen

    2nd Asian Wireless Power Transfer Workshop 2016/12

  25. Experimental Investigation of Near Field Wireless Power Transfer System by Using Reconfigurable Antenna

    116 (321) 25-29 2016/11/24

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  26. Exploring EM Wave Applications under Sea Water : Concept of Positioning System Using Amplitude Decay

    116 (218) 25-28 2016/09/15

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  27. Design Method of Lossy Impedance Matching Circuit (アンテナ・伝播)

    袁 巧微, 鈴木 暁士, 陳 強

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 116 (218) 97-100 2016/09/15

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  28. Ray tracing Analysis of MIMO Antenna Channel Capacity Based on TCM

    116 (142) 137-142 2016/07/20

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  29. B-1-57 Performance of Dipole Array Antenna Coupled to Two-Wire Parallel Transmission Line with Lossy Inductors

    SEKIGUCHI Takashi, KONNO Keisuke, CHEN Qiang

    Proceedings of the IEICE General Conference 2016 (1) 57-57 2016/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  30. B-1-84 Analysis of dipole antennas in seawater

    Fujii Naomichi, Sato Hiroyasu, Chen Qiang

    Proceedings of the IEICE General Conference 2016 (1) 84-84 2016/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  31. B-1-68 Improved Feeding Structure of Compact Antipodal Tapered Slot Antenna

    Kudo Toshinori, Sato Hiroyasu, Chen Qiang, Inoue Shingo

    Proceedings of the IEICE General Conference 2016 (1) 68-68 2016/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  32. B-1-223 Estimation of Far Field by Near Field Measurement on a Cylindrical Surface with Small Radius

    Asano Shohei, Sawaya Kunio, Chen Qiang, Wang Lin, Kou Tetsu

    Proceedings of the IEICE General Conference 2016 (1) 223-223 2016/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  33. BCS-1-8 Fast Numerical Analysis of Finite Periodic Dipole Array Antenna Embedded in Thin-Stratified Medium Using Novel Characteristic Basis Function Method

    Konno Keisuke, Burkholder Robert J., Chen Qiang

    Proceedings of the IEICE General Conference 2016 (1) "S-73"-"S-74" 2016/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  34. B-21-3 Research on 2.45GHz harvester

    Suzuki S., DeLong B., Yuan Q., Chen Q., Volakis J.

    Proceedings of the IEICE General Conference 2016 (1) 674-674 2016/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  35. BS-1-9 Indoor Experiment of Polarization Switching Diversity Antennas for On-Body Use

    Sato Hiroyasu, Zhu Ewen, Chen Qiang, Sudo Takashi, Ohishi Takafumi, Suzuki Takuji

    Proceedings of the IEICE General Conference 2016 (1) "S-17"-"S-18" 2016/03/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  36. Wideband Reflectarray Using Log-periodic Dipole Array

    115 (450) 21-25 2016/02/18

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  37. B-1-29 A Study for Beam Scanning Capability of Dipole Array Antenna Coupled to Two-Wire Parallel Transmission

    SEKIGUCHI Takashi, TAKEDA Kenta, KONNO Keisuke, CHEN Qiang

    Proceedings of the Society Conference of IEICE 2015 (1) 29-29 2015/08/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

  38. B-1-100 A Study of Wideband Reflectarray Using Log-periodic Dipole Array

    Ito Hiroki, Konno Keisuke, Chen Qiang

    Proceedings of the Society Conference of IEICE 2015 (1) 100-100 2015/08/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

  39. B-1-131 Relationship Between Number of Modes and MIMO Channel Capacity Analyzed by TCM

    SASAKI Minori, HONMA Naoki, KONNO Keisuke, CHEN Qiang, TSUNEKAWA Yoshitaka

    Proceedings of the Society Conference of IEICE 2015 (1) 131-131 2015/08/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

  40. BS-8-8 Wireless power transfer system at 6.78 MHz-band

    Suzuki Satoshi, Maruyama Shun, Nizeki Riri, Yuan Qiaowei, Chen Qiang

    Proceedings of the Society Conference of IEICE 2015 (1) "S-58" 2015/08/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

  41. CS-1-12 Fast Design of Large-Scale Multi-beam Reflectarray Using Vector Supercomputer

    Konno Keisuke, Chen Qiang

    Proceedings of the IEICE General Conference 2015 (1) "S-21"-"S-22" 2015/02/24

    Publisher: The Institute of Electronics, Information and Communication Engineers

  42. B-1-97 A Reflectarray with Performance of Wide Scattering Angle Using Top Loaded Monopole Element

    Ito Hiroki, Yokokawa Kei, Konno Keisuke, Chen Qiang

    Proceedings of the IEICE General Conference 2015 (1) 97-97 2015/02/24

    Publisher: The Institute of Electronics, Information and Communication Engineers

  43. B-4-19 Study of Imaging Method for Modulated EM Radiation

    Nishina Bunka, Chen Qiang

    Proceedings of the IEICE General Conference 2015 (1) 309-309 2015/02/24

    Publisher: The Institute of Electronics, Information and Communication Engineers

  44. B-1-199 Optimizing Feeding Locations Based on Characteristic Mode Analysis of Compact MIMO Antenna

    SASAKI Minori, ISHII Kazuki, HONMA Naoki, KONNO Keisuke, CHEN Qiang, TSUNEKAWA Yoshitaka

    Proceedings of the IEICE General Conference 2015 (1) 199-199 2015/02/24

    Publisher: The Institute of Electronics, Information and Communication Engineers

  45. B-1-159 Relation Between Input Impedance and Near Field Distribution on RFID Reader Antenna

    Chen Kuan-hua, Chen Qiang, Sawaya Kunio, Oouchida Machiko, Hirano Yoshiaki

    Proceedings of the IEICE General Conference 2015 (1) 159-159 2015/02/24

    Publisher: The Institute of Electronics, Information and Communication Engineers

  46. B-21-8 Impedance Matching for Wireless Power Transfer Systems by Parasitic Element Array

    Maruyama Shun, Ojiri Yuki, Chen Qiang, Yuan Qiaowei

    Proceedings of the IEICE General Conference 2015 (1) 609-609 2015/02/24

    Publisher: The Institute of Electronics, Information and Communication Engineers

  47. リフレクトアレーによる電磁環境の制御技術 (特集 新しい電磁波材料技術と電磁環境制御)

    今野 佳祐, 陳 強

    EMC : electro magnetic compatibility : solution technology : 電磁環境工学情報 27 (10) 44-50 2015/02

    Publisher: [科学情報出版]

    ISSN: 0916-2275

  48. A Study of Acceleration of Design Method for Large-Scale, Low-Profile Reflectarray

    KONNO Keisuke, CHEN Qiang

    Technical report of IEICE. LQE 114 (432) 87-91 2015/01/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In this report, a design method for reflectarrays using induced electromotive force (EMF) method is accelerated using a vector supercomputer. A large-scale reflectarray which consists of a few thousand elements is designed by using the method. Finally, the CPU time and computer memory required for the design of the reflectarray is quantitatively evaluated.

  49. Measurement of Complex Radiation Patterns of MIMO Antenna Using Backscattering Waves

    SAITOH Masatoshi, HONMA Naoki, CHEN Qiang

    IEICE technical report. Antennas and propagation 114 (354) 7-12 2014/12/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    The coaxial cables seriously affect the measurement accuracy of the complex radiation patterns of the MIMO antenna due to the scattering and unwanted radiation from the cables. This report presents the measurement method that uses modulated backscattering wave from the antenna under test and estimates its complex radiation patterns without connecting the coaxial cables to it. The proposed measurement was carried out and it is revealed that the proposed method offers the complex radiation pattern measurement with sufficiently high accuracy.

  50. Gain Enhancement of Large-Scale, Low Profile Reflectarray Using Feed Array

    KONNO Keisuke, CHEN Qiang

    IEICE technical report. Antennas and propagation 114 (294) 55-59 2014/11/12

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In this report, a low-profile, large-scale reflectarray with a primary source in the vicinity of the reflectarray is designed. The large-scale reflectarray which consists of a few thousand elements is designed using our proposed method. In our proposed method, the reflectarray is designed by the induced electromotive forced (EMF) method which is accelerated by a vector-parallel supercomputer. Using our proposed method, it is shown that an array feed is a promising technique for the gain enhancement of the low-profile, large-scale reflectarray.

  51. Research on Scattering Performance of Log-periodic Dipole Array

    YOKOKAWA Kei, KONNO Keisuke, CHEN Qiang

    IEICE technical report. Antennas and propagation 114 (294) 51-54 2014/11/12

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Log-Periodic Dipole Array(LPDA) antenna is well known as the one of ultrawideband antennas. In this report, scattering performance of the LPDA is numerically demonstrated. Relationships between structural parameters and the bandwidth of the LPDA element are clarified. Finally, it is shown that the LPDA element is a promising candidate as a wideband reflectarray element.

  52. Efficiency Improvement of Wireless Power Transfer by Using Parasitic Elements

    OJIRI Yuki, MARUYAMA Shun, CHEN Qiang, YUAN Qiaowei

    114 (246) 1-4 2014/10/15

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    We proposed approach to improve power transfer efficiency (PTE) for near field wireless power transfer (WPT) when the PTE is degraded due to the location misalignment of antennas. The termination load of parasitic elements are varied to adjust the input impedance of antennas for re-match the impedance when the location misalignment occurs. It is demonstrated the PTE is increased by varying and selecting the termination status by numerical simulation.

  53. BS-1-1 A Fast Numerical Analysis of Large-Scale Array Antennas Using CBFM

    Konno Keisuke, Chen Qiang

    Proceedings of the Society Conference of IEICE 2014 (1) "S-1"-"S-2" 2014/09/09

    Publisher: The Institute of Electronics, Information and Communication Engineers

  54. BCS-1-8 Development and Performace Evaluation of Renectarray for lmproving Wireless Propagation Channel

    Chen Qiang

    Proceedings of the Society Conference of IEICE 2014 (1) "S-36"-"S-37" 2014/09/09

    Publisher: The Institute of Electronics, Information and Communication Engineers

  55. BI-8-1 A Near-Field WPT System Using Diversity Combination

    Maruyama Shun, Ojiri Yuki, Chen Qiang, Abe Shinji, Yuan Qiaowei

    Proceedings of the Society Conference of IEICE 2014 (1) "SS-57" 2014/09/09

    Publisher: The Institute of Electronics, Information and Communication Engineers

  56. BI-8-6 2MHz 2W-class Wireless Power Drive Mini-4WD

    Abe Shinji, Suzuki Satoshi, Yuan Qiaowei, Ojiri Yuki, Chen Qiang

    Proceedings of the Society Conference of IEICE 2014 (1) "SS-64" 2014/09/09

    Publisher: The Institute of Electronics, Information and Communication Engineers

  57. Fast MoM Analysis of Large-Scale Reflectarray by using Gauss-Seidel Scheme

    Zhang Jiawei, Konno Keisuke, Chen Qiang, Wang Zhiliang

    IEICE technical report. Antennas and propagation 114 (193) 101-103 2014/08/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In this paper, the method of moments (MoM) combined with Gauss-Seidel method is applied to the numerical analysis of a large-scale array antenna with non-uniform sized elements. Numerical analysis shows that the CPU time of the Gauss-Seidel scheme for solving a matrix equation is proportional to the N^2, where N is the number of the array antenna's elements. This method can be extended easily for numerical analysis of a reflectarray.

  58. 2D-DOA Estimation of Patch Antenna Array Using USV-MUSIC Algorithm

    Rahayu Vira, Yokokawa Kei, Chen Qiang, Pramono Yono Hadi

    IEICE technical report. Antennas and propagation 114 (193) 51-54 2014/08/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Universal steering vector (USV) is applied to estimate directional of arrival (DOA) using multiple signal classification (MUSIC) algorithm. The USV that includes effect of mutual coupling can be used in searching peak spectrum directly without compensation of the mutual coupling. The circular patch antenna is used as DOA receiving antenna for estimation of DOA. Comparison between results of the CSV (conventional steering vector) and the USV are presented in this research.

  59. Power Transmission Efficiency of Near-field Power Transfer Using Multi-antennas

    Wu Mingda, Chen Qiang, Yuan Qiaowei

    Technical report of IEICE. SCE 114 (10) 69-73 2014/04/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Power transmission efficiency (PTE) of wireless power transfer (WPT) using near-field coupling of multi-antennas is numerically analyzed by using the scattering parameters after modeling the whole multi-antenna WPT system as a multi-port network. Because the multi-port scattering parameters can easily be measured by using a vector network analyzer and calculated by a full-wave numerical EM analysis, it is convenient to investigate the relationship between the PTE and the geometry of the multi-antenna WPT system, such as the relative position of the transmitting antenna and the receiving antennas, the geometry of antennas and copper loss in the antennas.

  60. Power Transmission Efficiency of Near-field Power Transfer Using Multi-antennas

    Wu Mingda, Chen Qiang, Yuan Qiaowei

    IEICE technical report. Microwaves 114 (11) 69-73 2014/04/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Power transmission efficiency (PTE) of wireless power transfer (WPT) using near-field coupling of multi-antennas is numerically analyzed by using the scattering parameters after modeling the whole multi-antenna WPT system as a multi-port network. Because the multi-port scattering parameters can easily be measured by using a vector network analyzer and calculated by a full-wave numerical EM analysis, it is convenient to investigate the relationship between the PTE and the geometry of the multi-antenna WPT system, such as the relative position of the transmitting antenna and the receiving antennas, the geometry of antennas and copper loss in the antennas.

  61. Hybridization of Periodic Equivalence Principle Algorithm and Equivalence Principle Algorithm for Analysis of Large Finite Antenna Array

    ZHANG Kaizhi, KONNO Keisuke, CHEN Qiang, OUYANG Jun, YANG Feng

    IEICE technical report. Antennas and propagation 113 (487) 19-23 2014/03/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In this paper, one hybridized method, in which the periodic equivalence principle algorithm is combined with the equivalence principle algorithm, is proposed to solve the finite antenna array with large scale. This method based on the domain decomposition method is more efficient than full-wave methods and more accurate than asymptotical methods with periodic Green's function. Moreover, this approach avoids multi-region iterative algorithm. The numerical results will reveal the feasibility of the proposed method.

  62. Design of Reflectarray with Log-periodic Dipole Array Elements

    YOKOKAWA Kei, KONNO Keisuke, CHEN Qiang, KAMEDA Suguru, SUEMATSU Noriharu

    IEICE technical report. Antennas and propagation 113 (487) 1-5 2014/03/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Log-Periodic Dipole Array(LPDA) elements are well known as one of ultrawideband antennas. In this report, a reflectarray with LPDA elements is designed and the bandwidth of the reflectarray is numerically demonstrated. In addition, it is shown that the bandwidth of the reflectarray is affected by number of dipole elements in the LPDA elements.

  63. B-1-208 Diversity Receptions of Waveguide Sheet Terminated with Switching Diodes

    Chen Kuan-hua, Chen Qiang, Sawaya Kunio, Oouchida Machiko, Hirano Yoshiaki

    Proceedings of the IEICE General Conference 2014 (1) 208-208 2014/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  64. B-1-130 A Study of Accuracy of HO-CBFM with Arbitrary Block Division

    Konno Keisuke, Chen Qiang

    Proceedings of the IEICE General Conference 2014 (1) 130-130 2014/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  65. B-1-145 Wideband Reflectarray Composed of Log-periodic Dipole Array Element

    Yokokawa Kei, Konno Keisuke, Chen Qiang, Kameda Suguru, Suematsu Noriharu

    Proceedings of the IEICE General Conference 2014 (1) 145-145 2014/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  66. B-1-238 Estimating Complex Radiation Patterns of MIMO Antenna Using Load Modulation

    SAITOH Masatoshi, HONMA Naoki, CHEN Qiang

    Proceedings of the IEICE General Conference 2014 (1) 238-238 2014/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  67. C-1-20 Solution of Radiation Problem for Large-Scale Antenna Array by Using Updated Periodic Equivalence Principle Algorithm

    Zhang Kaizhi, Konno Keisuke, Chen Qiang, Ouyang Jun, Yang Feng

    Proceedings of the IEICE General Conference 2014 (1) 20-20 2014/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  68. BCI-2-1 Research Activities on Photonics-applied Electromagnetic Measurement

    Chen Qiang

    Proceedings of the IEICE General Conference 2014 (1) "SS-60"-"SS-61" 2014/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  69. B-1-45 A Study of Impedance Matching Technique for Near-Field WPT System

    Ojiri Yuki, Wu Mingda, Chen Qiang, Yuan Qiaowei

    Proceedings of the IEICE General Conference 2014 (1) 45-45 2014/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  70. Numerical Analysis of Antenna in the Vicinity of Dielectric Object by Higher-Order CBFM

    KONNO Keisuke, CHEN Qiang

    IEICE technical report. Microwaves 113 (260) 147-152 2013/10/24

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    CBFM (Characteristic Basis Function Method) is known as one of the fast MoM for analysis of largescale problems. In the CBFM, characteristic basis function (CBF) is obtained in each block and the compressed matrix equation is solved after compression of the original matrix equation by the CBFs. In previous researches, it has been reported that the accuracy of the CBFM can be improved by introducing higher-order CBFM. However, the accuracy and computational complexity of the CBFM with higher-order CBFM has not been quantitatively reported so far. In this report, an antenna in the vicinity of the dielectric object is analyzed by the higher-order CBFM. Computational complexity and accuracy of the higher-order CBFM is evaluated.

  71. High precision numerical analysis of antenna in the vicinity of dielectric body by using CBFM

    Konno Keisuke, Chen Qiang

    Proceedings of the Society Conference of IEICE 2013 (1) 151-151 2013/09/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

  72. THE STUDY OF THE ANTENNA DESIGN FOR E/O SENSORS OF HIGH SENSITIVITY

    Abe Hiroto, Chen Qiang

    Proceedings of the Society Conference of IEICE 2013 (1) 226-226 2013/09/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

  73. A Study of Design Method for Reflectarray by Induced Electromotive Force Method

    KONNO Keisuke, CHEN Qiang, SAWAYA Kunio, KAMEDA Suguru, SUEMATSU Noriharu

    IEICE technical report. Antennas and propagation 112 (491) 1-5 2013/03/14

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    A design method of reflectarray by the induced electromotive force method is proposed. The effect of the angle of incidence from a primary source to a reflect array element is included in the design process of the reflectarray by the proposed method. The CPU time for design of the reflectarray by the proposed method is short because mutual coupling between reflectarray elements is ignored. The reflectarray which consists of a dipole and parasitic dipole element is designed by the proposed method and the performance of the proposed method is shown. In addition, improvement of the gain of the designed reflectarray is carried out.

  74. B-1-50 Measurement of Reflectarray for Improving Wireless Propagation Channel

    Chen Qiang, Li Jianfeng, Kurihara Yusuke, Sawaya Kunio, Tran Ngochao, Oda Yasuhiro

    Proceedings of the IEICE General Conference 2013 (1) 50-50 2013/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  75. B-1-100 Research on Element of Multi-Band Array Antenna for Cellular Base Station

    Itoh Kazuya, Chen Qiang, Sawaya Kunio, Tanaka Ken

    Proceedings of the IEICE General Conference 2013 (1) 100-100 2013/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  76. B-1-138 Design of Linear Element Reflectarray by Using Induced Electromotive Force Method

    Konno Keisuke, Chen Qiang, Sawaya Kunio, Kameda Suguru, Suematsu Noriharu

    Proceedings of the IEICE General Conference 2013 (1) 138-138 2013/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  77. B-1-78 Acceleration of method of moment using MUIti-GPU

    Yokokawa Kei, Yuan Qiaowei, Katsuda Hajime, Konno Keisuke, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2013 (1) 78-78 2013/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  78. B-1-79 A Study of Acceleration of CBFM by Using GPU

    Katsuda Hajime, Konno Keisuke, chen Qiang, sawaya Kunio, Sezai Toshihiro, Yokokawa Kei, Yuan Qiaowei

    Proceedings of the IEICE General Conference 2013 (1) 79-79 2013/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  79. Numerical and Experimental Study on Planar Waveguide Sheet with Switched Open/Short Termination

    CHEN Kuan-hua, CHEN Qiang, SAWAYA Kunio, OOUCHIDA Machiko, HIRANO Yoshiaki

    IEICE technical report. Electromagnetic compatibility 112 (372) 53-56 2013/01/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    A planner waveguide sheet is used to improve the management efficiency of smart-shelf system. Radio frequency identification (RFID) is the protocol used in this system to read the tag which includes information of the goods on the smart-shelf system. The planar waveguide is used as antenna of the RFID reader. In this report, a method of switching diversity is proposed to improve the radiation performance of the RFID reader and the electric field distribution analysis and experiment results are shown.

  80. A Study of Acceleration of Conjugate Gradient Method Using GPU

    KATSUDA Hajime, KONNO Keisuke, CHEN Qiang, SAWAYA Kunio, YOKOKAWA Kei, YUAN Qiaowei, SEZAI Toshihiro

    IEICE technical report. Antennas and propagation 112 (216) 25-29 2012/09/27

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In method of moments (MoM), large computing time consumption is a serious problem for solving a large-scale matrix equation. To overcome this problem, Graphics Processing Units (GPU) have been used for acceleration of matrix equation solver in recent years. In GPU computing, it is assumed that assignment of numerical operation to each processor, memory access scheme by each processor and assignment of numerical operation between CPU and GPU should be optimized for reduction of computing time. In this report, Conjugate Gradient (CG) method is accelerated by optimized GPU and its computing time is quantitatively evaluated.

  81. B-1-209 A Measurement Approach of USV Generation for DOA Estimation

    Hara Yoshiaki, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2012 (1) 209-209 2012/08/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  82. BP-1-5 Fast Method of Moments for Large-scale Electromagnetic Problems

    Chen Qiang, Konno Keisuke, Katsuda Hajime, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2012 (1) "SS-11"-"SS-12" 2012/08/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  83. CS-4-3 Research on acceleration of method of moments using GPU

    Yokokawa Kei, Saito Yuki, Yuan Qiaowei, Sezai Toshihiro, Katsuda Hajime, Konno Keisuke, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2012 (1) "S-51"-"S-52" 2012/08/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  84. Research on Multi-Band Array Antennas for Mobile Phone Base Station

    CHEN Qiang, KIYONO Shinsuke, SAWAYA Kunio, TANAKA Ken

    IEICE technical report. Antennas and propagation 112 (149) 81-84 2012/07/18

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    A tapered slot antenna (TSA) is applied to the antenna for a mobile phone base station, which covers the frequencies of 900MHz, 1.5GHz and 2GHz. In this report, the input impedance of the TSA is analyzed to design the antenna which has the return loss lower than 10dB at the 3 frequency bands. A conducting reflector is designed which is attached with a circularly cylindrical radome to realize the radiation performance such as the front to back ratio and the beam width.

  85. A Study of Accelerated MoM Computation Using GPU

    KATSUDA Hajime, KONNO Keisuke, CHEN Qiang, SAWAYA Kunio, YOKOKAWA Kei, YUAN Qiaowei

    IEICE technical report. Antennas and propagation 112 (79) 25-30 2012/06/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In method of moments (MoM), cost of too much computing time becomes a serious problem for numerical analysis of large-scale antennas. In recent years, Graphics Processing Units (GPU), which is originally used for graphics processing, have been used for acceleration of the MoM computation. However, there has been few reports on allocation of numerical operation to each processor in GPU and algorithm of MoM affect computing time of GPU. In this report, relation among computing time of GPU, allocation of numerical operation to each processor in GPU and algorithm of MoM is quantitatively evaluated.

  86. Dual-Antenna System Using Series-fed Microstrip Antenna and Planar Yagi-Uda Antenna

    LI Jianfeng, CHEN Qiang, SAWAYA Kunio, YUAN Qiaowei

    IEICE technical report. Antennas and propagation 112 (7) 7-10 2012/04/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    A planar dual-antenna system (DAS), composed of series-fed microstrip antenna and planar Yagi-Uda antenna, is proposed for eliminating blind spots in mobile communications system. The planar DAS is developed as a passive reflector in a non-line-of-sight (NLOS) environment. Broad-angle scattering and polarization transition can be realized. Equivalent bi-static radar cross section (BRCS) is used to demonstrate the effectiveness of the DAS in eliminating blind spots and improving the propagation channel under the NLOS environment.

  87. Research on acceleration of Method of Moments using GPU

    YOKOKAWA Kei, SAITOU Yuki, YUAN Qiaowei, SEZAI Toshihiro, KATSUDA Hajime, KONNO Keisuke, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 112 (7) 27-32 2012/04/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    For numerical analysis of large-scale antennas, large CPU time is required for solving linear systems in Method of Moments (MoM). In recent years, GPU (Graphics Processing Unit) has been applied to reduce the CPU time of the MoM. In this report, the CPU time of sweep out method and CGNR (Conjugate Gradient method applied to the Normal equations where the Residu is minimized) method on the GPU is compared with that on the CPU. It is demonstrated quantitatively that the GPU can reduce the CPU time of the MoM.

  88. BI-2-2 Mata-Reflector Development for Improving Wireless Propagation Channel

    Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2012 (1) "SS-65"-"SS-66" 2012/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  89. B-1-173 Acceleration method of moment with the conjugate gradient method using GPU

    Yokokawa Kei, Saito Yuuki, Yuan Qiaowei, Sezai Toshihiro, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2012 (1) 173-173 2012/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  90. Measurement of Diversity Antennas for Digital Terrestrial Television in Indoor Environment

    TAKEDA Yu, CHEN Qiang, SAWAYA Kunio, MOGI Tomohiro

    IEICE technical report. Antennas and propagation 111 (429) 41-46 2012/02/09

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Received power of orthogonal linear polarizations Of the digital terrestrial broadcasting wave is measured in doors to evaluate radio wave environment for indoor reception. Based on the measured data, effect of the polarization diversity combined with equal gain combining is derived and. It is noted that diversity gain of 8.8 to 28.2 dB can be obtained using polarization diversity at CDF (cumulative distribution function) =1%. Furthermore, the space diversity with the selection diversity using two pairs of the polarization diversity antennas with equal gain combining noted above is also discussed showing 3 to 7.3 dB improvement of the received power at CDF=1%.

  91. B-4-27 Location Estimation of Incoherent Electromagnetic Source Using TDNF Method

    Onodera Ryo, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 323-323 2012

    Publisher: The Institute of Electronics, Information and Communication Engineers

  92. Experimental Study on Improving Propagation Performance in Wireless Comminications Using Passive Repeaters

    CHEN Qiang, WANG Lin, QU Shiwei, YUAN Qiaowei, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 111 (288) 85-89 2011/11/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    A passive repeater (PR), which comprises one 4-element folded-patch antenna (FPA) array, one planar Yagi-Uda array, and one power combiner, is fabricated to evaluate its performance in a multipath Multiple-Input Multiple-Output (MIMO) communication system experimentally. The received power and the MIMO channel capacity are extensively measured to illustrate the effectiveness of a 4-unit PR for improving the quality of communication channel in the MIMO environment.

  93. Experimental Study on Improving Propagation Performance in Wireless Communications Using Passive Repeaters

    CHEN Qiang, WANG Lin, QU Shiwei, YUAN Qiaowei, SAWAYA Kunio

    111 (288) 85-89 2011/11/09

  94. Effect of Impedance Matching on Efficiency of Wireless Power Transfer by Near-field Coupled Resonance

    CHEN Qiang, OZAWA Kazuhiro, YUAN Qiaowei, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 111 (231) 31-35 2011/10/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    A fundamental study is focused to investigate the power transmission efficiency of the wireless power transmission system by near-field coupling from a view point of antenna theory. Two types of antennas, dipole and loop antennas, are used as the transmitting antennas and receiving antennas for electrical near-field coupling and for magnetic near-field coupling, respectively. The relation is clarified between the power transmission efficiency and antenna geometry, antenna electrical size, impedance matching of the antennas, and ohmic loss in antennas and impedance matching circuits. Seveal observations have been obtained to demonstrate the influence on the power transmission efficiency from the impedance matching and ohmic loss in the wireless power transmission system by near-field coupling.

  95. B-1-87 Analysis of Antenna Close to Nonuniform Dielectric Object

    Konno Keisuke, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2011 (1) 87-87 2011/08/30

    Publisher: The Institute of Electronics, Information and Communication Engineers

  96. B-1-21 Numerical Analysis of Reflectarray Scattering Characteristics in Actual Environment

    KOBAYASHI Katsuya, CHEN Qiang, SAWAYA Kunio

    Proceedings of the Society Conference of IEICE 2011 (1) 21-21 2011/08/30

    Publisher: The Institute of Electronics, Information and Communication Engineers

  97. B-1-29 Effect of Received Diversity of Terrestrial Digital Wave for Indoor Reception

    Takeda Yu, Chen Qiang, Sawaya Kunio, Sato Tomoyuki

    Proceedings of the Society Conference of IEICE 2011 (1) 29-29 2011/08/30

    Publisher: The Institute of Electronics, Information and Communication Engineers

  98. BS-2-13 Array Calibration Technique Using USV

    Chen Qiang, Yuan Qiaowei, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2011 (1) "S-31"-"S-32" 2011/08/30

    Publisher: The Institute of Electronics, Information and Communication Engineers

  99. Modulated Scattering Technique in EM Measurement and Multi-Antenna Construction

    CHEN Qiang

    IEICE technical report 111 (172) 49-52 2011/07/26

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Based on the modulated scattering technique, reseaches on fast and simutanious EM measurement method, non invasive near-field measurement method, and multi-antenna construction technique have been carried out in Sawaya-Chen Laboratory of Tohoku University. In this talk, outline of these researches is presented, and the performance, effectiveness, and problems of this technique applied to the antennas research are shown and discussed from thearetical and experimental studies.

  100. Estimation of Multi-mode Current Distribution Using Improved SPM Method

    CHAKAROTHAI Jerdvisanop, ZHEN Yuan, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 111 (131) 19-24 2011/07/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    It is important to know the location of electric current sources on printed circuit board in order to suppress the unwanted electromagnetic noises which are radiated from an electronic device. The improved sample pattern matching (SPM) method, proposed by the authors, has been proved to be capable of estimating current sources having phase difference. However, only simple model of two dipole antennas was used as radiating electromagnetic sources. This is far from the practical application in the real world. In this report, the improved SPM method and the combination version of the improved SPM and matrix inversion methods are applied to loop antenna and patch antenna models. The capability of the SPM method in handling practical problems is shown by the estimation of the amplitude and phase of multi-mode electric current sources distributed on the antennas.

  101. Study on MoM combined with CBFM

    KONNO Keisuke, CHEN Qiang, SAWAYA Kunio, SEZAI Toshihiro

    IEICE technical report 111 (29) 1-6 2011/05/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    CBFM (Characteristic Basis Function Method) is known as one of the fast MoM for analysis of large-scale problems. Since CBFM does not include iterative procedure such as CG (Conjugate Gradient) method, CPU time required for CBFM is independent of condition number of Z matrix. So far, it has been found that CPU time required for CBFM depends on number of blocks M. However, relation between number of blocks M and number of segments N, which gives minimum CPU time, has not been reported. In this report, optimum number of blocks M is derived theoretically as a function of N and numerical simulation shows that minimum CPU time for CBFM is realized by the optimum M.

  102. Antenna Design for Near-field Coupled Wireless Power Transmission

    CHEN Qiang, OZAWA Kazuhiro, YUAN Qiaowei, SAWAYA Kunio

    IEICE technical report 111 (29) 21-26 2011/05/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    A fundamental study is focused to investigate the power transmission efficiency of the wireless power transmission system by near-field coupling from a view point of antenna theory. Two types of antennas, dipole and loop antennas, are used as the transmitting antennas and receiving antennas for electrical near-field coupling and for magnetic near-field coupling, respectively. The relation is clarified between the power transmission efficiency and antenna geometry, antenna electrical size, impedance matching of the antennas, and ohmic loss in antennas and impedance matching circuits. Seveal observations have been obtained to demonstrate the influence on the power transmission efficiency from the impedance matching and ohmic loss in the wireless power transmission system by near-field coupling.

  103. B-1-166 Experimental Investigation of MIMO Performance Using Dual-antenna System in Multipath Environment

    Wang Lin, Qu Shiwei, Chen Qiang, Yuan Qiaowei, Sawaya Kunio

    Proceedings of the IEICE General Conference 2011 (1) 166-166 2011/02/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  104. B-1-75 A Study on Fast MoM Based on CBFM

    Konno Keisuke, Chen Qiang, Sawaya Kunio, Sezai Toshihiro

    Proceedings of the IEICE General Conference 2011 (1) 75-75 2011/02/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  105. BS-2-2 Effect of Impedance Matching on Efficiency of Wireless Power Transfer by Near-field Coupled Resonance

    Chen Qiang, Ozawa Kazuhiro, Yuan Qiaowei, Sawaya Kunio

    Proceedings of the IEICE General Conference 2011 (1) "S-21"-"S-22" 2011/02/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  106. Estimation of Current Sources Magnitude Using Improved SPM Method

    ZHEN Yuan, CHAKAROTHAI Jerdvisanop, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 110 (125) 27-31 2010/07/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    To suppress the electromagnetic wave which is leaked from electrical circuits and devices, it is necessary to know the location of current sources. The improved sampled pattern matching (SPM) method was proposed to estimate location of current sources by using near-field distribution. Improved SPM method can estimate the location of current sources with phase difference, but it is invalid to estimate the magnitude of current sources. In this paper, we propose a method for estimating magnitude of current sources by using both improved SPM method and solving the matrix equation with direct inversion method which uses the location of current sources obtained from improved SPM method. The method is verified and compared with the experiment results.

  107. Numerical Evaluation for Computational Cost of CG-FMM on Typical Wiregrid Models

    KONNO Keisuke, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 110 (23) 21-26 2010/05/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    The conjugate gradient-fast multipole method (CG-FMM) is one of the powerful methods for analysis of large-scale electromagnetic problems. It is also known that CPU time and computer memory can be reduced by CG-FMM but such computational cost of CG-FMM depends on shape and electrical properties of an analysis model. In this paper, relation between the number of multipoles and the number of segments in each group is derived from dimension of segment arrangement in four typical wiregrid models. Based on the relation and numerical results for these typical models, the CPU time per iteration and the computer memory are quantitatively discussed. In addition, the number of iteration steps, which is related to condition number of impedance matrix and analysis model, is also considered by a physical point of view.

  108. B-1-170 Dual-Antenna System Composed of Patch Array and Open-Ended Waveguide for Eliminating Blindness of Wireless Communications

    Qu Shi-Wei, Chen Qiang, Yuan Qiaowei, Sawaya Kunio

    Proceedings of the IEICE General Conference 2010 (1) 170-170 2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    In mobile communications in urban area, it is a significant problem that blind spots of in the narrow street are caused by high buildings. In our previous works, a reflectarray antenna was developed to solve the problem. However, the gain of reflectarray becomes very low when a very broad scattering angle is required. In this research, a new dual-antenna system is proposed, including a receiving and a reradiating antenna to realize a broad-angle beam control. An equivalent bistatic radar cross section (BRCS) is deduced to evaluate the antenna performance.

  109. B-1-172 Effect of Block Diagonal Preconditioning in MoM Analysis Using CG Method

    Konno Keisuke, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2010 (1) 172-172 2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  110. B-1-67 Diversity Performance of Modulated Scattering Antenna Array with Switched Reflector

    Wang Lin, He Mang, Chen Qiang, Yuan Qiaowei, Sawaya Kunio

    Proceedings of the IEICE General Conference 2010 (1) 67-67 2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  111. B-4-63 Numerical Analysis of Radio Noise Emitted by Train Model

    Taira Naohiro, Shibata Gaku, Chen Qiang, Sawaya Kunio, Kawasaki Kunihiro, Nakamura Kazuki

    Proceedings of the IEICE General Conference 2010 (1) 413-413 2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  112. B-1-45 Numerical Analysis of Scattering Characteristics of Reflectarray Using Equivalent Sources

    Kobayashi Katsuya, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2010 (1) 45-45 2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  113. B-1-47 Analysis of EM Wave Propagation in Urban City Including Reflectarray Using Ray-Launching Method

    Sakurai Ryo, Chakarothai Jerdvisanop, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2010 (1) 47-47 2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  114. B-1-171 Three-dimensional Analysis of Electromagnetic Scattering of Dielectric Sphere using CIP Method

    Chakarothai Jerdvisanop, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2010 (1) 171-171 2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  115. B-4-73 Experiment of Current Distribution Estimation on Multiple Coherent Sources by Improved SPM Method

    Zhen Yuan, Chakarothai Jerdvisanop, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2010 (1) 423-423 2010/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  116. 変調波源の測定と位置推定についての検討

    武田優, 陳強, 澤谷邦男

    電気関係学会東北支部連合大会講演論文集 2010 2010

  117. B-1-9 Simulation of Space Correlation Coefficient of Indoor Received Power of Digital TV Wave

    Igatashi Kazuhiro, Chen Giang, Sawaya Kunio, Mogi Tomohiro

    Proceedings of the IEICE General Conference 9-9 2010

    Publisher: The Institute of Electronics, Information and Communication Engineers

  118. Analysis of Planar Antenna by CG-FMM

    KONNO Keisuke, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 109 (339) 19-24 2009/12/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    CG-FMM (Conjugate Gradient-Fast Multipole Method) is known as one of the fast Method of Moments(MoM) for large-scale problems. Both CPU time and computer memory for analysis of the CG-FMM are considered to be reduced from O(N^2) to O(N^<1.5>) where N is number of unknowns. However, effect of number of groups, which is one of the important parameters for computational efficiency of the CG-FMM, have not been sufficiently investigated. In this report, versatile program of the CG-FMM is used for analysis of scattering charac-teristics of the planar antenna and the computational efficiency corresponding to number of groups is investigated.

  119. B-4-31 Measurement of Near-Field by Using Modulated Scattering Element with Reflector

    Inoue Shingo, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2009 (1) 314-314 2009/09/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  120. B-4-38 Estimation Method of Far Field Excited by Several Modulated Sources Using Near Field Measurement

    Sayama Toshiki, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2009 (1) 321-321 2009/09/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  121. B-1-42 Maximum Transfer Efficiency of Wireless Power Transfer System

    Yuan Qiaowei, Chen Qiang, Yiwaki Takanori, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2009 (1) 42-42 2009/09/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  122. B-1-71 Dual Frequency and Polarization-independent reflect wave controlling using Crossed-Dipole Reflectarray

    Maruyama Tamami, Furuno Tatsuo, Uebayashi Shinji, Li Long, Chen Qiang, YUEN Qiaowei, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2009 (1) 71-71 2009/09/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

  123. Efficiency Improvement on Wireless Power Transfer System Using Resonant Near-Field Coupling

    YUAN Qiaowei, CHEN Qiang, IWAKI Takanori, OZAWA Kazuhiro, SAWAYA Kunio

    IEICE technical report 109 (183) 47-52 2009/08/27

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    S-parameters which are obtained by the method of moment (MoM) or by the measurement are used to calculate the transmission efficiency of wireless power transmission (WPT) system in this report. In order to obtain the transmission efficiency of WPT system as high as possible, the effects from the load of the receiving element and the conducting loss, the structure of the transmitting antenna and receiving antenna, are investigated in detail by both numerical simulation and experiment. It has been found that if the conducting loss for the electrically small antenna is treated correctly in full-wave based numerical analysis, the calculated transmission efficiencies agree with the measurement ones within a several percent error. Comparing with 2-small loops WPT system, our proposed WPT system can offer stable power to charge the electronic devices in a wider area.

  124. Performance Evaluation of Modulated Scattering Antenna Array

    CHEN Qiang, WANG Lin, YUAN Qiaowei, SAWAYA Kunio

    IEICE technical report 109 (117) 113-118 2009/07/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    The modulated scattering antenna array (MSAA), based on the modulated scattering technique (MST) is composed of one normal antenna element and several modulated scattering elements (MSEs). In this report, the performance of MSAA with various array spacing is measured to investigate the relation between the array spacing and performance of a 2-element MSAA experimentally in the Rayleigh fading environment when the antenna is assumed to be used on a mobile terminal. It is found that both diversity gain and MIMO channel capacity can be improved by reducing array spacing.

  125. A Study of Numerical Analysis of Antennas Using CG-FMM

    KONNO Keisuke, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 109 (35) 1-6 2009/05/14

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Method of moments (MoM) is one of the powerful techniques for numerical analysis of antennas and scatterers. However, CPU time and computer memory, which are proportional to O(N^3) and O(N^2), respectively, increase rapidly when number of segments N increases. In this report, the conjugate gradient (CG) method and the fast multipole method (FMM) are applied to MoM analysis of these large-scale antenna models, and the CPU time and computer memory are investigated.

  126. Fast Measurement of Radiation Efficiency of Antennas Using Parallel Modulated Probe Array

    CHEN Qiang, HE Mang, YUAN Qiaowei, SAWAYA Kunio

    IEICE technical report 109 (35) 47-51 2009/05/14

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    A strip model is incorporated in the volume-surface integral equation (VSIE) to simplify the analysis of the probe-fed conformal microstrip antennas (CMSA) with arbitrary shapes. The thin wire-surface junction of the feeding probe and the patch is transferred to the surface-surface junction that can be modeled by using Rao-Wilton-Glisson (RWG) basis functions easily. Thus, the use of complicated attachment mode basis function in the conventional VSIE is eliminated, which simplifies the calculation of the method of moments (MoM) matrix. The construction of RWG basis functions at the surface-surface junction is detailed as well. An effective remedy is also proposed to overcome the computation breakdown in the near-singularity treatment when the field point locates at the extension of one side of the source domain. Numerical results show the reliability and accuracy of the proposed method.

  127. B-1-27 Measurement of Near-field by using Modulated Scattering Element with Reflector

    Inoue Shingo, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2009 (1) 27-27 2009/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  128. B-1-131 Measurement Method of Electromagnetic Radiation from Incoherent Sources

    Sayama Toshiki, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2009 (1) 131-131 2009/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  129. B-1-48 Human Body Effect on Resonant Near-Field Wireless Power Transmission

    Yuan Qiaowei, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2009 (1) 48-48 2009/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  130. B-1-74 Frequency-selective and Polarization-independent reflect wave control using Crossed-Dipole Loop array (CRDP-LPA)

    Maruyama Tamami, Li Long, Chen Qiang, Yuan Qiaowei, Sawaya Kunio, Furuno Tatsuo, Uebayashi Shinji

    Proceedings of the IEICE General Conference 2009 (1) 74-74 2009/03/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

  131. A Measurement Method Using a Modulated Probe Array for Phase of Electromagnetic Field

    MIZUKAMI Toru, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 108 (475) 95-98 2009/03/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    A measurement method for phase of radiation field using modulated probe array is proposed. Experimental investigation of phase measurement is performed to confirm the validity of the proposed method. It is indicated that the measured phase almost agrees with theoretical data but improvement of the accuracy is required.

  132. 板状ダイポールアンテナの導体損に対するモーメント法解析

    小澤和紘, 陳強, 澤谷邦男

    電気関係学会東北支部連合大会講演論文集 2009 2009

  133. Experimental Investigation of MIMO Transmission Performance with Gain Imbalance of Array Elements

    KAKINUMA Yu, IWAKI Takanori, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 108 (304) 67-71 2008/11/12

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    MIMO is a very important technique which is able to provide high channel capacity in wireless communication system. Recently, MIMO channel characteristics are studied intensively by many experiments and numerical simulations. However, the same type of antenna elements is used as transmitting or receiving antenna elements in most cases. In the past researches, the study about the influence of the gain imbalance between each antenna elements is insufficient. In this paper, the influence of gain imbalance in 2×2 MIMO system is experimentally investigated. The results show that MIMO channel capacity is effected by the ratio of gain and array spacing between each antenna elements.

  134. Numerical analysis of electromagnetic environment of terrestrial digital broadcasting for indoor reception

    INOUE Shingo, CHEN Qiang, SAWAYA Kunio, SAKAUCHI Kouji

    IEICE technical report 108 (241) 1-5 2008/10/09

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    To locate receiving antenna for terrestrial digital broadcasting in the indoor environment and realize the most suitable receiving environment, it is required to design the appropriate setting location and directionality of receiving antenna. Also it is required to examine the electromagnetic environment of terrestrial digital broadcasting in the indoor environment. In this report, the electromagnetic field distribution obtained by numerical analysis of the indoor models with the ray-tracing method, is evaluated and discussed.

  135. Error Evaluation of Estimation of Source Locations by Using Near Field

    INOUE Tomohiro, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 108 (241) 55-59 2008/10/09

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Estimating the source locations of electromagnetic (EM) waves is important for suppressing the emission of unwanted EM waves from electronic devices. To specify the source locations, many estimation methods using near field have been researched. In this paper, the source locations of EM waves are estimated by Sampled Pattern Matching (SPM) method and solving matrix equation. The results of estimations and evaluated errors are reported in this paper.

  136. Transmission Efficiency of Evanescent Resonant Coupling Wireless Power Transfer System with Consideration of Human Body Effect

    YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 108 (201) 95-99 2008/09/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    A more practical wireless transmission system consisting of a larger rectangular wire loop and a small square wire loop with a parasitic square helical coil is proposed for efficient evanescent resonant coupling wireless power transmission system in a office room. The power transmission efficiency is directly defined as the ratio of the receiving power at the receiving element and the input power at the source element and calculated by the full wave solver. The resonant frequency of the system is proposed to be tuned from investigating the input impedance of transmitting element and receiving element as an antenna design usually carries out. The simulation results show the transmission power efficiency can exceed 60% when the proposed system is used to charge only one user, the simulation results also investigate the effects of the position, the number of receiving element and the human body on the power transmission efficiency and the resonant frequency in detail in order to obtain the design guidelines for a practical wireless power system.

  137. Study on Numerical Dispersion Error of Hybrid CIP-FDTD Method

    CHAKAROTHAI Jerdvisanop, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 108 (201) 85-90 2008/09/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Although the contrained interpolation profile (CIP) method has a smaller numerical dispersion when compared with the standard Yee's finite difference time domain (FDTD) algorithm, the electric and magnetic field arrangements of CIP method make it difficult to model antennas into the analysis space. A hybridization of CIP method and FDTD method is proposed to solve the problems of large- or long-distance propagation space including antennas in this paper. The boundary conditions between CIP and FDTD method are also considered and validated. The results show that the numerical dispersion of the hybrid CIP-FDTD method is almost same as that of the CIP method, which is superior to that of the FDTD method.

  138. B-1-183 Experimental Investigation of Influence of Gain Imbalance between Antenna Elements on MIMO Channel Capacity

    Kakinuma Yu, Iwaki Takanori, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2008 (1) 183-183 2008/09/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  139. B-4-71 Error Evaluation of Estimation of Source Locations by Using Near Field

    Inoue Tomohiro, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2008 (1) 312-312 2008/09/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

  140. Simultaneous Switching Noise Suppression in High-Speed Digital System Using Wideband Electromagnetic Bandgap Structure

    LI Long, CHEN Qiang, YUAN Qiaowei, SAWAYA Kunio

    IEICE technical report 108 (148) 119-122 2008/07/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Simultaneous switching noise (SSN) on the power/ground planes is becoming one of the major bottleneck for designing the high speed mix-signal system. In this paper, a new planar electromagnetic bandgap (EBG) structure embedded in power plane is proposed for ultra-wideband SSN suppression in multilayer printed circuit boards (PCBs). The SSN suppression bandwidth is broadened to cover almost the whole noise band. Full-wave simulations and experiments are performed to verify the broadband SSN suppression and high performance.

  141. A Study on Measurement of Permittivity of Liquid Using a Cylindrical Cavity

    KUSHIZAKI Eiki, CHAKAROTHAI Jerdvisanop, CHEN Qiang, SAWAYA Kunio, SUZUKI Makoto

    IEICE technical report 108 (132) 67-70 2008/07/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Method of permittivity of measurement for liquid by using a coaxial probe is often practically used. This method assumes that structure of sample is infinite, so there is no guarantee that the result is correct or not in case there is plenty of sample. Besides, it is needed that sample size should be small. Therefore, in this research, the effect of method of permittivity measurement for liquids by using cylindrical cavity whose volume is small is studied.

  142. B-1-93 Accuracy of CG-FMM for Analysis of an Array Antenna

    Konno Keisuke, Zhai Huiqing, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2008 (1) 93-93 2008/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  143. B-1-220 Numerical Analysis of MIMO Transmission Capacity Using High Directivity Antenna

    Saito Kazuki, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2008 (1) 220-220 2008/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  144. B-1-14 Wireless Power Transfer Efficiency between Helical Coils

    Yuan Qiaowei, Uno Toru, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2008 (1) 14-14 2008/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  145. Estimation of Electromagnetic Source Location in Multipath Environment

    NAKATSU Daisuke, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 107 (431) 87-91 2008/01/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    A novel method to estimate the source location of electromagnetic (EM) waves in a complicated multipath urban areas is developed. The method is based on the multiple signal classification (MUSIC) algorithm and reciprocity of transmitting and receiving antennas. Results are shown to demonstrate the validity of the proposed method. This method can be applied to searching for the location of the illegal radio station in the urban areas.

  146. Electromagnetic Analysis of Antennas Using Fast Multipole Method

    KONNO Keisuke, ZHAI Huiqing, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 107 (431) 111-116 2008/01/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Method of moments (MoM) is one of the efficient methods for numerical electromagnetic analysis of antennas. However, the CPU time and computer memory, which are proportional to O(N^3) and O(N^2), respectively, increase rapidly when number of segments N increases. In this research, the conjugate gradient (CG) method and the fast multipole method (FMM) are applied to MoM to reduce the CPU time and computer memory for numerical analysis of large-scale antennas. Convergence, accuracy and the CPU-time of the method are investigated.

  147. Radiation Efficiency of Lossy Planar Dipole Antenna

    YUAN Qiaowei, UNO Toru, ARIMA Takuji, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 107 (431) 173-178 2008/01/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    The conductivity, the thickness and the surface roughness of conductor have been thought the factors which perhaps affect the radiation efficiency. In this paper, the effects of these factors on antenna radiation efficiency will be investigated by using a lossy planar dipole numerically. In the first part of this paper, a full-wave MoM based on 3-dimensional volume integral equation (VIE-MoM) is used to calculate the radiation efficiency to investigate the effect caused by the conductor thickness. The radiation efficiencies are further compared with those obtained by MoM based on 2-dimensional integral equation where the conductor loss is included in the surface impedance(SI-MoM). It is shown that the radiation efficiency decreases when the conductor becomes thinner. Although the radiation efficiency calculated by the VIE-MoM disagrees with that obtained by SI-MoM for most conductivity and thickness, there are no significant difference between two radiation efficiencies when the conductivity of the conductor approaches to the copper's one. In the second part of this paper, the surface impedance is modified to include the effect of moisture standing in the surface roughness by using transmission line theory. It is found that radiation efficiency is reduced when the conductor is covered with a water layer whose thickness is in order of several μms.

  148. Single Integral Expressions of Self/Mutual Impedance of Volume Sinusoidal Monopoles with Consideration of Endpoint Charges

    ZHAI Huiqing, YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 107 (431) 197-202 2008/01/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In this research, single integral expressions of the mutual impedance between two parallel and perpendicular volume sinusoidal monopoles are derived from the expressions of mutual impedance between wire monopoles, with full consideration of endpoint charges of the monopoles. It is demonstrated that the CPU time for solving single integral expressions is much less than that for solving conventional five-dimensional integral. Good convergence of numerical integration of the self-impedance solved by single integral expression is also shown in some numerical examples.

  149. 変調散乱アンテナ

    陳強

    電子情報通信学会大会講演論文集 2008 2008

    ISSN: 1349-1369

  150. 地上ディジタルテレビ放送波の屋内伝搬環境の解析

    井上真豪, 陳強, 澤谷邦男, 坂内功治

    電気関係学会東北支部連合大会講演論文集 2008 2008

  151. オープンエンディド導波管の放射特性のシミュレーション

    櫻井僚, 陳強, 澤谷邦男

    電気関係学会東北支部連合大会講演論文集 2008 2008

  152. 誘電体損による二層パッチアンテナ放射効率への影響

    佐山稔貴, 陳強, 澤谷邦男, 加藤崇

    電気関係学会東北支部連合大会講演論文集 2008 2008

  153. B-1-170 3 Dimensional Estimation of Source Location in Multipath Environment

    Nakatsu Daisuke, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2007 (1) 170-170 2007/08/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

  154. B-4-41 Estimation of Current Distribution on Patch Antenna by Near-field Measurement

    Kato Sumito, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2007 (1) 304-304 2007/08/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

  155. B-1-183 Experimental Evaluation of W-CDMA Adaptive Array Antenna in Indoor Environment

    Ohya Kouhei, Yuan Quaowei, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2007 (1) 183-183 2007/08/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

  156. Fast Measurement of Radiation Efficiency of Antennas Using Parallel Modulated Probe Array

    CHEN Qiang, MIZUKAMI Toru, SAWAYA Kunio, HABU Tomohiro, HASUMI Ryoichi

    IEICE technical report 107 (144) 107-110 2007/07/19

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    A simultaneous measurement method using parallel modulated probe array is proposed to measure the electromagnetic radiation. The configuration of the measurement system based on the measurement method for measuring radiation efficiency of antennas is described. The performance of the system is demonstrated by the measurement time and some experimental results such as the radiation pattern and the radiation efficiency of measured antennas.

  157. Analysis of Dielectric Body by Using Volume Integral Equation Combined with Multi-region Iterative Method

    ZHAI Huiqing, YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 107 (144) 65-69 2007/07/19

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In this research, electromagnetic analysis of 3-D dielectric body is carried out by using the MoM. The unknown polarization current in dielectric body is expanded into rectangular blocks with overlapping volume sinusoidal functions. To accelerate the matrix-solving CPU time, the whole dielectric volume model is divided into many smaller overlapping volume sub-regions and iterative algorithm, where the overlapping volume sub-region is treated as the iteration unit, is applied to solving the matrix equation in the MoM. Some numerical results are given to show that the CPU time for solving unknown currents can be reduced effectively by multi-region iterative method.

  158. MUSIC-based DOA Estimation by Using Different Steering Vectors

    YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 106 (561) 57-60 2007/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    It has been demonstrated that the MUSIC-based direction of arrical (DOA) estimation can be carried out correctly by using the universal steering vector (USV) even a the presence of the mutual coupling between array elements. In this paper, the relationship between USV and conventional steering vector (CSV) which corresponds to the array factor is described, and moreover the relationship of USV and the practical steering vector or manifold including both the mutual coupling between array elements and the gain/phase errors of RF channels is investigated. The numerical simulation results show that the numerical USV can be obtain very good accuracy for MUSIC-based DOA estimation if the effect only comes from array configuration such as the mutual coupling between array elements and reflector, elements position and so on. The experimental result shows that the steering vector including all effects can estimate DOA correctly and also demonstrates that the practical steering vector can be obtained by multiplying the numerical USV with a DOA-independent compensation matrix.

  159. B-1-69 FDTD Combined with Generalized Pencil-of-Function Method for Efficient Analysis of Electromagnetic Band-Gap Structures

    LI Long, CHEN Qiang, YUAN Qiaowei, SAWAYA Kunio

    Proceedings of the IEICE General Conference 2007 (1) 69-69 2007/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  160. B-1-44 Measurement of Radiation Efficiency of Array Antennas near Human Head

    Mizukami Toru, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2007 (1) 44-44 2007/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  161. B-4-79 Theoretical Analysis of Reflection Coefficient for Complex Permittivity Measurement Using Coaxial Probe

    Kushizaki Eiki, Chen Qiang, Sawaya Kunio, Suzuki Makoto

    Proceedings of the IEICE General Conference 2007 (1) 403-403 2007/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  162. B-1-222 Performance of Receiver Using Frequency-domain Equalization Technique for Single Carrier and Adaptive Array Antenna

    Saito Kazuki, Yuan Qiaowei, Chen Qiang, Sawaya Kunio, Adachi Fumiyuki

    Proceedings of the IEICE General Conference 2007 (1) 222-222 2007/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  163. B-1-223 Effects of Array Spacing on Adaptive Array Antenna in Indoor W-CDMA Communication

    Takeda Yoichiro, Ohya Kohei, Yuan Qiaowei, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2007 (1) 223-223 2007/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  164. B-1-224 Experimental Evaluation of W-CDMA Adaptive Array Antenna in Anechoic Chamber

    Ohya Kouhei, Takeda Yoichiro, Yuan Qiaowei, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2007 (1) 224-224 2007/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  165. Analytical Expressions of Self/Mutual Impedance between Volume Sinusoidal Monopoles

    ZHAI Huiqing, YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 106 (491) 55-60 2007/01/18

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In this research, expressions of the self/mutual impedance between two parallel and perpendicular volume sinusoidal monopoles are derived. Because the expressions include one-dimensional integrations and there is no singularity in the integration, they can be easily and rapidly evaluated numerically. Some numerical results of the mutual impedance are given to demonstrate the accuracy and efficiency of these expressions. These expressions are useful in analysis of antennas including dielectric material by using the volume integral equation method.

  166. Experimental Study on MUSIC-Based DOA Estimation Considering Mutual Coupling and RF Channel Gain/Phase Errors

    YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio

    2006 (18) 83-86 2006/12/15

  167. Numerical Analysis of Channel Capacity of Indoor MIMO System

    CHEN Qiang, YANG Xiao Peng, SAWAYA Kunio

    ITE technical report 30 (49) 5-8 2006/10/03

    Publisher: 映像情報メディア学会

    ISSN: 1342-6893

  168. B-4-52 Measurement of Near-field by Using Modulated Scattering Wireless Probe

    Kajiyama Hiroshi, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2006 (1) 328-328 2006/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  169. B-1-137 Investigation of SAR inside a SAM Phantom in the Vicinity of Array Antenna Mounted on a Portable Handset

    Mizukami Toru, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2006 (1) 137-137 2006/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  170. B-1-198 Experimental Evaluation of Adaptive Array Antenna for W-CDMA Mobile Terminal in Indoor Environment

    Takeda Yoichiro, Oya Kohei, Yuan Qiaowei, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2006 (1) 198-198 2006/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  171. 1項 伝送工学研究会(3節 工学研究会,第5章 国際会議・シンポジウム等)

    澤谷 邦男, 陳 強

    東北大学電気通信研究所研究活動報告 12 271-271 2006/08/01

  172. Accuracy of Analyzing MIMO propagation channel by using Ray Launching Method

    IWAKI Takanori, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 106 (140) 103-107 2006/06/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    The error of the channel capacity in MIMO system caused by the use of ray launching method is described. It is found that the average channel capacity increases as the angle between adjacent rays in the ray launching increases for the case of free space. On the other hand the average capacity obtained by the ray launching method is almost the same to the exact solution when two metal walls are installed in the propagation channel.

  173. Measurement of Electromagnetic Near-field Using High-frequency Modulated Wireless Probe

    KAJIYAMA Hiroshi, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 106 (13) 1-4 2006/04/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Because of the problem that the electromagnetic radiation leaks from the PCB of electric devices, it has become more and more important to measure the near-field of the PCB accurately to estimate the source location of the radiation. In this report, the electromagnetic near-field measurement method using high-frequency modulated wireless probe is proposed. The measurement system is developed and is applied to the measurement of electric field distribution on microstrip line. The measurement results are compared with the numerical results, and validity of experiment is demonstrated.

  174. Analysis of Large-scale Periodic Array Antennas by CG-FFT Combined with Equivalent Sub-array Preconditioner

    ZHAI Huiqing, CHEN Qiang, YUAN Qiaowei, SAWAYA Kunio

    IEICE technical report 106 (13) 5-10 2006/04/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This paper presents a fast and accurate analysis of large-scale periodic array antennas by conjugate-gradient fast Fourier transform (CG-FFT) combined with an equivalent sub-array preconditioner. The impedance matrix can be transformed to a structure of Three-level Block Toeplitz Matrices by using of the periodic structure of array antenna. The Three-level Block Toeplitz Matrices are further transformed to Circulant Matrix, whose multiplication with a vector can be fast implemented by one-dimension (1-D) fast Fourier transform (FFT). Thus, the conjugate-gradient fast Fourier transform (CG-FFT) is successfully applied to the analysis of a large-scale periodic dipole array. Furthermore, an equivalent sub-array preconditioner is proposed to combine with the CG-FFT analysis to reduce iterative steps and the whole CPU-time of the iteration. Some numerical results are given to illustrate the high efficiency and accuracy of the present method.

  175. B-1-39 Fast Numerical Analysis of Large-scale Periodic Array Antenna by FMM

    ZHAI Huiqing, YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio

    Proceedings of the IEICE General Conference 2006 (1) 39-39 2006/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  176. B-1-186 Simultaneous EM Measurement System Using Modulated Probe Array

    Mizukami Tooru, Chen Qiang, Sawaya Kunio, Watanabe Ikuo, Habu Tomohiro

    Proceedings of the IEICE General Conference 2006 (1) 186-186 2006/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  177. B-1-235 Numerical Analysis of Wall Effect on Indoor MIMO Channel Capacity

    YANG XiaoPeng, CHEN Qiang, SAWAYA Kunio

    Proceedings of the IEICE General Conference 2006 (1) 235-235 2006/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  178. B-1-214 Property Evaluation of W-CDMA Adaptive Array Antenna

    Suguro Tomohiro, Yuan Qiaowei, Chen Qiang, Sawaya Kunio, Kudo Eisuke, Adachi Humiyuki

    Proceedings of the IEICE General Conference 2006 (1) 214-214 2006/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  179. 近傍界測定による多層プリント基板上の伝送線路の電流分布の推定

    加藤純人, 陳強, 澤谷邦男

    電気関係学会東北支部連合大会講演論文集 2006 2006

  180. Simultaneous EM Measurement System Using Parallelly Modulated Probe Array

    IEICE technical report 105 (454) 55-58 2005/12/09

    Publisher: 電子情報通信学会

    ISSN: 0913-5685

  181. Investigation of Wall Effect on Indoor MIMO Channel Capacity by Using MoM-FDTD Hybrid Technique

    YANG XiaoPeng, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 105 (355) 35-40 2005/10/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    The wall effects on the indoor MIMO channel capacity are investigated by using the hybrid techniques of the finite difference time domain (FDTD) method and the method of moment (MoM) with consideration of some practical situations, such as the relative location, reflection, and material of the walls. The effective degrees of freedom (EDOF) of multiple paths, the Ricean K-factor, and the received power which are some important parameters to analyze the MIMO channel capacity are also calculated and analyzed according to the wall effects on the indoor MIMO wireless channel.

  182. W-CDMA Receiver with Adaptive 4-Antenna Array

    YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio, KUDOH Eisuke, ADACHI Fumiyuki

    IEICE technical report. Antennas and propagation 105 (355) 89-94 2005/10/13

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    W-CDMA receiver with adaptive 4-element array antenna is developed. The adaptive algorithm is programmed and loaded in DSP which can be changed for the investigation of effects of various adaptive algorithms. The effects of RF circuit, adaptive algorithm and array antenna configuration on the performance of W-CDMA receiving system without fading are investigated.

  183. B-4-36 Estimating Current Distribution of Microstrip Line on Multi-layer Printed Circuit Board by Near Field Measurement

    Takasu Kazuhiro, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2005 (1) 360-360 2005/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  184. B-1-255 Estimation of Source Location in Multipath Envinronment

    Nakatsu Daisuke, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2005 (1) 255-255 2005/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  185. B-1-168 Improvement of Accuracy of Simultaneous EM Field Measurement System by Using Modulated Scattering Element

    Watanabe Takashi, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2005 (1) 168-168 2005/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  186. B-1-204 Synthesized Pattern of Adaptive Array Antennas

    Yuan Qiaowei, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2005 (1) 204-204 2005/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  187. BS-1-1 Diversity Antenna Composed of Modulated Scattering Elements

    Takeda Yoichiro, Yuan Qiaowei, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2005 (1) "S-1"-"S-2" 2005/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  188. Numerical Analysis of UHF Electromagnetic Field within Indoor Environment

    MIZUKAMI Tooru, CHEN Qiang, SAWAYA Kunio, MITSUTAKE Yoshio, HIRATA Katsuhiro

    IEICE technical report. Electromagnetic compatibility 105 (81) 19-22 2005/05/19

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Numerical simulation for evaluating distribution of the electric field in a house model on a steel framework is performed by using the FDTD method. The distribution of the electric field is calculated for various models to investigate effect of wall of the house, position and polarization of the transmitting antenna on the propagation of electromagnetic wave in the indoor environment.

  189. Estimating Current Distribution on Printed Circuit Board by Near Field Measurement

    TAKASU Kazuhiro, TERAMOTO Manabu, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Electromagnetic compatibility 105 (31) 35-40 2005/04/22

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Recently, the electronics device is increasingly digitalized and clock rate increased so electromagnetic wave leaked from electronics device causes in serious interference problems. Therefore, it is required to find the source radiating the unnecessary electromagnetic waves. A method has been proposed to estimate the current distribution on printed circuit board by measuring the near-field. In this paper, experiment and simulation have been performed to estimate current distribution on microstrip line by using the FDTD method to calculate mutual impedance between virtual source and receiving probe for measuring near-electromagnetic-field.

  190. B-4-43 Estimating of Current Distribution on Microstrip Line by Using FDTD Method

    Takasu Kazuhiro, Teramoto Manabu, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2005 (1) 404-404 2005/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  191. B-1-124 SAR of 2-element Monopole Array Antenna Mounted on a Slit Chassis for Mobile Phone

    Komukai Yasunori, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2005 (1) 124-124 2005/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  192. B-1-279 Simultaneous EM Field Measurement System by Using Modulated Scattering Element

    Watanabe Takashi, Chen Qiang, Sawaya Kunio, Habu Tomohiro, Watanabe Ikuo

    Proceedings of the IEICE General Conference 2005 (1) 279-279 2005/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  193. B-1-248 Capacity Analysis of Outdoor MIMO Systems by Using Ray Launching Method

    Nakatsu Daisuke, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2005 (1) 248-248 2005/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  194. B-1-56 Diversity Antenna Composed of Scattering Modulation Elements

    Chen Qiang, Yuan Qiaowei, Ishitsu Masaya, Sawaya Kunio

    Proceedings of the IEICE General Conference 2005 (1) 56-56 2005/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  195. B-1-225 Joint Estimation of DOA and Polarization Using MUSIC Algorithm

    Yuan Qiaowei, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2005 (1) 225-225 2005/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  196. Compensation of Mutual Coupling for DOA Estimation Using Array Antenna with Arbitrary Geometry

    YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio

    IEICE technical report 104 (683) 163-168 2005/02/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

    More details Close

    So called universal steering vector (USV) whose element is equivalent to array element pattern is applied to the direction of arrival (DOA) estimation by multiple signal classification (MUSIC) algorithm. The relationship between USV and conventional steering vector (CSV) is shown that the USV can be regarded as the CSV compensated by the inverse of the mutual coupling matrix which is a dynamic matrix depending on each searching direction and polarization and includes theoretically all mechanical and electrical errors of array elements. It is obviously that the estimation error of DOA due to the mutual coupling effect between array elements is compensated by using the USV. Simulation of DOA estimation for 6 element dipole and 2 element monopole-PIFA array antenna are carried out to compare the accuracy obtained by the USV, the CSV and the Dandekar's [5] methods. The received voltages are also measured at the terminals of 4 element array antenna consisting of two monopole antennas and two loop antennas on a rectangular conducting plane, and are used to DOA estimation to demonstrate the practical effectiveness of the present method.

  197. Compensation of Mutual Coupling for DOA Estimation Using Array Antenna with Arbitrary Geometry

    YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. WBS, Wideband System 104 (674) 163-168 2005/02/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

    More details Close

    So called universal steering vector (USV) whose element is equivalent to array element pattern is applied to the direction of arrival (DOA) estimation by multiple signal classification (MUSIC) algorithm. The relationship between USV and conventional steering vector (CSV) is shown that the USV can be regarded as the CSV compensated by the inverse of the mutual coupling matrix which is a dynamic matrix depending on each searching direction and polarization and includes theoretically all mechanical and electrical errors of array elements. It is obviously that the estimation error of DOA due to the mutual coupling effect between array elements is compensated by using the USV. Simulation of DOA estimation for 6 element dipole and 2 element monopole-PIFA array antenna are carried out to compare the accuracy obtained by the USV, the CSV and the Dandekar's [5] methods. The received voltages are also measured at the terminals of 4 element array antenna consisting of two monopole antennas and two loop antennas on a rectangular conducting plane, and are used to DOA estimation to demonstrate the practical effectiveness of the present method.

  198. Compensation of Mutual Coupling for DOA Estimation Using Array Antenna with Arbitrary Geometry

    YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Microwaves 104 (686) 163-168 2005/02/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

    More details Close

    So called universal steering vector (USV) whose element is equivalent to array element pattern is applied to the direction of arrival (DOA) estimation by multiple signal classification (MUSIC) algorithm. The relationship between USV and conventional steering vector (CSV) is shown that the USV can be regarded as the CSV compensated by the inverse of the mutual coupling matrix which is a dynamic matrix depending on each searching direction and polarization and includes theoretically all mechanical and electrical errors of array elements. It is obviously that the estimation error of DOA due to the mutual coupling effect between array elements is compensated by using the USV. Simulation of DOA estimation for 6 element dipole and 2 element monopole-PIFA array antenna are carried out to compare the accuracy obtained by the USV, the CSV and the Dandekar's [5] methods. The received voltages are also measured at the terminals of 4 element array antenna consisting of two monopole antennas and two loop antennas on a rectangular conducting plane, and are used to DOA estimation to demonstrate the practical effectiveness of the present method.

  199. Compensation of Mutual Coupling for DOA Estimation Using Array Antenna with Arbitrary Geometry

    YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 104 (677) 163-168 2005/02/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

    More details Close

    So called universal steering vector (USV) whose element is equivalent to array element pattern is applied to the direction of arrival (DOA) estimation by multiple signal classification (MUSIC) algorithm. The relationship between USV and conventional steering vector (CSV) is shown that the USV can be regarded as the CSV compensated by the inverse of the mutual coupling matrix which is a dynamic matrix depending on each searching direction and polarization and includes theoretically all mechanical and electrical errors of array elements. It is obviously that the estimation error of DOA due to the mutual coupling effect between array elements is compensated by using the USV. Simulation of DOA estimation for 6 element dipole and 2 element monopole-PIFA array antenna are carried out to compare the accuracy obtained by the USV, the CSV and the Dandekar's [5] methods. The received voltages are also measured at the terminals of 4 element array antenna consisting of two monopole antennas and two loop antennas on a rectangular conducting plane, and are used to DOA estimation to demonstrate the practical effectiveness of the present method.

  200. Compensation of Mutual Coupling for DOA Estimation Using Array Antenna with Arbitrary Geometry

    YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio

    Technical report of IEICE. RCS 104 (680) 163-168 2005/02/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

    More details Close

    So called universal steering vector (USV) whose element is equivalent to array element pattern is applied to the direction of arrival (DOA) estimation by multiple signal classification (MUSIC) algorithm. The relationship between USV and conventional steering vector (CSV) is shown that the USV can be regarded as the CSV compensated by the inverse of the mutual coupling matrix which is a dynamic matrix depending on each searching direction and polarization and includes theoretically all mechanical and electrical errors of array elements. It is obviously that the estimation error of DOA due to the mutual coupling effect between array elements is compensated by using the USV. Simulation of DOA estimation for 6 element dipole and 2 element monopole-PIFA array antenna are carried out to compare the accuracy obtained by the USV, the CSV and the Dandekar's [5] methods. The received voltages are also measured at the terminals of 4 element array antenna consisting of two monopole antennas and two loop antennas on a rectangular conducting plane, and are used to DOA estimation to demonstrate the practical effectiveness of the present method.

  201. Simultaneous EM Field Measurement Method by Using Modulated Scattering Elements

    CHEN Qiang, WADA Masaya, SAWAYA Kunio

    IEICE technical report. Electromagnetic compatibility 104 (232) 11-14 2004/07/23

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    It is required to measure the electromagnetic field at several points simultaneously to evaluate radiation pattern and radiation efficiency of antennas quickly and to catch the randomly generated electromagnetic noise from electronic devices. In this research, modulated scattering method is proposed to measure the electromagnetic field at several points simultaneously. The local signal with different frequency is excited on the modulated scattering elements (MSEs) which are located at the different measurement points. The scattered modulated field form these MSEs is received by a receiving antenna and microwave receiver. This proposed method is applied to measure the radiation pattern of dipole and log periodic antennas.

  202. Non-invasive Near Field Measurement Using Modulated Scattering Element

    CHAKAROTHAI Jerdvisanop, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Electromagnetic compatibility 104 (150) 13-16 2004/06/23

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    As operating frequency increases, the problem that undesired noise is radiated from electronic devices becomes more and more serious. To solve this problem, it is necessary to measure the electromagnetic field near the devices accurately to detect the source location of the electromagnetic radiation. However, usually the probe and its cable disturb the original field distribution and degrade the accuracy of the near field measurement. In this report, a non-invasive near-field measurement method using a modulated scattering element as the probe which is wireless and electrically small is proposed and validity of the method is demonstrated by the experiment.

  203. B-1-228 Numerical Method for Analysis of Channel Transfer Matrix of MIMO System

    Yamaguchi Kenji, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2004 (1) 228-228 2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  204. B-1-265 Effect of Receiving Pattern on the Method for Estimation of Source Location in Urban Area

    Nogami Toshizo, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2004 (1) 265-265 2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  205. B-1-283 Simultaneous EM Field Measurement System by Using Modulated Scattering Technique

    Wada Masaya, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2004 (1) 283-283 2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  206. B-1-75 Fast Algorithm for Solving Matrix Equation in MoM Using SOR Method

    Chen Qiang, Yuan Qiaowei, Sawaya Kunio

    Proceedings of the IEICE General Conference 2004 (1) 75-75 2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  207. B-1-264 Experimental Study on Adaptive Array Antenna for Mobile Handset

    Miyazawa Mitsuyoshi, Sakai Keiji, Yuan Qiaowei, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2004 (1) 264-264 2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  208. B-1-266 DOA Estimation Using Universal Steering Vector

    Yuan Qiaowei, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2004 (1) 266-266 2004/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  209. Study on Decreasing SAR by Using Array Antenna for Mobile Phone

    KOMUKAI Yasunori, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Electromagnetic compatibility 103 (440) 5-10 2004/01/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    This study attempt to improve SAR and radiation efficiency at near by human head model using by array antenna for mobile phone. Result these examinations, characteristics of SAR and radiation efficiency improve in case of intervals of λ/2π between array antenna and human head model in case of reversed phase feed in array antenna. Moreover result of examination indicate that calculations result agree with experimentation one.

  210. B-1-282 Near Field Measurement Method by Using Modulated Scattering Element

    Chakarothai Jerdvisanop, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 282-282 2004

    Publisher: The Institute of Electronics, Information and Communication Engineers

  211. Fast Iterative Algorithm for Solving Matrix Equation in MoM Analysis of Large-Scale Array Antennas

    CHEN Qiang, YUAN Qiaowei, SAWAYA Kunio

    ITE technical report 27 (50) 7-10 2003/09/11

    Publisher: 映像情報メディア学会

    ISSN: 1342-6893

  212. Experiment on Estimation of Source Location by Using MUSIC Algorithm

    Nogami Toshizo, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2003 (1) 126-126 2003/09/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

  213. FDTD Analysis on Patch Array Antennas for Mobile Handset : Effects of Geometry of Array Elements and Ground Plate

    YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 103 (64) 37-40 2003/05/23

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    The characteristics of adaptive array antennas are strongly affected not only by the beam control algorithms, but also by the element configuration, the size of the ground plate. Four kinds of patch antennas are studied by using the FDTD method. The scanning characteristics of patterns for several arrays are investigated in details in order to determine the suitable configuration used for the array antenna of mobile handset. Furthermore, the XPD in the scanning plane and nutual coupling between elements are calculated. Finally, the effect of the ground size on the radiation pattern of array antenna is investigated in order to determine the optimum size of the ground plate for the beam control of the arrays.

  214. A Multi-band Planer Antenna by using PIN Diodes

    Kurahashi Makoto, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2003 (1) 233-233 2003/03/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

  215. Study of Directivity Control of Array Antenna for Mobile Phone

    KOMUKAI Yasunori, Chen Qiang, SAWAYA Kunio

    Proceedings of the IEICE General Conference 2003 (1) 194-194 2003/03/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

  216. Numerical Simulation of MIMO System by Using Dipole Array

    Yamaguchi Kenji, Chenq Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2003 (1) 27-27 2003/03/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

  217. Radiation Efficiency of Mricrostrip Array Antenna

    Yuan Qiaowei, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2003 (1) 249-249 2003/03/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

  218. EM Field Measurement by using array of Modulated Scattering Dipole Elements

    Irie Yasuyuki, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 154-154 2003

    Publisher: The Institute of Electronics, Information and Communication Engineers

  219. Analysis of Printed Antennas by Using Galerkin's Moment Method

    YANATSUBO Takashi, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 102 (232) 59-63 2002/07/26

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Printed antennas are widely used in the wireless communications because of the advantages such as low profile and easy fabrication. Highly accurate analysis methods are required for numerical design of the printed antennas. In this report, a numerical method using Galerkin MoM for block modeling is proposed for the analysis of an antenna in the vicinity of dielectric scatterer. Accuracy of the numerical integration for evaluating the self and mutual impedance between the dielectric blocks is improved by exchanging the order of differential and integral calculation. The block modeling is also improved by introducing polarization current mode normal to the surface the dielectric body. The numerical results are compared with experimental data demonstrating the validity and high accuracy of the proposed method.

  220. 27aB24P Fundamental Characteristics of Tapered Slot Antenna for Microwave Imaging Reflectometer

    KUDO Daiki, TSUGUEDA Hisaki, HATTORI Kunihiko, TOBARI Hiroyuki, YAGAI Tsuyoshi, ANDO Akira, INUTAKE Masaaki, CHEN Qiang, SAWAYA Kunio

    (19) 114-114 2002

    Publisher: プラズマ・核融合学会

  221. Analysis of Emission from Printed Circuit Board on a Microstrip Line Located Asymmetrically

    TOBANA Teruo, SASAMORI Takayuki, ABE Kohshi, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Microwaves 101 (393) 75-80 2001/10/19

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In order to study the effects of the position of a microstrip line on the radiation from the printed circuit board(PCB), the emission from PCB by changing the position of the microstrip line is analyzed by using FDTD method. It is shown that the radiation is caused by the common-mode currents which depends on the position of the microstrip line.

  222. Study on Frequency-Selective Electrodynamic Behavior of Surface Layered Tissues of Head Phantoms

    MINOSIAN Maxim, SATO Hiroyasu, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Electromagnetic compatibility 101 (392) 45-51 2001/10/19

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Study on mechanism of electromagnetic adsorption by the layered head phantoms is presented through analysis of one-dimensional layered models treated as a transmission line and FDTD analysis on three dimensional spherical and realistic models of the head excited by a nearby dipole antenna. Analysis on the phantoms composed of fat, bone and brain tissues shows that fat and bone layers ensure impedance matching between free space and the brain tissue around 2.6GHz, which causes considerable growth of the head SAR. Skin and muscle layers cause damping of frequency-selective properties of the layered phantoms. Muscle layer is shown to play dominant role in shielding of the head interior.

  223. B-1-108 Fast Algorithm for Solving Matrix Equation in MoM Analysis of Array Antenna

    Chen Qiang, Yuan Qiaowei, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2001 (1) 114-114 2001/08/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

  224. Numerical Analysis of Antennas near Dielectric Body Using Block Model and Galarkin's Method

    Yanatsubo Takashi, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 2001 (1) 55-55 2001/08/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

  225. Numerical Analysis of Semiconductor Relay by Using FDTD Method

    YASUNAMI Kazuhiro, CHEN Qiang, SAWAYA Kunio, ICHII Yoshitaka, HIRATA Katsuhiro

    IEICE technical report. Antennas and propagation 101 (119) 37-40 2001/06/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In recent years, semiconductor devices operating at high frequency are required, since the operation frequency of the electronic equipment is becoming higher and higher. The semiconductor relay, known as the high-performance elements and widely used in the electronic measuring instruments and the communication equipment, is expected to be operated at high frequency region. The object of this study is to analyze characteristics of semiconductor relays at high frequency range to improve design of the relay elements. The numerical analysis using FDTD method are applied to evaluate the S parameters of the semiconductor relay with the dielectric package and the calculated results are compared with the measured data.

  226. Effect of Ground Size for Emission from a Printed Circuit Board

    TOBANA Teruo, SASAMORI Takayuki, ABE Kohshi, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Electromagnetic compatibility 101 (129) 35-40 2001/06/15

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In order to study the effects of the size of a ground plane on the radiation from the microstrip lines, the emission from a microstrip line on a printed circuit board by changing the width and length of the ground plane is analyzed by using FDTD method. It is shown that the common-mode currents is excited by difference of length between the microstrip line and the ground plane, and a large emission from PCB with a narrow ground plane is mainly caused by common-mode current on the under side of the ground plane. The experimental results indicate validity of the numerical results.

  227. Bandwidth of Phased Array Antenna Using LPDA Elements

    KIM Daegeun, YAMAGUCHI Satoshi, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 101 (50) 65-71 2001/05/18

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Various mobile communication services are provided and each service uses different frequency. It is expected to develop the broadband phased array antennas which have bandwidth covering most of the frequency span for the various mobile communication services. In this report, the bandwidth characteristics of the phased array antenna using the log-periodic dipole array (LPDA) antenna is analyzed by using the method of moments (MoM). A 5×5 planar phased array of LPDA antennas is investigated as an example. The bandwidth is determined by the actual gain, the sidelobe level(SLL) and the scan angle deviation(SAD). Furthermore, the mutual coupling between the LPDA antennas is compared with that of the tapered slot antenna (TSA) which is also one of the broadband antennas, which shows the coupling between the elements are dependent on the array configuration greatly.

  228. Analysis on a Microstrip Line with a Bend by FDTD Method

    OKUBO Kan, CHANG Qiang, SAWAYA Kunio, SHIOKAWA Takayasu

    IEICE technical report. Antennas and propagation 101 (50) 85-92 2001/05/18

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    According to the progress of electronic equipment, the effect of the undesired electromagnetic wave radiated from the discontinuous parts of printed circuit board becomes severe. In this paper we analyzed the characteristics of emission from the microstrip line with 90° bend which is one of the discontinuous parts by FDTD method. As a result, we quantitatively evaluated the radiation efficiency and also explained the mechanism of the radiation from the microstrip line with 90°bend.

  229. Design of Broadband Tapered Slot Antenna Fed by Microstrip Line

    YAMAGUCHI Satoshi, CHEN Qiang, SAWAYA Kunio, KITAYOSHI Hitoshi

    IEICE technical report. Antennas and propagation 101 (50) 57-64 2001/05/18

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In the information-oriented society, multimedia communication of high-speed and high capacity is required. The antennas used in the communication system are required to have the characteristics of broad band, light weight, small size and low cost. Tapered Slot Antenna(TSA) is one of the candidates and is studied widely. In this study, TSA fed by microstrip line is designed by the equivalent circuit method, and its broadband characteristic is investigated. Numerical results by using FDTD method, as well as the experimental results show the effect of the feeding circuit on the band width of TSA. It is shown that the bandwidth depends on the shape of feeding stub of the microstrip line and the slot line.

  230. Estimation of EM Source Location in the City Area by Concidering Diffraction Wave

    NOGAMI Toshizo, CHEN Qiang, SAWAYA Kunio, KITAYOSHI Hitoshi

    IEICE technical report. Antennas and propagation 101 (49) 37-44 2001/05/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Recently radio communication technology seeps in all extremely wide field and becomes indispensable to our world. However, on the other hand the illegality radio station is increasing which become the radio interference / jamming to these general radio communication. As for the search of illegal radio station, estimation of location of a wave source by an inquiry of an incoming wave direction, such as MUSIC algorithm, has been applied conventionally. However, in the technique, there is a problem that estimation of wave source location is difficult in complicated multipath environment. The purpose of this study is to estimate the location of a electromagnetic wave source in such multipath environment. An estimation method is suggested based on ray tracing method / UTD method. The effectiveness of the method is examined by numerical simulation.

  231. Broadband Phased Array Antenna Using Log-Periodic Elements

    KIM Daegeun, CHEN Qiang, SAWAYA Kunio

    Proceedings of the IEICE General Conference 2001 (1) 135-135 2001/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  232. Numerical Analysis of Tapered Slot Array Antenna

    Yamaguchi Satoshi, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2001 (1) 128-128 2001/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  233. Analysis of Antenna in the Vicinity of Dielectric Scatterer by Using Block Model and Galerkin-MoM

    Koizumi Daisuke, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2001 (1) 202-202 2001/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  234. Measurement of Propagation of Electromagnetic Wave by Eliminating Antenna Characteristics

    Yamashita Yusuke, Sato Hiroyasu, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 2001 (1) 328-328 2001/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  235. Numerical Analysis of Semiconductor Relay by Using FDTD Method

    Yasunami Kazuhiro, Chen Qiang, Sawaya Kunio, Ichii Yoshitaka, Hirata Katsuhiro

    Proceedings of the IEICE General Conference 2001 (1) 364-364 2001/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  236. Estimation of Location of Electromagnetic Wave Sourse by Using Ray Tracing Method

    Nogami Toshizo, Chen Qiang, Sawaya Kunio, Kitayoshi Hitoshi

    Proceedings of the IEICE General Conference 2001 (1) 52-52 2001/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  237. Suppression Effect of Emission from Printed Circuit Board with Finite Ground Plane Using Ferrite Sheets

    TOBANA Teruo, CHEN Qiang, SAWAYA Kunio, SASAMORI Takayuki, ABE Kohshi

    IEICE technical report. Electromagnetic compatibility 100 (363) 35-40 2000/10/12

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Radiated emission from a, printed circuit board(PCB)is a serious problem in a field of EMC/EMI. In order to suppress the radiated emission from a PCB, some types of magnetic absorbers, such as a ferrite sheet are used. To investigate the appropriate use or ferrite sheets, we analyze the suppression effect of ferrite sheets that are placed nearby a PCB with a finite ground plane and a microstrip line. Frequency dependent finite different time domain (FD-FDTD) method is appliend as an analysis method. The calculated results show that the characteristic of the emission depends on the size of the ground plane and large suppression effect is achieved by using a ferrite sheet larger than the ground plane or a ferrite sheet placed on the side of ground plane.

  238. Analysis of Antenna in the Vicinity of Dielectric Scatterer by Using Block Modeling and Galerkin-MoM

    KOIZUMI Daisuke, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 100 (292) 31-38 2000/09/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Recently, the use of antenna near human body becomes a social and engneering problem as the mobile communications become popular and wide-spread. Accordingly, the problems are the decrease of antenna efficiency near human body and the effect of undesired absorption of the electromagnetic power into human body. Therefore, it is necessary to investigate the mutual effect between human body and antenna. In this study, the antenna near the dielectric material is analyzed by using Galerkin's moment-method in which the basis and test functions are the sinusoid function and the block model is used for the dielectric material. In order to reduce the CPU time for calculating the self/mutual impedance between block segment, the double volume integral appearing in the expression of the self/mutual impedance is transformed into triple integral. Numerical analysis is performed for the dipole antenna near the rectanglar dielectric material. In order to confirm the validity of the proposed method, the FDTD method as well as the experimental results are compared with the results of the proposed analysis.

  239. Numerical Simulation of Electromagnetic Wave Propagation in Urban Environment by Using Ray Tracing Method

    NOGAMI Toshizo, CHEN Qiang, SAWAYA Kunio, KITAYOSHI Hitoshi

    Technical report of IEICE. OCS 100 (314) 1-6 2000/09/15

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Recently the mobile communication systems including cellular systems have become popular and wide spread in our life. Especially in the most urban areas many subscribers have become to use the mobile communications. Therefore, it is required to analyze the wave propagation in the urban area to provide a stable service to users through the mobile communications network. For this purpose, we simulate the electric field distribution of urban areas in which a wave source is surrounded by buildings. As for the simulation method, we use the 3 dimensinal ray tracing and the uniform geometrical theory of diffraction(UTD). Also we compare the numerical result with the experimental one which is achieved from the miniature model of real buildings.

  240. 2 Elements Array of MS-LPDA Antenna

    KIM Daegeun, CHEN Qiang, SAWAYA Kunio

    Technical report of IEICE. OCS 100 (314) 7-11 2000/09/15

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    According to the rapid development of technologies and wide spread of users in the mobile telecommunications area, the needs for a small and broadband antenna become indispensable. Also a phased array technology is one of bases for antennas for wireless telecommunications such as the smart antenna which is necessary to provide the seamless and high quality service to as many users as possible. As a first step for the broadband phased array, some characteristics of two element array of a small and broadband MS-LPDA antenna are presented in this report. The mutual coupling and the element pattern are investigated through single-fed equi-E and equi-H-plane arrays. The beam scanning pattern is also studied through two basic structures of the phased array, and it is shown that the side lobe level changes according to the distance between array elements and the frequencies.

  241. Suppression Effect of the Emission from a Printed Circuit Board Using a Ferrite Plate

    TOBANA Teruo, CHEN Qiang, SAWAYA Kunio, SASAMORI Takayuki, ABE Kohshi

    IEICE technical report. Electromagnetic compatibility 100 (49) 43-48 2000/05/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    Radiated emission from a printed circuit board(PCB)is a serious topic in a field of EMC / EMI. In order to suppress the radiated emission, it is used some type of electromagnetic absorber, such as ferrite plates or carbon plates. To investigate the appropriate use of a ferrite plate, we analyze the suppression effect of a ferrite plate that is placed nearby a PCB with a microstrip line. Frequency dependent finite different time domain(FD-FDTD)method is used as an analysis method. The calculated results show that the suppression effect is achieved by the ferrite plate placed at a large magnetic field intensity. In the case of a PCB with a finite ground plane, the suppression effect is achieved by the ferrite plate placed on the ground plane opposite side of a microstrip line.

  242. Design of Array Antenna with High Radiation Efficiency for Portable Telephone

    SATO Kenji, CHEN Qiang, SAWAYA Kunio

    Technical Report of IEICE 99 (706) 55-60 2000/03/17

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    In this report, the monopole Yagi-Uda array antenna with a parasitic element is developed for the portable telephone to improve the radiation efficiency. The results are validated by the numerical analysis and measurement, which show the antenna has a broad bandwidth and high radiation efficiency.

  243. FDTD Analysis of Large Scale Phased Arrays of Patch Antennas

    IDURU Yasuyuki, CHEN Qiang, SAWAYA Kunio, HISADA Yasumasa, SEZAI Toshihiro

    Proceedings of the IEICE General Conference 2000 (1) 47-47 2000/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  244. Design and Analysis of Broadband MS-LPDA Antenna

    KIM Daegeun, CHEN Qiang, SAWAYA Kunio, IGARI Kazuhisa, KOJIMA Nakato

    Proceedings of the IEICE General Conference 2000 (1) 88-88 2000/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  245. Galerkin-MoM Analysis of Printed Antenna Using Block Modeling

    OFUJI Yoshiaki, KOIZUMI Daisuke, CHEN Qiang, SAWAYA Kunio

    Proceedings of the IEICE General Conference 2000 (1) 54-54 2000/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  246. Algorithm of Method of Moment of Richmond for Super Computer

    FURUYA Satoshi, CHEN Qiang, SAWAYA Kunio

    Proceedings of the IEICE General Conference 2000 (1) 55-55 2000/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  247. A Study on Comparison of the Head Phantoms Featuring Thin Layered Surface Structure

    MINOSIAN Maksim, SATO Hiroyasu, CHEN Qiang, SAWAYA Kunio

    Proceedings of the IEICE General Conference 2000 (1) 379-379 2000/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  248. Radiation Efficiency of Array Antenna for Portable Telephone in the Vicinity of Human Body

    SATO Kenji, CHEN Qiang, IGARI Kazuhisa, SAWAYA Kunio

    Proceedings of the IEICE General Conference 2000 (1) 192-192 2000/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  249. Estimation of Near Field Excited by Electromagnetic Sources by Using Spherical Scanning Technique

    TSUHARA Koichi, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 99 (44) 83-88 1999/05/14

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    Recently the electromagnetic interference caused by the digital equipment has become serious problem due to the increase of frequency used in this equipment. In order to overcome the problem, the planar electromagnetic holography techniques have been used. However, these techniques can not be used in the low frequency region, since the dimension of the scanning area are required to be several wavelengths. In this report, fundamental study of a method to visualize the electromagnetic field in the vicinity of sources by using a spherical scanning technique is presented.

  250. Radiation Efficiency of Small Loop Antennas for Pager

    SASAKI Makoto, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 99 (44) 77-81 1999/05/14

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    It is well known that the radiation efficiency of small loop antenna used for pager is very low since the size of the antenna is much smaller than the wavelength. However, any accurate analybis has not been performed to show the mechanism of the low efficiency of the small loop antenna for pager. In this report, numerical results of the moment method analysis of small loop antenna with a ground plane and a matching circuit involving condensers are presented and the dielectric loss of the condensers as well as the conducting loss of the antenna and the feeding circuit are shown. Experimental results are also presented to demonstrate the accuracy of the computation.

  251. SB-1-7 Numerical Techniques for Analysis of Antennas in the Vicinity of Human Model

    Sawaya Kunio, Chen Qiang

    Proceedings of the IEICE General Conference 1999 (1) 645-646 1999/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  252. B-1-77 Estimation Error of Near Field Excited by an Electromagnetic Source by Using Spherical Field Measurements

    Tsuhara Koichi, Chen Qiang, Sawaya Kunio

    Proceedings of the IEICE General Conference 1999 (1) 77-77 1999/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  253. B-1-183 Moment Method Analysis of Loop Antenna for Pager

    SASAKI Makoto, CHEN Qiang, SAWAYA Kunio

    Proceedings of the IEICE General Conference 1999 (1) 183-183 1999/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  254. B-1-103 Accurate Source Model for MoM Analysis of Linear Antennas by Using Sinusoidal Reaction Matching

    Chen Qiang, Yuan Qiaowei, Sawaya Kunio

    Proceedings of the IEICE General Conference 1999 (1) 103-103 1999/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  255. B-4-5 Effect of Shielding Plate for Pager

    YUAN Qiaowei, KITAMURA Singo, CHEN Qiang, SAWAYA Kunio

    Proceedings of the IEICE General Conference 1999 (1) 286-286 1999/03/08

    Publisher: The Institute of Electronics, Information and Communication Engineers

  256. FDTD法によるコプレナ線路共振器の解析

    角田慎一, 陳強, 沢谷邦男

    電気関係学会東北支部連合大会講演論文集 1999 1999

  257. マイクロストリップ線路近傍に置いた磁性体による不要電磁波抑制効果

    戸花照雄, 笹森崇行, 阿部紘士, 陳強, 沢谷邦男

    電気関係学会東北支部連合大会講演論文集 1999 1999

  258. 携帯電話機用アレーアンテナの放射効率

    佐藤賢治, 陳強, 猪狩和久, 沢谷邦男

    電気関係学会東北支部連合大会講演論文集 1999 1999

  259. 無給電素子を用いたKa帯広帯域パッチアンテナ

    居鶴恭幸, 陳強, 沢谷邦男

    電気関係学会東北支部連合大会講演論文集 1999 1999

  260. COST244人体頭部規範モデル近傍に置かれた金属きょう体付きλ/4モノポールアンテナの放射効率の測定

    山口聡, 陳強, 猪狩和久, 沢谷邦男

    電気関係学会東北支部連合大会講演論文集 1999 1999

  261. Richmondのモーメント法におけるベクトル化率の向上

    古屋聡士, 陳強, 沢谷邦男

    電気関係学会東北支部連合大会講演論文集 1999 1999

  262. Wide Bandwidth Patch Antenna for Ka-Band Inter Satellite Communications.

    陳強, 沢谷邦男, 久田安正, 瀬在俊浩, 赤石明

    宇宙科学技術連合講演会講演集 43rd 1999

  263. SB-1-9 Measurement of Radiation Efficiency of Monopole Antennas mounted on conducting box in the Vicinity of COST244 Standard Head Model

    Yoshioka Hiroki, Chen Qiang, Igari Kazuhisa, Sawaya Kunio

    Proceedings of the IEICE General Conference 649-649 1999

    Publisher: The Institute of Electronics, Information and Communication Engineers

  264. Accurate Source Model for MoM Analysis of Linear Antennas by Using Sinusoidal Reaction Matching

    CHEN Qiang, YUAN Qiaowei, SAWAYA Kunio

    Technical report of IEICE. SAT 98 (404) 39-43 1998/11/19

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    A new source model for MoM analysis by using sinusoidal reaction matching is proposed for linear antenna analysis. This source model is applied to both the reduced kernel approximation and the full kernel formulation. The analysis results are compared with the results of the conventional methods and measurement. It is found that the new model includes the effect of the length of driving gap and the solution from the new source model is more accurate and more stable than that from the conventional source models. The proposed source model is simple and easy to use. This source model, together with the full kernel formulation, makes it possible to analyze the linear dipole antennas with no limitation of ratio of segment length to radius.

  265. Accurate Source Model for MoM Analysis of Linear Antennas by Using Sinusoidal Reaction Matching

    CHEN Qiang, YUAN Qiaowei, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 98 (402) 39-43 1998/11/19

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    A new source model for MoM analysis by using sinusoidal reaction matching is proposed for linear antenna analysis. This source model is applied to both the reduced kernel approximation and the full kernel formulation. The analysis results are compared with the results of the conventional methods and measurement. It is found that the new model includes the effect of the length of driving gap and the solution from the new source model is more accurate and more stable than that from the conventional source models. The proposed source model is simple and easy to use. This source model, together with the full kernel formulation, makes it possible to analyze the linear dipole antennas with no limitation of ratio of segment length to radius.

  266. Accurate Source Model for MoM Analysis of Linear Antennas by Using Sinusoidal Reaction Matching

    CHEN Qiang, YUAN Qiaowei, SAWAYA Kunio

    Technical report of IEICE. SANE 98 (403) 39-43 1998/11/19

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    A new source model for MoM analysis by using sinusoidal reaction matching is proposed for linear antenna analysis. This source model is applied to both the reduced kernel approximation and the full kernel formulation. The analysis results are compared with the results of the conventional methods and measurement. It is found that the new model includes the effect of the length of driving gap and the solution from the new source model is more accurate and more stable than that from the conventional source models. The proposed source model is simple and easy to use. This source model, together with the full kernel formulation, makes it possible to analyze the linear dipole antennas with no limitation of ratio of segment length to radius.

  267. Q Value Computation for the Microstrip Resonator by Using FDTD Method

    HONMA Naoki, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Microwaves 98 (327) 43-46 1998/10/16

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    A method using microstrip line resonator has been employed to measure the surface resistance of high T_c oxide superconducting material. Since the loss of the superconductor is very small, the dielectric loss of the microstrip line and the conducting loss of the cavity which is used to enclose the resonator can not be omitted when evaluating the Q value of the resonator. The FDTD method can be applied to analyze the resonator including both of the dielectric loss and the conducting loss, but the method is not effective when the Q value is very high. In this paper, 3 kinds of approaches are applied to evaluate the Q value of the microstrip line resonator enclosed inside a conducting cavity. The numerical results of these approaches are compared and the validity of each approach are discussed.

  268. Comparison of Measurement Methods for Radiation Efficiency of Antennas in the Vicinity of Human Body

    CHEN Qiang, YOSHIOKA Hiroki, IGARI Kazuhisa, SAWAYA Kunio

    IEICE technical report. Electromagnetic compatibility 98 (285) 23-26 1998/09/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    In the design of antennas for portable telephones, it is important to evaluate the radiation efficiency of antennas, since the radiation efficiency could decrease due to the power absorption by human body. In this report, the radiation efficiency of a dipole antenna in the vicinity of a human model is measured by using the the pattern integration method and the the random field method. The experiment setups for both methods are described. The experiment results are shown and compared with the results of the numerical analysis by the Finite Difference Time Domain (FDTD) method.

  269. FDTD Analysis for Electromagnetic Radiation in Anisotropic Plasma

    CHEN Qiang, SATO Hiroyasu, SAWAYA Kunio

    Proceedings of the Society Conference of IEICE 1998 (1) 90-90 1998/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  270. Reconstruction of Near Field Excited by a Slot Antenna

    Tsuhara Koichi, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 1998 (1) 73-73 1998/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  271. Measurement and Improvement of Radiation Efficiency of a Loop Antenna Used for Pager

    SASAKI Makoto, CHEN Qiang, NAKAMURA Seizo, SAWAYA Kunio

    Proceedings of the Society Conference of IEICE 1998 (1) 95-95 1998/09/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  272. Measurement of Radiation Efficiency of Pager's Small Loop Antenna

    SASAKI Makoto, CHEN Qiang, NAKAMURA Seizo, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 98 (46) 25-29 1998/05/14

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    Poor radiation efficiency is sufficient disadvantage of the loop antennas used in the pagers. It has been pointed out that decrease of radiation efficiency is mainly caused by the copper losses of the antenna from the study of the relation between the conductivity of copper and radiation efficiecy. Further investigations, however, clearly shown, that radiation efficiency of the antenna strongly depends on the losses of the capacitor being a part of impedance matching circuit of the jpager. In our opinion, study on the relation between the Q-factor of the capacitor and radiation efficiency of the antenna is point of great interest. In the present report measurements of radiation efficiency of the small loop antenna of the pager are carried out by means of the pattern integration method, and results on the relation between the Q-factor of the capacitor and radiation efficiency of the antenna are presented.

  273. FDTD Analysis of Superconducting Resonator Covered with Conducting Cavity

    HONMA Naoki, CHEN Qiang, SAWAYA Kunio

    Proceedings of the IEICE General Conference 1998 (1) 77-77 1998/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  274. Numerical Analysis of Wide Band Patch Antenna for Ka Band

    ITAGAKI Tomoari, CHEN Qiang, SAWAYA Kunio, UERA Yasukichi, HISADA Yasumasa

    Proceedings of the IEICE General Conference 1998 (1) 80-80 1998/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  275. Calculation Method of Absorbing Power in a Anisotropic Magnetic Material Using FDTD Method

    TOBANA Teruo, CHEN Qiang, SAWAYA Kunio

    Proceedings of the IEICE General Conference 1998 (1) 344-344 1998/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  276. 3D-FDTD Analysis of Electroamagnetic Wave in Q-Machine Plasma

    SATO Hiroyasu, CHEN Qiang, SAWAYA Kunio

    Proceedings of the IEICE General Conference 1998 (1) 182-182 1998/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  277. Measurement of antenna radiation efficiency in the vicinity of a COST244 reference model.

    吉岡弘貴, 陳強, 猪狩和久, 沢谷邦夫

    電気関係学会東北支部連合大会講演論文集 1998 1998

  278. Estimation of a radio wave source by spherical scanning.

    津原康一, 陳強, 沢谷邦男

    電気関係学会東北支部連合大会講演論文集 1998 1998

  279. Measurement of a magnetic field in the vicinity of high voltage transmission line.

    猪狩和久, 陳強, 沢谷邦男

    電気関係学会東北支部連合大会講演論文集 1998 1998

  280. Band widening of a Yagi and Uda antenna.

    大藤義顕, 陳強, 沢谷邦夫

    電気関係学会東北支部連合大会講演論文集 1998 1998

  281. Measurement of Radiation Efficiency of Antennas in the Vicinity of COST244 Standard Head Model

    Yoshioka Hiroki, Chen Qiang, Igari Kazuhisa, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 103-103 1998

    Publisher: The Institute of Electronics, Information and Communication Engineers

  282. A Planar Inverted F Antenna with λ/4 Short Conducting Cover for Portable Telephone

    CHEN Qiang, YUAN Qiaowei, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 97 (227) 15-19 1997/08/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    A new structure of the planar inverted F antenna (PIFA) is proposed. In this structure, a λ/4 short cover is loaded behind the ground plane. By the numerical simulation using the FDTD method, it is found that the PIFA with the λ/4 short cover has a higher radiation efficiency than the conventional PIFA when it is used for the portable telephone antenna in the vicinity of the human body.

  283. 3-Dimmensional Dispersive and Anisotropic PML Absorbing Boundary Condition

    SATO Hiroyasu, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 97 (146) 1-8 1997/07/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    In order to analyze the antenna radiating into dispersive and anisotropic media such as the magneto-plasma by using the FDTD, the usual absoebing bounday condition (ABC), such as the Mur-ABC or the Higdon-ABC etc. can not be apllied. In this report, an absorbing boundary condition for the dispersive and anisotropic medium, which is based on Berenger PML-ABC, is proposed. In order to demonstrate the validity of the presented boundary condition, numerical results for radiation from electric dipole are presented.

  284. FDTD Analysis of a Dipole Antenna in an Anisotropic Plasma

    CHEN Qiang, SATO Hiroyasu, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 97 (146) 25-28 1997/07/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    A dipole antenna in anisotropic plasma is analyzed by using the PML-FDTD method which has been improved to be applicable for the dispersive and anisotropic medium. The input impedance of a linear dipole antenna is evaluated numerically. The numerical results are compared with those of measurement to demonstrate the validity of the present method.

  285. Directivity of a Monopole Antenna on a Finite Ground Plane

    SAWAYA Kunio, CHEN Qiang

    IEICE technical report. Antennas and propagation 97 (120) 9-12 1997/06/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    A numerical analysis based on the moment method by Richmond is presented to clarify the relationship between the directivity of monopole antennas in the cases of a circular ground plane and an infinite ground plane. It is found that the horizontal directivity of the monopole antenna on the finite ground plane is about 6dB less than that in the case of the infinite ground plane. It is also shown that the directivity of the monopole antenna on the circular ground plane in the direction of the maximum radiation is almost the same to the horizontal directivity of the monopole antenna on the infinite ground plane when the radius of the ground plane is greater than 2.5 wavelengths and the monopole length is less than 0.25 wavelengths.

  286. Effects of Antenna Characteristics on Digital Mobile Communication System

    TAKAHASHI Morikatsu, CHEN Qiang, SAWAYA Kunio

    Proceedings of the IEICE General Conference 1997 (1) 17-17 1997/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  287. Estimation of magnetic substance characteristics by strip line method considering mismatching of line.

    戸花照雄, 陳強, 沢谷邦男

    電気関係学会東北支部連合大会講演論文集 1997 1997

  288. Analysis by FDTD method of microstrip antenna considering conductor loss.

    板垣智有, 陳強, 沢谷邦男

    電気関係学会東北支部連合大会講演論文集 1997 1997

  289. Numerical analysis of linear antenna on multilayer dielectric substrate using the moment method.

    八田和哉, 黄載こう, 陳強, 沢谷邦男

    電気関係学会東北支部連合大会講演論文集 1997 1997

  290. PML absorption boundary condition for dispersive and anisotropic mediums.

    佐藤弘康, 陳強, 沢谷邦男

    電気関係学会東北支部連合大会講演論文集 1997 1997

  291. Numerical Analysis of Radiation Efficiency of Loop Antenna for Pager

    SASAKI Makoto, CHEN Qiang, NAKAMURA Seizo, SAWAYA Kunio

    Proceedings of the Society Conference of IEICE 48 48-48 1997

    Publisher: The Institute of Electronics, Information and Communication Engineers

  292. A Compact Expression of Resonant Frequency of Planar Inverted F Antenna Based on Transmission Line Model

    Yuan Qiaowei, Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 1996 (1) 83-83 1996/09/18

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    The empirical formula f=c/4(L+W+H) (1) has been applied to determine the resonant frequency of the planar inverted F antenna(PIFA) shown in Fig.1. However, this formula can not take account of the effect of the location of the short-pin. In this report, the transmission line model (TLM) is applied to investigate the resonant frequency of a PIFA. An approximate expression for the resonant frequency which takes account of the position of the short-pin is established. The numerical results are compared with the experimental data.

  293. A Compact Expression of Resonant Frequency of Planar Inverted F Antenna Based on Transmission Line Model

    YUAN Qiaowei, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 96 (224) 31-38 1996/08/22

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    The resonant frequency of the planar inverted F antenna (PIFA) is calculated by solving a transcendental equation obtained by using the transmission line model (TLM). An alpproximated expression for the resonant frequency of the PIFA is developed from the transcendental equation. The validity of the approximated expression is confirmed by comparing the numerical results with experimental data.

  294. Moment Method Analysis of Monopole Antenna Mounted Near the Edge of a Conducting Plane

    SUGAWA Atsushi, CHEN Qiang, OCHI Hisaaki, YAMAMOTO Etsuji, SAWAYA Kunio

    Proceedings of the IEICE General Conference 1996 (1) 80-80 1996/03/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

  295. Analysis of Q-value of microstrip resonator using FDTD method.

    本間尚樹, 陳強, 沢谷邦男

    電気関係学会東北支部連合大会講演論文集 1996 1996

  296. Moment Method Analysis of Monopole Antenna Mounted near the Edge of a Conducting Plane

    SUGAWARA Atsushi, CHEN Qiang, OCHI Hisaaki, YAMAMOTO Etsuji, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 95 (311) 13-17 1995/10/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    When a problem of a wire antenna in the vicinity of the edge of a finite ground plane is analyzed by using the moment method, a wire/plate-junction segment has to be incorporated. However, the size of the junction segment is limited to be less than 0.1 wavelength. In this report, a joint patch segment is proposed to overcome this difficulty. Further now, the joint patch segment is divided into 8 segments to incorporate a variation of current distribution with respect to the azimuth direction. An analysis of a monopole antenna mounted near the edge of conducting plane with finite size is performed and the results are compared with experimental data confirming the validity of the present analysis.

  297. Moment Method Analysis of Antennas Composed of Conducting Wires and Plates : Introduction of a Joint Patch Segment

    OCHI Hisaaki, YAMAMOTO Etsuji, CHEN Qiang, SAWAYA Kunio

    IEICE technical report. Antennas and propagation 95 (311) 61-66 1995/10/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    In applying the moment method to the antennas having conducting wire/surface junctions, the radial surface segment is necessary to expand the current on the junction. However, it is not able to analyze antennas whose dimension of the surface is smaller than 0.2λ, because the dimension of the radial surface segment has to be chosen to be greater than 0.2λ. In this paper, a mehod to overcome the above problem by introducing a joint patch segment is proposed. Numerical results for the input impedance of antennas are compared with measured data confirming the validity of the proposed method.

  298. Accuracy of Analysis of Microstrip Line by FDTD Method

    Chen Qiang, Sawaya Kunio

    Proceedings of the Society Conference of IEICE 1995 (1) 91-91 1995/09/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  299. Small antenna for portable telephone with less effects on human body.

    松枝昭頼, 猪狩和久, 陳強, 沢谷邦男

    電気関係学会東北支部連合大会講演論文集 1995 1995

  300. フェロセン修飾β-およびγ-シクロデキストリンのゲスト識別能力

    陳強, 鈴木厳, 上野昭彦, 長哲郎

    日本化学会講演予稿集 60th (2) 1990

    ISSN: 0285-7626

  301. ダイオード装荷メタサーフェスによる指向性可変リフレクトアレーの設計と解析

    丸山珠美, 嶋野武, 陳強

    電子情報通信学会総合大会

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Books and Other Publications 3

  1. Antenna engineering handbook

    Qiang CHEN, Qiaowei YUAN

    McGraw-Hill 2018/12/04

    ISBN: 1259644693

  2. Handbook of Antenna Technologies

    Q. Chen, Q. Yuan

    Springer Singapore 2016/09

    ISBN: 981456043X

  3. ワイヤレス給電技術の最前線

    陳 強

    シーエムシー出版 2012

Presentations 1

  1. Antenna Design and Evaluation for 920 MHz Passive RFID Tag in Monitoring and Tracking System International-presentation Invited

    CHEN Qiang

    The 3rd International Conference on Intelligent Green Building and Smart Grid (IGBSG 2018)

Industrial Property Rights 10

  1. 無線通信システム、送信装置、及び、通信方法

    佐藤 弘康, 陳 強

    特許6714272

    Property Type: Patent

    Holder: 国立大学法人東北大学

  2. デュアルアンテナ装置

    丸山 珠美, 小田 泰弘, 李建峰, 袁 巧微, 陳強, 澤谷邦男

    5463577

    Property Type: Patent

  3. リフレクトアレイ

    丸山 珠美, 古野 辰男, 澤谷邦男, 陳強, 李建峰, 屈世偉, 袁 巧微

    5177708

    Property Type: Patent

  4. リフレクトアレイ

    丸山 珠美, 李 龍, 上林 真司, 古野 辰男, 陳 強, 袁 巧微, 澤谷 邦男

    5371633

    Property Type: Patent

  5. アンテナ装置

    諏訪 敦, 西村 太, 澤谷 邦男, 陳 強

    5046698

    Property Type: Patent

  6. 受信アレイアンテナ装置

    袁 巧微, 陳 強, 澤谷 邦男

    4453874

    Property Type: Patent

  7. アレーアンテナ

    田口裕二朗, 陳強, 澤谷邦男

    3435378

    Property Type: Patent

  8. 広帯域アレーアンテナ

    田口裕二朗, 陳強, 澤谷邦男

    3469834

    Property Type: Patent

  9. アレーアンテナ

    田口裕二朗, 陳強, 澤谷邦男

    3169325

    Property Type: Patent

  10. アンテナ装置

    陳 強, シュー ジュンイ

    Property Type: Patent

Show all Show first 5

Research Projects 33

  1. antenna on/in body Competitive

    System: Contract Research

    2014/04 - Present

  2. wireless power transfer Competitive

    System: The Other Research Programs

    2010/04 - Present

  3. reflectarray Competitive

    System: Funded Research

    2009/10 - Present

  4. Visualization of EM waves and its application in EMC Competitive

    System: Grant-in-Aid for Scientific Research

    1998/04 - Present

  5. Intellihent Antennas Competitive

    System: Contract Research

    1994/04 - Present

  6. Computational methods of electromagnetics and its applications Competitive

    System: Ordinary Research

    1989/04 - Present

  7. 高効率海中・海上混合電磁波伝送路の構築

    陳 強, 今野 佳祐, 佐藤 弘康, 高橋 応明, 石井 望, 袁 巧微, 吉田 弘

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 東北大学

    2023/04/01 - 2026/03/31

  8. 高効率海中・海上混合電磁波伝送路の構築

    陳 強, 今野 佳祐, 佐藤 弘康, 高橋 応明, 石井 望, 袁 巧微, 吉田 弘

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 東北大学

    2023/04/01 - 2026/03/31

  9. Beyond 5Gの無線技術の基盤となるエンドファイアリフレクトアレーの創成

    今野 佳祐, 藤井 勝巳, 陳 強, チャカロタイ ジェドヴィスノプ, 村上 靖宜

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(C)

    Category: 基盤研究(C)

    Institution: 東北大学

    2022/04/01 - 2026/03/31

    More details Close

    今年度は,線状モノポールアンテナを用いたエンドファイアリフレクトアレーの設計を行った.まず,入射波の入射角度,素子間隔,およびビーム走査方向の関係を解析的に明らかにした.次に,所望の方向に主ビームを有するエンドファイアリフレクトアレーを設計し,電磁界数値解析法であるモーメント法を用いてその散乱パターンを明らかにした.その結果,解析的に明らかにした通り,入射角度に応じて適切な素子間隔を与えると,所望の方向へ主ビームが出ることが分かった.また,10 GHz帯において設計したエンドファイアリフレクトアレーを試作し,その散乱パターンを電波無響室で測定した.測定した散乱パターンは数値解析結果とよく一致しており,エンドファイアリフレクトアレーの有効性を実験的に明らかにした.これらの研究成果は大学院生との共同研究の成果であり,電子情報通信学会のアンテナ・伝播研究会の企業・学生セッションにて発表された.研究内容が高く評価され,当該大学院生が優秀ポスター発表賞を受賞するに至った. 本研究の関連研究として,アンテナの効率的な数値解析法,電流分布推定法,およびアレーアンテナを用いた無線電力伝送法に関する研究を行った.これらの研究成果は学術論文にまとめられ,1件採録済み,2件は現在投稿中である.なお,アンテナの効率的な数値解析法に関する研究の一部は電子情報通信学会のアンテナ・伝播研究会のチュートリアル講演として発表された.このチュートリアル講演では,大規模な周期構造の数値解析法の利点や欠点など,関連研究の遂行に際して得られたノウハウが聴講者に共有された.

  10. Development of a pseudo-scale model experimental system for the use of radio waves under shallow water.

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Niigata University

    2022/04/01 - 2025/03/31

  11. Development of a pseudo-scale model experimental system for the use of radio waves under shallow water.

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Niigata University

    2022/04/01 - 2025/03/31

  12. 次世代徘徊検知システム用GPSに代わる発電する薄型インソールの研究開発

    Offer Organization: みやぎ産業振興機構

    System: Go-Tech事業

    Institution: ライフラボラトリ、東北大学、山形大学

    2024/04 - 2025/03

  13. 基地局端末間の協調による動的ネットワーク制御に関する研究開発

    Offer Organization: 総務省

    System: 電波資源拡大のための研究開発

    Institution: 東北大学、KDDI総合研究所、JDI、DNP

    2021/04 - 2025/03

  14. 高効率の無線電力伝送システムの開発

    陳 強, LI DAOTONG

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 特別研究員奨励費

    Institution: 東北大学

    2023/03/08 - 2024/03/31

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    無線電力伝送システムの伝送効率を向上するためには、システム内のアンテナやフィルターなどのコンポーネントの性能向上が非常に重要である。本研究では、高利得アンテナや高効率マイクロ波整流器、さらにシステムの小型化に関する研究が行われている。高利得アンテナについては、誘電体共振器アンテナとアレーアンテナの設計法に基づいた、広帯域で高利得なアンテナの研究が行われている。また、システムの小型化を実現するためには、高性能フィルタアンテナ技術の研究も行われている。さらに、整流効率向上のためには、マイクロ波の非線形回路理論に基づいた、広い周波数帯域でかつ広いダイナミックレンジを持つ高効率なマイクロ波整流回路の開発も行われている。 今年度の主な研究成果は以下のと通りである。(1) 誘電体共振器を用いた広帯域で高利得なアレーアンテナを提案し、アンテナ利得の向上とアンテナ帯域幅の拡大に成功し、遠隔地における高効率な無線電力伝送のシステムに適用している。(2) システムの小型化と一体化を実現するために、フィルタとアンテナを一体化し、フィルタ特性を備えた高利得アンテナの開発に成功し、送受電アンテナの利得と伝送効率を改善している。ここで使用されているアンテナは、平面レンズアンテナの技術と組み合わせることで、アンテナの利得が大幅に改善されている。(3) 高調波制御と電力の動的配分技術に基づき、広いダイナミックレンジにおいて、高効率、広帯域の整流器の設計法を提案している。 上記の研究成果について、8編のジャーナル論文にまとめられている。そのうち、3編の論文は採択決定済みで、2編は査読中で、残りの3編は執筆中である。

  15. 高効率の無線電力伝送システムの開発

    陳 強, LI DAOTONG

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: 東北大学

    2021/11/18 - 2024/03/31

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    高効率で広角度に渡って無線で電力を伝送するたえに、ビーム走査が可能な高利得で、高効率なアンテナの実現が重要である。本研究では、誘電体共振器のアンテナ設計手法とアレーアンテナの開口面合成理論に基づき、広角度、広帯域、高利得のアレーアンテナに関する研究を行った。その結果、以下の4つの研究成果を得た。(1)誘電体共振器の設計法に基づく広帯域、高利得アレーアンテナを提案しいる。(2)アンテナの広角ビーム走査のため、異なる誘電率の誘電体を負荷として設けることにより、機械的に広角なビーム走査を実現している。(3)高効率・広帯域のマイクロ波整流回路の設計法を用いることにより、1-6 GHzの周波数帯域において80%の高い整流効率を実現している。(4)アンテナとフィルタの設計技術を融合することにより、アンテナと整流回路と一体化したレクテナの設計法を検討し、小形で高効率なレクテナを実現している。これらの研究成果をまとめて、IEEE Transactions on Components Packaging and Manufacturing Technologyのジャーナル論文を1件投稿した。また、IEEE Transactions on Circuits And Systemsに2件の論文投稿を予定している。

  16. Technology Development of Radio Wave in Sea Water

    Chen Qiang

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2020/04/01 - 2023/03/31

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    In this study, to develop the technologies for radio wave applications in highly lossy media, specifically in the ocean, we clarified the wave propagation characteristics in sea water, and the design methods for antennas operating in sea water. We developed an underwater positioning method using low-frequency radio waves. Particularly, we achieved significant research results on the operation principles and design/measurement methods of the half-sheath dipole antennas and the half-sheath loop antennas, which incorporate an insulation structure between seawater and the antennas. We also developed a measurement method for evaluating the propagation loss in sea water using pseudo-scale model experiments that consider lateral waves on the sea surface. Additionally, we made progress in the development and improvement of underwater positioning algorithms taking into account lateral waves. These accomplishments have been published in numerous journal and conference papers.

  17. Development of Millimeter-wave Imaging System Using Incoherent Source

    Sato Hiroyasu

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2020/04/01 - 2023/03/31

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    Millimeter-wave passive imaging technology receives weak thermal noise in the millimeter-wave band emitted by humsn body and objects, and detects dangerous objects under clothing in a non-contact, non-invasive manner. As a problem of this passive imaging, it is difficult to judge the presence or absence of dangerous objects because the contrast of millimeter-wave images deteriorates due to the influence of thermal noise in the surrounding environment. Therefore, in this study, we investigated in detail how to improve the contrast between the human body and the object by millimeter-wave imaging using an incoherent irradiation source.

  18. アレーアンテナ素子間の減結合用合成回路の研究

    陳 強, XU KAIDA

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: 東北大学

    2019/11/08 - 2022/03/31

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    5G無線通信システムの基地局用準ミリ波アンテナとして、広帯域、高利得と広角度のビーム走査が可能な基地局Massive(大規模) MIMOアンテナが求められているが,アンテナ間の電磁結合のため,これらの性能の達成が極めて困難である.そこで本研究では、Massive MIMOアンテナ素子間の電磁結合を低減することにより、広帯域,高利得,広角度スキャンが可能なMassive MIMOアレーアンテナ設計の要素技術を確立する目的で、研究を進めている。本年度では、主に3つの研究成果を挙げている。 1つ目は、マイクロ波、ミリ波用広帯域バンドパスフィルタの研究である。アレーアンテナの給電回路にバンドパスフィルタを実装することにより、素子間干渉を低減する要素技術の確立を図った。その成果として、meander-line 共振器、結合型マイクロストリップリング、結合型マイクロストリップスタブ、及び表面プラズモン・ポラリトンの4つの構造で、バンドパスフィルタの実現に成功している。 2つ目は、プラズモン・ポラリトンを用いたバンドパスフィルタの設計に関する研究である。マイクロ波とミリ波の帯域においては、コプレーナ導波路上のプラズモン・ポラリトンを用いたバンドパスフィルタの設計方法について提案と検討を行っている。 3つ目は小形、高効率のテラヘルツ吸収技術の研究である。T型スロット形状のグラフェンとその補対構造を設計し、それによる電波吸収効果を確認している。 以上の三つの研究成果は10編の雑誌論文にとりまとめられており、2020年度に公表されている。

  19. A Study on Electromagnetic Field's Distribution Visualization of WPT system

    YUAN Qiaowei

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    2018/04/01 - 2022/03/31

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    Usually, the practical application of a wireless power transfer (WPT) system handles power of several watts to several thousand watts. The power used in WPT is much larger than that in wireless communication, therefore there are strong concerns from society regarding WPT applications’ safety. In this research, from the viewpoint of dispelling social concerns about the safety of WPT system, we attempted to visualize the electromagnetic field of the WPT system by combining electromagnetic field analysis, measurement technology and augmented reality AR (Augmented Reality) technology. At last, this research will help to grasp the distribution of electromagnetic fields around the WPT system in real time to accelerate the spread of the WPT technology and make the users to confirm the safety of the WPT system.

  20. Integrated resource management techniques in ultra-high-speed wireless network with body mounted antenna systems based on the information acquisition behavior using the human head and eye movement

    Maeda Tadahiko

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Ritsumeikan University

    2014/04/01 - 2017/03/31

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    Both broad-side and end-fire array antennas that can be mounted into a frame of eye glasses and finger-wearable ultra-wideband ring-type antennas have been proposed and investigated. Also, the radiation efficiencies of embroidered wideband dipole and slot antennas have been assessed with measurements including the effects of the human body using human equivalent phantoms. In order to improve the quality of body centric wireless communications, a polarization diversity antenna has been designed for Bluetooth wearable wireless devices. A 10 dB gain has been archived by using the polarization diversity technology and has been confirmed by experiments. Besides, a novel position-based routing protocol using directional antennas and a novel multicast forwarding scheme for mobile ad-hoc networks have been proposed and the effectiveness of the proposed approaches has been confirmed through both computer simulations and experiments using real wireless mobile devices.

  21. Research of MoM accelerated by using GPU

    YUAN QIAOWEI, KONNO Kesukei, SEINO Seito, MANDAI Koji

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Sendai National College of Technology

    2013/04/01 - 2017/03/31

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    This research makes it possible to implement moment method algorithm in GPU which was ever required by using the super computer with the very expensive cost. The developed moment method algorithm takes into account the large scale numerical analysis with the dielectrics. Definitely, it is hopeful that our electromagnetic analysis of a large model and acceleration algorithm can be applied to a lot of larger scale applications, such as a new artificial electromagnetic materials, space power generation systems, and communication, scattering / radiation problems including people, cars, ships and planes, and so on

  22. Research on design method of wireless power transfer system with high efficiency

    Chen Qiang, KONNO KEISUKE, YUAN QIAOWEI

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2013/04/01 - 2016/03/31

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    A approach was developed to calculate the scattering matrix of the antennas in the near-field wireless power transfer system in a complex environment by using the method of moments to design the system with the maximum power transfer efficiency, Loosy matching circuits were successfully designed to improve the impedance matching condition. A method was proposed to compensate the change of input impedance of the antennas to solve the problem of efficiency reduction due to the change of the relative distance and position between the transmitting and receiving antennas in the system. In the proposed system, a parasitic array with a impedance switch in each array element is electrically controlled.

  23. On-body Relay Antenna System for Mobile Communication Handsets

    CHEN Qiang

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2011 - 2012

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    Multi-Input Multi-Output (MIMO) technology is one of the most important technologies to be required in high-speed wireless communications of the next-generation. However, it is difficult to mount so many antennas in a mobile handset of small size. In this research, it is proposed that the multi-antennas are mounted not in the handset, but on the human body. The MIMO transmission capacity using the proposed on-body antennas are evaluated by full-wave numerical simulation and measurement, demonstrating the performance of the proposed antenna system.

  24. Research on Phase Measurement of EM Wave Using Modulated Probe Array

    CHEN Qiang

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2007 - 2008

  25. 電磁界数値解析の高速計算法の研究

    陳 強, ZHAI Huiqing

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: 東北大学

    2006 - 2007

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    モーメント法は金属導体からなるアンテナの数値解析手法として大変有効であり広く使われているが,誘電体近傍のアンテナ解析への適用が困難だとされている.受入研究者の研究グループは過去に提案した分極電流ブロックモデルのモーメント法は誘電体近傍のアンテナ解析への適用が可能であるが,3次元の誘電体を解析する場合は膨大な計算時間がかかるとの問題点が残っている.本研究では,昨年度まで提案してきた高速な数値解析法を分極電流ブロックモデルのモーメント法に適用する研究を行ない,計算時間の短縮を図り,モーメント法の適用範囲を一層広げることを目的としている. 本年度の研究では,従来の提案法を分極電流ブロックモデルのモーメント法に適用し,3次元の誘電体を解析するモーメント法の高速化を図った.モーメント法の基底関数とする直方体のダイポール間の自己・相互インピーダンスを解析的に求めるために,モノポールの端部電荷を考慮した線状モノポール間の自己・相互インピーダンスの定式化を行い,過去の研究で与えられた式と比較し,端部電荷の有無と定式化との関係を数学と物理の両面から議論した.また,端部電荷を含めた線状モノポール間の自己・相互インピーダンスから,直方体モノポールセグメント間の自己・相互インピーダンスを導出し,式に含まれる5重積分の単積分を行った.最後に,数値計算例から,定式化されたモノポールセグメントの自己・相互インピーダンスの妥当性と計算時間の短縮化効果を検証した.さらに,誘電体を含めたアンテナのモーメント法解析を行い,本手法の妥当性と有効性を示した. 本研究成果は,IEICEの論文誌2008年9月号「高速無線通信を支えるアンテナ・伝搬技術特集号」の招待論文に引用され,掲載される予定である.

  26. Development of Adaptive Array Antenna for Mobile Handsets

    SAWAYA Kunio, CHEN Qiang, SATO Hiroyasu

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2005 - 2007

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    With the recent development of high-speed communications network, high-speed wireless communication system is also desired. However, it is difficult to obtain high-speed wireless system because of the limitation of frequency resources. In order to overcome this difficulty, application of adaptive array antenna system to mobile handsets is required. In the present research, mutual coupling among antennas mounted on a mobile handset has been analyzed and compensation technique of the mutual coupling has been developed. Limitation of the suppression of interference signal in the case of adaptive array antenna for mobile handsets has been also investigated. 1. Compensation of mutual coupling among antennas mounted on mobile handset For the compensation of mutual coupling, a method, in which the data of mutual coupling are calculated and stored to obtain the array element pattern, has been developed. Numerical simulation of DOA (direction of arrival) estimation using array antennas composed of a monopole antenna and an inverted planar F-shaped antenna and experiments are performed confirming the validity of the proposed method. 2. Investigation of limitation of interference suppression performance Performance of interference suppression is evaluated by using a W-CDMA receiver for 4 element adaptive array antenna at 2.45 GHz, which was developed by the present investigators. Experiment using 4 element monopole array antenna for line-of-sight and non-line-of-site propagation paths shows that a quarter wavelength array spacing is enough to suppress the interference for the case of line-of-sight. On the other hand, the array spacing should be longer than a half wavelength when the propagation path is non-line-of-site. Experimental investigation of the performance of interference suppression for a receiver having frequency domain equalizer for 2 element array antenna has been also performed.

  27. Research on Electromagnetic Measurement System Using Modulated Scattering Elements

    CHEN Qiang

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2005 - 2006

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    It is required to measure the radiation efficiency of antennas of mobile phones and PHS accurately and rapidly, because the electromagnetic radiation from the antenna is partially observed by user's human body. In this research, a simultaneous measurement method using the parallel modulation technique has been proposed. The modulated probe element and the measurement system for radiation efficiency measurement have been developed for commercial use. 1. Accuracy improvement of the system. A directive antenna composed of a dipole and a reflector has been developed to increase the gain of the receiving antennas and improve the measurement accuracy. The frequency of local signal has bee adjusted to decrease the noise caused by the modulation. Furthermore, the mutual coupling analysis has been carried out to optimize the location of the probe array. 2. Broad bandwidth design of the system. The probe array has been designed to meet the requirement of the bandwidth of 800MHz-2.8GHz. 3. A 3-D antenna radiation measurement system has also been developed. The radiation efficiency of antennas has been measured by the system and the measurement results have been compared with the numerical results. It has been demonstrated that radiation efficiency of antennas can be measured rapidly with a satisfactory accuracy in about 16 seconds. 4. Phase measurement. It has been studied how to measure the phase information of the electromagnetic field. However, the investigation has found phase measurement difficult because of the delay effect of the feeding cables and modulation circuits of each probe. This part of research becomes the future work of challenge.

  28. Research on Evaluating Noise Location with High Resolution by Field-Scanning on Closed Surface

    SAWAYA Kunio, SATO Hiroyasu, CHEN Qiang

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2002 - 2003

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    In this research, methods to estimate the location of the source with high resolution have been established to find the undesired radiation sources in the electrical and electronic devices which affect the performance of the other devices and cause the serious interference problem. First, a method to determine the coefficient of power series of the spherical expansion modes has been investigated to obtain a high resolution especially at low frequency. The effect of the mutual coupling between the array elements on the resolution has also been studied to obtain the information on source location with high resolution by using the MUSIC algorithm. Next, the sources of undesired radiation from a printed circuit board have been estimated by using the improved planar scanning technique. Then, a method of measuring the radiation pattern of the electromagnetic source has been proposed by using the modulated scattering elements. The measurement system has been established which can be used to measure the amplitude of the electromagnetic wave in several points simultaneously. Moreover, the near field measurement without disturbing the current distribution on the electromagnetic source has been developed. The amplitude of the undesired electromagnetic wave from the noise sources can be accurately measured by using this method. The experiment has been performed to show the effectiveness of the method.

  29. 電子機器のプリント基板上の電流分布の可視化

    陳 強

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 若手研究(B)

    Category: 若手研究(B)

    Institution: 東北大学

    2002 - 2003

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    14年度では時間領域差分法を用いた誘電体基板上の電流分布を推定する方法を確立し,シミューレーションにより電子機器のプリント基板上の電流分布を可視化する可能性を示したことに続き,15年度では以下のような研究実績を得ている. 1.可視化システムの作成 近傍電磁界め測定システムを構築し,時間領域差分法を用いた誘電体基板上の電流分布の推定アルゴリズムと組み併せて,アンテナ上の電流分布及び,電子機器のプリント基板上などの電流分布の可視化システムを作成した. 2.可視化システムの評価 完成した電磁波可視化システムを用いて,アンテナ上の電流分布及びプリント基板上の電流分布を可視化し,システムの評価を行なった.電流分布の展開関数の配置方法や,電界の測定の走査範囲,電界プローブの電気特性などの測定パラメータが可視化の精度に与えた影響を明らかにし,これらのパラメータの最適化の指針を与えた. 3.可視化システムの高性能化 時間領域差分法の数値計算アルゴリズムを改善することにより,高速化を図った.その結果,従来電流分布の展開関数の数だけ,時間領域差分法の数値計算を繰り返ななければならなかったことに対して,1回の計算で済むことになった,また,本システムの電磁界走査の高速化を実現するために,リアルタイムで多数の地点における電磁波が測定可能な変調散乱素子を用いた測定法を開発し,測定システムを構築した.さらに,本システムの高精度化を図るため,変調散乱素子を用いて被測定電磁界分布を乱さないような無浸襲で近傍電磁界の測定法も提案しており,基礎実験を行ない,良好な結果を得た.

  30. STUDY ON MEASUREMENT METHOD OF POWER ABSORPTION BY HUMAN BODY IN THE VICINITY OF PORTABLE TELEPHONE

    SAWAYA Kunio, IGARI Kazuhisa, CHEN Qiang

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: TOHOKU UNIVERSITY

    1998 - 1999

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    It is very important to measure the absorbed power by human body in the vicinity of radio equipments such as the portable telephones and the personal handy phone systems (PHS) when designing antennas. In this research project, a method based on the pattern integration method for measuring the power absorption by the human body in the vicinity of antenna, in which the antenna and the human model are rotated along azimuth direction and the receiving antenna is rotated along the elevation direction, has been proposed and following results have been obtained. (1) The radiation efficiency of the half-wavelength dipole antenna has been measured by using the proposed method and compare with the results by the random field method. It has been shown that the accuracy of the proposed method is higher than that of the random field method. (2) High-speed and automatic measuring system has been developed by controlling the rotators by personal computer. (3) The radiation efficiency of the half-wavelength dipole antenna and a monopole antenna mounted on the body of portable telephone in the vicinity of the COST 244 head phantoms has been measured. The results have been compare with the numerical results obtained by the FDTD (Finite Difference Time Domain) method confirming the validity and the high accuracy of the propose method. It has been also pointed out that the absorption power of the spherical phantom is smaller than that of the cubic phantom. (4) A monopole array antenna based on the principle of the Yagi-Uda antenna and a low-profile loop array antenna have been designed to reduce the absorbed power by using the FDTD method. It has been confirmed numerically and experimentally that the radiation efficiency of the designed antennas is higher than the usual monopole antenna.

  31. 電子装置からの電波放射の可視化に関する研究

    陳 強

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究(A)

    Category: 奨励研究(A)

    Institution: 東北大学

    1997 - 1998

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    1. 可視化プログラムの計算時間の短縮化 可視化画像の高い解像度を得るため,高次の球面波モード関数の計算が必要となり,可視化プログラムを実行するには膨大な計算時間が必要になる.そのため,本年度では球面波モード関数の次数と可視化の誤差との関係を定量的に調べ,最低限の次数を用いて,高精度の可視化を実現した. 2. 球面走査の高速化 球面走査で測定した電界強度のデータがGPIBインターフェースでパソコンに取り込まれる.従来では,プローブを球面上にある場所に移動し,そこで測定した電界強度のデータを転送してから,プローブを次の測定位置に移動するという断続的な測定法を使用していた.そのため,一回当たりの測定時間が2時間30分となっていた.今年度は,プローブを連続に球面上に走査させ,測定点の位置情報を測定した電界強度のデータと共にパソコンに取り込むようにに測定制御システムを変えた.また,測定後データ処理によって,一定な間隔おきに電界の測定データの採出を行うことにした.これによって,一回当たりの測定時間は40分と大幅に短縮された. 3. 電磁界走査の測定ノイズと可視化精度との関係の検討 球面上の遠方電磁界を測定するとき,測定機のネットワークアナライザの熱雑音がノイズとして測定信号に混入する.近傍電磁界を推定すると,混入されたノイズが大きく増幅され,推定される電磁界分布に現れる.そのため,測定ノイズと可視化精度との関係を定量的に調べた.その結果から,ネットワークアナライザのダイナミックレンジから,近傍電磁界の誤差を予め予測できるようになった. 4. 可視化の応用 完成した電磁波可視化システムを用いて,ダイポールアンテナ,スロットアンテナ,八木・宇田アンテナなどの近傍電磁界分布を可視化し,システムの評価を行い,可視化システムの高精度とその実用性が確認できた.

  32. 高誘電率基板上のアンテナとマイクロストリップ線路の設計法の研究

    陳 強

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究(A)

    Category: 奨励研究(A)

    Institution: 東北大学

    1996 - 1996

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    本研究は高誘電率の誘導体基板上のアンテナとマイクロストリップ線路の設計法を確立することを目的として行った.具体的には,ガラーキン・モーメント法及びスペクトル領域法を用いて解析を行い,精度の向上を図った.また,FDTD法を高い誘電率の誘電体に適応したときに精度が低下する原因を調べ,その改善を図った. 1.ガラーキン・モーメント法およびスペクトル領域法を用いて,高誘電率の誘電体基板上のマイクロストリップ線路の解析を行った.二つの手法を適用する際,表面波を表すポールにおける波数に対する積分の収束問題を解決した.また,波数に対する無限積分にも収束しにくい部分を取り除き,解析的に求めることにより,収束性を改善しました. 2. FDTD法を用いて同様な解析を行い,従来のセルサイズの基準に代わる新たな基準を明らかにした.高誘電率の基板を有するマイクロストリップ線路を解析する場合は,マイクロストリップラインの形状によってセルの大きさの基準は変わり,最も短い波長の約1/100以下に分割しなければならないことがわかった. 3.数値解析の妥当性を示すため,実験を行った.高誘電率の誘電体基板上にアンテナを試作し,アンテナの入力インピーダンスと放射指向性を測定した.得られた実験結果を数値解析結果と比較し,各解析法の解析精度を明らかにした. 4.FDTD法を用いて超伝導アンテナおよび高周波デバイスの設計用の数値シミュレーションCADを完成した.本CADは任意形状を持つ超伝導アンテナに適用ができ,しかも任意分散性の媒質にも使用できる.また,ガラーキン・モーメント法およびスペクトル領域法を用いたCADは平行素子を持つアンテナアレーなどの数値計算できる段階に至っている.

  33. 携帯無線装置用アンテナの放射効率の測定法に関する研究

    陳 強

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究(A)

    Category: 奨励研究(A)

    Institution: 東北大学

    1995 - 1995

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    本研究は、人体近傍に置かれたアンテナの放射効率を、放射電力積分法を用いて実験的に求めるためのシステムを提案することを目的として行った.この方法を適用するにあたっては,被測定アンテナ(送信アンテナ)を取り囲む閉曲面上でプローブアンテナ(受信アンテナ)を走査させるための装置が必要になるという問題がある.そこで本研究では,ターンテーブルと,今回試作したベ-クライト製の直径120cm程度のアーチレールを用いて,球面走査を実現させることにより,放射電力積分法を簡便に適用することを可能にした. そこで,このアーチレールを含めて構成した測定系および測定方法の妥当性について検討を行うために,試作した測定装置を用いて,周波数1500MHzにおいて,自由空間中におかれた半波長ダイポールアンテナからの放射電力を測定した.その結果,測定装置の限界の範囲においては,妥当な結果が得られた. 次に,この半波長ダイポールアンテナの近傍に人体モデル(生理食塩水入りファントム)を配置したときの放射効率を,放射電力積分法を用いて測定した.また,FDTD法(有限差分時間領域法)を用いた数値解析によるシミュレーションを行い実験値との比較をした.その結果,計算値と実験値は一致することが明らかになり,放射電力積分法,および試作した測定装置は,人体近傍に置かれたアンテナの放射効率を求めるためには有効である事を確認した.

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Social Activities 5

  1. 科学者の卵養成講座

    2009/09 - Present

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    科学者の卵養成講座 研究実習

  2. 科学者の卵 養成講座

    2009/04 - Present

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    当プログラムは、東北大学の理科系研究科が参画し、高校生であるみなさんの支援にあたります。 「日常の不思議」を発見する力と、その不思議を解析する力を養います。 内容をまとめて、プレゼンテーション出来る能力を育てます。 科学英語を読み解く力を養います。 科学に対する興味の向上・高揚を図ります。

  3. 楽しいサイエンスサマースクール

    2003/04 - Present

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    私たちは、これからの未来を拓く若者たちに「科学する心」を持ってほしいと考えています。そのためには少年期から科学的な探求の面白さを実感し,独創性、チャレンジ精神を育むことが極めて重要です。そこで、東北大学、東北学院大学、宮城教育大学、宮城高専の電気・情報系教官の有志からなる「たのしい科学企画委員会」を組織し、財団法人国際コミュニケーション基金の協賛を得て、中学生を対象にした「たのしいサイエンス・サマースクール」を平成6年から開催してまいりました。「光とエレクトロニクス」と題して、光と電波を用いた通信やロボットの制御などのおもしろい実験を多数準備しています。

  4. 漁業無線局、3局に集約 宮城沿岸カバー可能

    2014/03/15 -

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    東日本大震災で甚大な被害を受けた宮城県沿岸の漁業用海岸無線局11局について、東北総合通信局の有識者検討会は14日、「高出力で広域をカバーする3局に集約するべきだ」とする報告書をまとめた。今後、宮城県、県漁協と実現に向けた協議を始める。 報告書では集約先として既存の唐桑(気仙沼市)、牡鹿(石巻市)、亘理(亘理町)を挙げた。送信出力を現在の1ワットから5ワットに増強することで、3局でも宮城県の沿岸全域をカバーできると判断した。 宮城県沿岸で操業する漁船と交信する海岸無線局は、各漁協が独自で運営している。津波で5局が廃止または運用停止となっており、現在は新設の亘理を加えた7局が稼働している。 検討会は各地の漁協幹部や無線の専門家15人で構成し、陳強東北大大学院教授(電磁波工学)が座長を務める。昨年7月から漁業者の意見聴取や集約候補の3局で電波を飛ばす実験を進めてきた。 国は、全国の海岸無線局

  5. 海岸局再生へ希望の電波 総務省が宮城・亘理で高出力実験

    2013/11/14 -

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    東日本大震災で壊滅的な打撃を受けた宮城県沿岸の漁業用海岸局の本格復旧に向けて、総務省の実証試験が13日、亘理町で2日間の予定で始まった。震災前12局あった海岸局は、3局に統廃合し送信出力を上げて沿岸全域をカバーすることが検討されており、実際に電波を飛ばして実現の可能性を試した。 同町荒浜にある町営温泉施設「わたり温泉鳥の海」(被災し休止中)の地上約40メートルの屋上に、高さ最大10メートルのアンテナ2本を設置。従来の5倍の出力5ワットで約6キロ沖合を航行する実験船に電波を発射し、無線機で交信を行い電波の強さを測定した。 県内で操業する漁船と交信する海岸局は震災前、各漁協が独自で運営していた沿岸漁業用の11局と遠洋、近海漁業用の県漁業海岸局(石巻市)があった。しかし、津波で唐桑(気仙沼市)を除いて被災し仮復旧は5局にとどまっている。 本格復旧に向け、総務省はことし7月に調査検討会を設立。

Other 16

  1. 液剤中における電磁界ばく露評価用光電磁界プローブの高感度化に関する研究

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    携帯無線や無線電力伝送等、無線を利用した機器の電波防護指針適合性評価に使用する光電磁界プローブに対して、高感度化するためのプローブ構造や測定手法について検討する。 ア 液剤中における光電磁界プローブの高感度化及びシステム製作 イ 光電磁界プローブを用いた測定手法の不確かさ評価

  2. 氷下通信・測位ネットワークに関する基礎研究

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    北極研究においては、氷下の調査研究が非常に重要であるが、氷に閉ざされた空間の調査は容易ではない。氷下観測プラットフォームとして予てより自律型無人探査機(AUV)が候補にあげられているが、無補給で千キロメートルを超える航行を行う技術はもとより、氷下での通信・測位技術が確立されておらず、AUVの実用化が困難となっている。 本研究においては、海氷下においてAUV等のプラットフォームを利用する場合に、母船と海氷下の通信ならびに海氷下の測位を行うために、電磁波等の新たな波動技術の適用可能性を実験的に研究する。最終ゴールは氷下通信・測位のネットワーク構築であり、本研究では、新たな波動技術の適用性についてGO/NOGO判断を行う。

  3. JST COIプログラム 電波伝搬モデリング技術の開発

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    電波伝搬モデリング技術の開発

  4. 超高速移動通信システムの実現に向けた要素技術の研究開発

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    イ 電波伝搬環境改善技術の研究開発 (a) 反射特性制御装置の開発 (1) リフレクトアレー反射特性制御装置の開発 これまでは反射板付プリントダイポールなどの散乱素子を周期的に配列した無限周期アレーに平面波が垂直入射した場合の散乱波の位相特性を求め,その結果に基づいて反射装置(リフレクトアレー)を設計してきた.この設計により所望の方向に電波を散乱するリフレクトアレーが得られることを確認している.また,反射板の代わりにループアレーを反射板とすることにより,特定の周波数の電波を所望方向に散乱させ,それ以外の周波数の電波は透過させることができることを示し,その有効性を確認した.しかしながら,この設計では散乱方向に限界があり,より広角に散乱させるためには新たな設計法の導入が必要である.また,このようにして設計されたリフレクトアレーはその動作帯域幅が狭いという課題を有している.さらに,ループアレーを反射板として用いることにより周波数選択性を達成してきたが,その周波数特性には改善の余地が残されていた. そこで本研究では,より広角に散乱させるための新たな設計法の確立を図る.具体的には,第1段階として上記の無限周期アレー構造に基づいた設計を行って大まかなリフレクトアレーの構造を求め,次に第2段階としてこの設計で得られた有限の大きさのリフレクトアレーの散乱特性を求め,各散乱素子の構造を最適化する.これにより,広角散乱が可能な反射装置を開発できるものと考えられる.また,リフレクトアレーの広帯域化を図るために,散乱素子の構造や反射板と散乱素子の間隔などを最適化する.さらに,ループアレー以外の構造を用いた反射板についても検討することにより,周波数特性の改善を図る. 次に,上記の設計によって得られた反射装置の有効性を確認するために,これを試作して電波無響室等の実験環境でその特性を測定する。また、実際の環境においても測定を行い、実用性を検証する。さらに,計算機シミュレーションによりブースタや小型基地局、リレー、分散アンテナシステム等を用いた場合の特性を求め,反射装置の特性と比較してそれぞれの適用領域等を明確にする。 上記の設計法では与えられた入射角と散乱角に対して個別に設計することになる.しかしながら,これを実用化する際には,製作された反射装置の散乱方向を制御できることが望ましい.そこで,散乱方向を自由に制御する手法として,散乱素子にリアクタンスを負荷し,その値を調整する方法を検討する.これが成功すれば,1種類のリフレクトアレーで任意の入射角と散乱角に対応できるので,その製作コストの大幅の低減を図ることが可能となる.

  5. 超高速移動通信システムの実現に向けた要素技術の研究開発

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    イ 電波伝搬環境改善技術の研究開発 (a) 反射特性制御装置の開発 (1) リフレクトアレー反射特性制御装置の開発 これまでは反射板付プリントダイポールなどの散乱素子を周期的に配列した無限周期アレーに平面波が垂直入射した場合の散乱波の位相特性を求め,その結果に基づいて反射装置(リフレクトアレー)を設計してきた.この設計により所望の方向に電波を散乱するリフレクトアレーが得られることを確認している.また,反射板の代わりにループアレーを反射板とすることにより,特定の周波数の電波を所望方向に散乱させ,それ以外の周波数の電波は透過させることができることを示し,その有効性を確認した.しかしながら,この設計では散乱方向に限界があり,より広角に散乱させるためには新たな設計法の導入が必要である.また,このようにして設計されたリフレクトアレーはその動作帯域幅が狭いという課題を有している.さらに,ループアレーを反射板として用いることにより周波数選択性を達成してきたが,その周波数特性には改善の余地が残されていた. そこで本研究では,より広角に散乱させるための新たな設計法の確立を図る.具体的には,第1段階として上記の無限周期アレー構造に基づいた設計を行って大まかなリフレクトアレーの構造を求め,次に第2段階としてこの設計で得られた有限の大きさのリフレクトアレーの散乱特性を求め,各散乱素子の構造を最適化する.これにより,広角散乱が可能な反射装置を開発できるものと考えられる.また,リフレクトアレーの広帯域化を図るために,散乱素子の構造や反射板と散乱素子の間隔などを最適化する.さらに,ループアレー以外の構造を用いた反射板についても検討することにより,周波数特性の改善を図る. 次に,上記の設計によって得られた反射装置の有効性を確認するために,これを試作して電波無響室等の実験環境でその特性を測定する。また、実際の環境においても測定を行い、実用性を検証する。さらに,計算機シミュレーションによりブースタや小型基地局、リレー、分散アンテナシステム等を用いた場合の特性を求め,反射装置の特性と比較してそれぞれの適用領域等を明確にする。 上記の設計法では与えられた入射角と散乱角に対して個別に設計することになる.しかしながら,これを実用化する際には,製作された反射装置の散乱方向を制御できることが望ましい.そこで,散乱方向を自由に制御する手法として,散乱素子にリアクタンスを負荷し,その値を調整する方法を検討する.これが成功すれば,1種類のリフレクトアレーで任意の入射角と散乱角に対応できるので,その製作コストの大幅の低減を図ることが可能となる.

  6. 安全・安心な社会のための犯罪・テロ対策技術等を実用化するプログラムーミリ波パッシブイメージング装置の開発と実用化

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    空港等の高度の保安対策を要する拠点における、テロ・ 破壊工作等を未然に防ぐための、危険物検知システムとし て、ミリ波パッシブイメージング装置の小型化、軽量化、 高画質化を図るとともに、空港保安検査場等の設置余地を 考慮し、既設装置との併設あるいは一体化が可能な装置を 開発する。製品化は基本性能を向上させ随時進める。分解 能と装置サイズの関係をもとに、空港保安等を担う関係機 関の要望、プライバシーの問題を相互に配慮した装置を実 用化する。また、金属探知機との一体化が容易な壁型装置 等の開発を進めるとともに、二次的な検査を目的としたハ ンディー型装置の開発を進める。最終的に、開発した装置 の量産化・低コスト化を実現することを目標とする。

  7. 超高速移動通信システムの実現に向けた要素技術の研究開発

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    イ 電波伝搬環境改善技術の研究開発 (a) 反射特性制御装置の開発 (1) リフレクトアレー反射特性制御装置の開発 これまでは反射板付プリントダイポールなどの散乱素子を周期的に配列した無限周期アレーに平面波が垂直入射した場合の散乱波の位相特性を求め,その結果に基づいて反射装置(リフレクトアレー)を設計してきた.この設計により所望の方向に電波を散乱するリフレクトアレーが得られることを確認している.また,反射板の代わりにループアレーを反射板とすることにより,特定の周波数の電波を所望方向に散乱させ,それ以外の周波数の電波は透過させることができることを示し,その有効性を確認した.しかしながら,この設計では散乱方向に限界があり,より広角に散乱させるためには新たな設計法の導入が必要である.また,このようにして設計されたリフレクトアレーはその動作帯域幅が狭いという課題を有している.さらに,ループアレーを反射板として用いることにより周波数選択性を達成してきたが,その周波数特性には改善の余地が残されていた. そこで本研究では,より広角に散乱させるための新たな設計法の確立を図る.具体的には,第1段階として上記の無限周期アレー構造に基づいた設計を行って大まかなリフレクトアレーの構造を求め,次に第2段階としてこの設計で得られた有限の大きさのリフレクトアレーの散乱特性を求め,各散乱素子の構造を最適化する.これにより,広角散乱が可能な反射装置を開発できるものと考えられる.また,リフレクトアレーの広帯域化を図るために,散乱素子の構造や反射板と散乱素子の間隔などを最適化する.さらに,ループアレー以外の構造を用いた反射板についても検討することにより,周波数特性の改善を図る. 次に,上記の設計によって得られた反射装置の有効性を確認するために,これを試作して電波無響室等の実験環境でその特性を測定する。また、実際の環境においても測定を行い、実用性を検証する。さらに,計算機シミュレーションによりブースタや小型基地局、リレー、分散アンテナシステム等を用いた場合の特性を求め,反射装置の特性と比較してそれぞれの適用領域等を明確にする。 上記の設計法では与えられた入射角と散乱角に対して個別に設計することになる.しかしながら,これを実用化する際には,製作された反射装置の散乱方向を制御できることが望ましい.そこで,散乱方向を自由に制御する手法として,散乱素子にリアクタンスを負荷し,その値を調整する方法を検討する.これが成功すれば,1種類のリフレクトアレーで任意の入射角と散乱角に対応できるので,その製作コストの大幅の低減を図ることが可能となる.

  8. 宇宙太陽発電システム用大規模アレーアンテナの設計法の研究(その3)

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    平成19年度委託契約「宇宙太陽発電システム用大規模アレーアンテナの設計法の研究(その2)」の成果であるインピーダンス拡張法をフェーズドアレーアンテナ,及び2次元配列フェーズドアレーアンテナへも適用出来るように改良する. フェーズドアレーアンテナ,及び2次元配列フェーズドアレーアンテナのパターン解析すること.

  9. 伝搬環境改善EBG材料の設計と解析に関する研究

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    (1)正規反射以外の方向に二次放射させるEBG反射板について設計法を確立 (2)動作メカニズムの検証を行い、電界強度、入射角、反射角などの限界値、能力値を明らかにする。 (3)実際に高誘電材料などを用いてものをつくり、効果を実証する。 (4)周波数選択性との同時実現検討 (5)高性能化検討 (6)試作品作成 (7)権利化、外部発表(連名)

  10. モーメント法を用いたアレーアンテナのシミュレーション技術の研究

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    モーメント法を用いたアレーアンテナのシミュレーション技術の研究

  11. 宇宙太陽発電システム用大規模アレーアンテナの設計法の研究(その2)

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    電流分布拡張法の適用範囲の拡大 本学は、平成18年度委託契約「宇宙太陽発電システム用大規模アレーアンテナの設計法の研究」の成果である電流分布拡張法を一様分布以外のアレーアンテナへも適用出来るように改良する。 電流分布拡張法の精度の検討 本学は、4.3.2で適用範囲を拡大した電流分布拡張法の精度の検討を行う。 実用システム用送信アンテナのアンテナパターンの解析 本学は、表1に示す実用システムの送信アンテナに相当する大規模アレーアンテナのアンテナパターンを解析する。尚、開口面分布はガウシアンとする。

  12. 変調プローブアレーを用いた電波測定法の研究

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    変調プローブアレーを用いた電波測定法の研究

  13. 宇宙太陽発電システム用大規模アレーアンテナの設計法の研究

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    大規模アレーアンテナ設計法の作成 本学は真空中に配置した1万素子程度のアレーアンテナの電流分布より、億単位の素子を有する大規模なアレーアンテナの電流分布を推定し、アンテナパターンを算出する大規模アレーアンテナの設計法を作成する。 大規模アレーアンテナ設計法の精度の検討 本学は4.3.2で作成した大規模アレーアンテナ設計法の精度の検討を行う

  14. 宇宙太陽発電システム用大規模アレーアンテナの電流分布の研究

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    4.3.2 大規模アレーアンテナ素子の電流分布の解析 本学はモーメント法により、真空中に配置した1万素子程度のアレーアンテナの解析を行い、電流分布を明らかにする。 4.3.3 解析の高速化/メモリ削減の検討 本学はより大規模なアレーアンテナの解析を可能にする為に、モーメント法の高速化、計算機メモリの削減の検討を行う。

  15. 宇宙太陽発電システム用大規模アレーアンテナの研究

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    4.3.2 大規模アレーアンテナのアンテナ特性の解析 モーメント法により、真空中に配置した1万素子程度のアレーアンテナの解析を行い、アンテナ特性を明らかにする。 4.3.3 解析の高速化の伝送検討 より大規模なアレーアンテナの解析を可能にする為に、モーメント法の高速化の検討を行う。

  16. インテリジェントコミュニケーションインターフェース

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    インテリジェントコミュニケーションインターフェース

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