Details of the Researcher

PHOTO

Takashi Shiba
Section
Research Institute of Electrical Communication
Job title
Specially Appointed Professor(Research)
Degree

  • 博士（工学）（東北大学）

  • 工学修士（東北大学）

Research Areas 2

  • Informatics / Software /

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

Papers 42

  1. Regeneration of RF Spectrum Using Direct RF Undersampling Method and Its Application for Channel Model Measurement Invited Peer-reviewed

    SHIBA Takashi, FURUICHI Tomoyuki, AKIMOTO Kohei, MOTOYOSHI Mizuki, KAMEDA Suguru, CAINELLI Gustavo Pedroso, Müller Sven, GAMBAL Bodo, KRANEFELD Nils, OHORI Fumiko, OSUGA Toru, PERSICO Giuliano, UNDERBERG Lisa, ITAYA Satoko, SUEMATSU Noriharu

    J108-C　(1)　3-12　2025/01/01

    DOI： 10.14923/transelej.2024mwi0001 　

    eISSN： 1881-0217

    More details Close

    Miniature size, low cost, wideband and real-time spectrum monitor using direct RF undersampling technology has been developed. Regeneration method of RF complex spectrum by using compressed sensing technology has been also proposed. We also apply these technologies to two types channel model measurements. We also propose improved method using reference signal for two type channel models. The obtained channel model data are reasonable at the physical points of view.

  2. Proposal of Channel Model Measurement Method Under Local 5G System Operation Peer-reviewed

    Takashi Shiba, Tomoyuki Furuichi, Gustavo Cainelli, Sven Müller, Bodo Gambal, Nils Kranefeld, Fumiko Ohori, Toru Osuga, Giuliano Persico, Lisa Underberg, Satoko Itaya, Noriharu Suematsu

    2024 IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS)　1-5　2024/08/21

    Publisher: IEEE

    DOI： 10.1109/apwcs61586.2024.10679287 　

  3. Power Delay Profile Measurement Applied MUSIC for Local 5G System Peer-reviewed

    Takashi Shiba, Tomoyuki Furuichi, Noriharu Suematsu

    2023 6th World Symposium on Communication Engineering (WSCE)　49-55　2023/09/27

    Publisher: IEEE

    DOI： 10.1109/wsce59557.2023.10365776 　

  4. Measurement of Power Delay Profile for Local 5G System Peer-reviewed

    Takashi Shiba, Tomoyuki Furuichi, Noriharu Suematsu

    2023 XXXVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)　1-4　2023/08/19

    Publisher: IEEE

    DOI： 10.23919/ursigass57860.2023.10265413 　

  5. Real-Time Wideband Spectrum Monitor Using Multiple Sampling Frequency Direct RF Undersampling for Wireless IoT Peer-reviewed

    T. Shiba, T. Furuichi, K. Akimoto, M. Motoyoshi, S. Kameda, N. Suematsu

    2021 51st European Microwave Conference (EuMC)　725-728　2022/04

    Publisher: IEEE

    DOI： 10.23919/EuMC50147.2022.9784290 　

  6. RF Signal Frequency Identification in a Direct RF Undersampling Multi-Band Real-Time Spectrum Monitor for Wireless IoT Usage Peer-reviewed

    Tomoyuki FURUICHI, Mizuki MOTOYOSHI, Suguru KAMEDA, Takashi SHIBA, Noriharu SUEMATSU

    IEICE Transactions on Communications　E105.B　(4)　461-471　2022/04/01

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

    DOI： 10.1587/transcom.2021wwp0011 　

    ISSN： 0916-8516

    eISSN： 1745-1345

  7. A 5.5GHz-Band 2x2 Array Antennas Module Based on Compact 2-D Beamforming Network in Broadside Coupled Stripline Peer-reviewed

    J. Temga, M. Motoyoshi, T. Shiba, N. Suematsu

    2022 16th European Conference on Antennas and Propagation (EuCAP)　1-4　2022/03

    Publisher: IEEE

    DOI： 10.23919/EuCAP53622.2022.9769180 　

  8. 5 GHz-Band Simplified Beam Forming Wireless IoT Communication Using Wi-Fi Backscatter Peer-reviewed

    末松憲治, 枝松航輝, 枝松航輝, 枝松航輝, 町井大輝, 町井大輝, TEMGA Jean, 本良瑞樹, 本良瑞樹, 亀田卓, 亀田卓, 芝隆司

    電子情報通信学会論文誌 C(Web)　J105-C　(1)　2-10　2022

    DOI： 10.14923/transelej.2021MWI0001 　

    ISSN： 1881-0217

  9. A Simple Spectrum Reconstruction Method in Direct RF Undersampling Receiver for Real-Time Spectrum Monitor Peer-reviewed

    古市朋之, 古市朋之, 秋元浩平, 秋元浩平, 本良瑞樹, 本良瑞樹, 亀田卓, 亀田卓, 芝隆司, 末松憲治

    電子情報通信学会論文誌 C(Web)　J105-C　(4)　2022

    ISSN： 1881-0217

  10. A Spectrum Regeneration and Demodulation Method for Multiple Direct Undersampled Real Signals Peer-reviewed

    Takashi SHIBA, Tomoyuki FURUICHI, Mizuki MOTOYOSHI, Suguru KAMEDA, Noriharu SUEMATSU

    IEICE Transactions on Communications　E104.B　(10)　1260-1267　2021/10/01

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

    DOI： 10.1587/transcom.2020dsp0006 　

    ISSN： 0916-8516

    eISSN： 1745-1345

  11. A 5.5GHz Band 2-D Beamforming Network Using Broadside Coupled Stripline Structure Peer-reviewed

    J. Temga, M. Motoyoshi, T. Shiba, N. Suematsu

    2021 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)　1-3　2021/09

    Publisher: IEEE

    DOI： 10.1109/RFIT52905.2021.9565204 　

  12. A Filter Design Method of Direct RF Undersampling On-Board Receiver for Ka-Band HTS Peer-reviewed

    Tomoyuki FURUICHI, Yang GUI, Mizuki MOTOYOSHI, Suguru KAMEDA, Takashi SHIBA, Noriharu SUEMATSU

    IEICE Transactions on Communications　E103.B　(10)　1078-1085　2020/10/01

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

    DOI： 10.1587/transcom.2019cbp0008 　

    ISSN： 0916-8516

    eISSN： 1745-1345

  13. A Filter Design Method of Direct RF Undersampling On-Board Receiver for Ka-Band HTS Peer-reviewed

    FURUICHI Tomoyuki, GUI Yang, MOTOYOSHI Mizuki, KAMEDA Suguru, SHIBA Takashi, SUEMATSU Noriharu

    IEICE Transactions on Communications (Web)　E103.B　(10)　2020

    ISSN： 1745-1345

  14. 周期相関符号を用いた多重化位相符号変調法における自己・相互相関特性の改善法 Peer-reviewed

    芝隆司, 秋田学, 稲葉敬之

    電子情報通信学会論文誌 B(Web)　J102-B　(4)　2019

    ISSN： 1881-0209

  15. Study of Electrostatic Discharge Durability for Surface Acoustic Wave Module Peer-reviewed

    Takashi Shiba, Osamu Hikino, Daini Okajima, Naoko Kamogawa

    Japanese Journal of Applied Physics　44　(6S)　4523-4523　2005/06/01

    Publisher: IOP Publishing

    DOI： 10.1143/jjap.44.4523 　

    ISSN： 0021-4922

    eISSN： 1347-4065

    More details Close

    The electrostatic discharge (ESD) characteristics of surface acoustic wave (SAW) antenna duplexer modules are studied. We have researched the main spectrum of ESD at first. Using the result showing that the main ESD response has a 200 to 250 MHz spectrum, three new techniques for an improved circuit and one new technique for an improved SAW package are developed to achieve the desired ESD durability in this study. A high-pass filter (Q) circuit is proposed in order to suppress the 200 to 250 MHz spectrum. A large capacitance voltage control (Cv) circuit is proposed for suppressing the minus pulse ESD signal. A low impedance transmitter (Tx) port circuit (L) near 200 to 250 MHz is proposed for suppressing the plus pulse ESD signal. A high-pressure-sealing SAW package is proposed to improve SAW device ESD durability. The obtained circuits and methods are applied to an extended global system for mobile communication/digital cellular system/personal communication system (EGSM/DCS/PCS) triple-band SAW antenna duplexer modules. A sufficiently high ESD durability is obtained consequently.

  16. Characteristics of surface acoustic wave coupler using quadrature unidirectional transducer structure Peer-reviewed

    T Shiba, M Ide, Y Fujita

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　42　(5B)　3143-3147　2003/05

    DOI： 10.1143/JJAP.42.3143 　

    ISSN： 0021-4922

  17. Study of high isolation techniques for surface acoustic wave duplexer modules Peer-reviewed

    T Shiba, T Ishizaki, S Ikeda, N Kamogawa, N Hosaka, T Takagi, M Katagishi, M Hikita

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　42　(5B)　3148-3151　2003/05

    DOI： 10.1143/JJAP.42.3148 　

    ISSN： 0021-4922

  18. High isolation techniques for SAW duplexer modules Peer-reviewed

    T Shiba, N Kamogawa, T Ishizaki, D Okajima, N Hosaka, M Moteki, S Ogawa, K Oda, M Hikita

    2002 IEEE ULTRASONICS SYMPOSIUM PROCEEDINGS, VOLS 1 AND 2　105-108　2002

    ISSN： 1051-0117

  19. High isolation SAW antenna duplexer modules Peer-reviewed

    N Kamogawa, T Shiba, T Ishizaki, D Okajima, N Hosaka, M Moteki, S Ogawa, K Oda, MT Hikita

    2001 IEEE ULTRASONICS SYMPOSIUM PROCEEDINGS, VOLS 1 AND 2　309-314　2001

    ISSN： 1051-0117

  20. Initial Growth of Cu Films Fabricated by Sputtering and Evaporation. Peer-reviewed

    M. Tsunoda, M. Ashino, M. Takahashi, T. Shiba

    Journal of the Magnetics Society of Japan　23　(4-2)　1233-1236　1999

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/jmsjmag.23.1233 　

    ISSN： 0285-0192

  21. Percolation and continuation Thickness of Ag Films on the Initial Growth Stage Peer-reviewed

    TSUNODA M, ITO T, TAKAHASHI M, SHIBA T

    Journal of the Magnetics Society of Japan　22　(4)　453-456　1998/04/15

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/jmsjmag.22.453 　

    ISSN： 0285-0192

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    Growth of vapor-deposited Ag films by the coalescence process in the post-nucleation stage is discussed. During and after deposition, the amplitude <i>V</i> of surface acoustic waves (SAW) propagated on the piezoelectric substrate through the films deposited on it, and the electric sheet resistivity of the films, <i>R</i><sub>sq</sub>, were measured. The microstructures of films with various thicknesses <i>d</i> were examined with a scanning electron microscope. As a result, it was found that (1) the thickness <i>d</i><sub>p</sub> at which <i>V</i> reaches a minimum value corresponds to the critical thickness at which the islands of a film begin to percolate, (2) the thickness <i>d</i><sub>c</sub> at which 1/<i>R</i><sub>sq</sub> begins to be proportional to the film thickness corresponds to the critical thickness at which the film becomes two-dimensionally continuous, (3) <i>d</i><sub>p</sub> and <i>d</i><sub>c</sub> become larger with decreasing deposition rate, and (4) in the early coalescence stage (<i>d</i><<i>d</i><sub>p</sub>), the microstructural change progresses, increasing the average inter-island spacing. From these results, we can conclude that a higher deposition rate is necessary to suppress the microstructural change of islands and to allow fabrication of continuous ultra-thin films.

  22. Structural Changes in Ultra-Thin Ag Films Evaporated on a Cr Seed Layer Peer-reviewed

    TSUNODA M, ITO T, TAKAHASHI M, SHIBA T

    Journal of the Magnetics Society of Japan　22　(4)　457-460　1998/04/15

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/jmsjmag.22.457 　

    ISSN： 0285-0192

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    Structural change in vapor-deposited Ag films on a ultra-thin (< 10 Å) Cr seed layer during the coalescence process is discussed. During and after the deposition, the amplitude of surface acoustic waves (SAW) propagated on the piezoelectric substrate through the films deposited on it and the electric sheet resistivity of the films were measured. The microstructures of films with various thicknesses, <i>d</i> were examined with a scanning electron microscope. As a result, we found that (1) the critical thick-nesses <i>d</i><sub>p</sub> at which the islands of film begin to percolate and <i>d</i><sub>c</sub> at which the film becomes two-dimensionally continuous drastically decreased with increasing seed layer thickness, but (2) Ag films flattened by the Cr seed layer spontaneously tore when the deposition was interrupted at a thickness between <i>d</i><sub>p</sub> and <i>d</i><sub>c</sub>. We conclude that two-dimensionally continuous ultra-thin Ag films thinner than 120Å can be prepared on a 3-Å-thick Cr seed layer by continuous deposition.

  23. Automatic design procedure using circuit composition technique for SAW devices Peer-reviewed

    T Shiba, Y Fujita, N Kamogawa, N Hosaka, S Ogawa, K Oda, M Hikita

    1997 IEEE ULTRASONICS SYMPOSIUM PROCEEDINGS, VOLS 1 & 2　165-170　1997

  24. Low insertion loss surface acoustic wave matched filter with low sidelobe sequence and its application for spread spectrum communication Peer-reviewed

    T Shiba, A Yuhara, M Moteki, Y Ota, K Tamizu, D Okajima, K Oda, K Tsubouchi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　35　(5B)　3024-3027　1996/05

    ISSN： 0021-4922

  25. Influence of Metal Seed Layers on Initial Film Growth Peer-reviewed

    TSUNODA M, TAKAHASHI M, YAMADA N, WAKIYAMA T, SHIBA T

    Journal of the Magnetics Society of Japan　20　(2)　321-324　1996/04/01

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/jmsjmag.20.321 　

    ISSN： 0285-0192

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    Ag and Cu films were deposited by vacuum evaporation on a LiNbO<sub>3</sub> single-crystal substrate on which surface acoustic waves (SAW) at 45 MHz were propagating. Prior to the deposition, ultra-thin Ti, Cr, Cu, and Ag films were fabricated as seed layers. The coalescence processes in an earlier stage of the film growth were investigated by measuring the SAW amplitudes during deposition. The critical thickness, at which the film structure changes from islandlike to continuous, was found to decrease with increasing seed thickness, except in the case of Cu films deposited on Ag seed layers. Ag films deposited on ultra-thin seed layers had topologically smooth surfaces in comparison with films directly deposited on the substrate. These results suggest that islands of the seed layer capture the adatoms diffused over the substrate surface and become the growth centers for the subsequent film deposition.

  26. Study of triple transit echo for time sidelobe of SAW matched filter Peer-reviewed

    T Shiba, A Yuhara, K Oda, K Tsubouchi

    1996 IEEE ULTRASONICS SYMPOSIUM, PROCEEDINGS, VOLS 1 AND 2　187-192　1996

    ISSN： 1051-0117

  27. Low loss saw matched filters with low sidelobe sequences and spread spectrum applications Peer-reviewed

    T Shiba, A Yuhara, M Moteki, Y Ota, K Oda, K Tsubouchi

    IEEE ISSSTA '96 - IEEE FOURTH INTERNATIONAL SYMPOSIUM ON SPREAD SPECTRUM TECHNIQUES & APPLICATIONS, PROCEEDINGS, VOLS 1-3　740-745　1996

  28. Low loss saw matched filters with low sidelobe sequences for spread spectrum communications Peer-reviewed

    T Shiba, A Yuhara, M Moteki, Y Ota, K Oda, K Tsubouchi

    1995 IEEE ULTRASONICS SYMPOSIUM PROCEEDINGS, VOLS 1 AND 2　107-112　1995

    ISSN： 1051-0117

  29. Initial Growth of Metal Films Fabricated on a Substrate Excited by SAW. Peer-reviewed

    Tsunoda M, Yamada N, Takahashi M, Wakiyama T, Shiba T

    Journal of the Magnetics Society of Japan　19　(2)　317-320　1995

    Publisher: The Magnetics Society of Japan

    ISSN： 0285-0192

    More details Close

    Co and Fe ultra-thin films of various thicknesses coated with 50-Å-thick Cu film were prepared by vacuum evaporation on an LiNbO<sub>3</sub> single-crystal substrate excited by surface acoustic waves (SAW) at 45 MHz. In order to clarify the detailed correlation between the SAW attenuation and the microstructure of the metallic film in the initial growth stage, the magnetization curves and megnetoresistance of Cu-coated ultra-thin films were investigated as functions of Co or Fe thickness, <i>d</i>, in connection with the SAW propagation properties during deposition. With increasing <i>d</i>, the behavior of the magnetization curves changed from superparamagnetic to ferromagnetic, and the magnetoresistance, which is similar to that of Co-Cu granular alloy films, vanished at <i>d</i>=<i>d</i><sub>p</sub>, where the SAW attenuation reaches a maximum. From these results, it was concluded that the film thickness <i>d</i><sub>p</sub> corresponds to the critical thickness at which the film structure changes from island-like to continuous.

  30. Fabrication and Structure Controllability of Metal Films with a Substrate Excited by SAW. Peer-reviewed

    Tsunoda M, Takahashi M, Sakakibara S, Wakiyama T, Shiba T

    Journal of the Magnetics Society of Japan　18　(2)　289-294　1994

    Publisher: The Magnetics Society of Japan

    ISSN： 0285-0192

    More details Close

    Pure Ag, Cu, Ni, and Co films were prepared by vacuum evaporation on a LiNbO<sub>3</sub> single-crystal substrate excited by surface acoustic waves (SAW) at 45 MHz under various amplitude conditions. The surface morphology of the films and the SAW propagation properties during deposition were investigated in order to determine the influence of SAW excitation on the structural changes in the films. In the Ag and Cu films, the surface roughness <i>R</i><sub>a</sub> and the thickness <i>d</i><sub>p</sub> at which the SAW attenuation reached a maximum changed drastically as a function of the SAW amplitude, in contrast to the case for the Ni and Co films. Taking into account that <i>d</i><sub>p</sub> corresponds to the thickness at which the film structure changes from island to continuous, it was considered that SAW influences the initial stage of film growth and that a large SAW amplitude enhances the agglomeration of islands. By in situ monitoring of the propagation properties of SAW, microscopic structural changes were also found in the Ag and Cu films during the initial growth stage.

  31. INSERTION LOSS AND ACOUSTIC REFLECTION EXPRESSED BY SCATTERING MATRICES WITH ENERGY-DISSIPATION FOR SURFACE ACOUSTIC UNIDIRECTIONAL INTERDIGITAL-TRANSDUCERS Peer-reviewed

    T SHIBA, Y YAMADA, J YAMADA, K ODA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　32　(5B)　2329-2332　1993/05

    ISSN： 0021-4922

  32. Soft Magnetic Properties for Fe-B Films Sputtered in Ar+N2 Plasma Peer-reviewed

    T. Shiba, Y. Sakai, M. Takahashi, T. Wakiyama, K. Hiraga

    Journal of the Magnetics Society of Japan　15　(2)　351-356　1991/04

    DOI： 10.3379/jmsjmag.15.351 　

  33. Fabrication and Magnetic Properties of Thin Films Sputtered on the Substrate Excited by SAW Peer-reviewed

    M. Takahashi, A. Fujita, T. Shimatsu, T. Wakiyama, J. Yamada, T. Shiba

    IEEE Translation Journal on Magnetics in Japan　6　(2)　127-133　1991

    DOI： 10.1109/TJMJ.1991.4565122 　

    ISSN： 0882-4959

  34. DESIGN OF PHASE SHIFTERS FOR A GROUP TYPE UNIDIRECTIONAL TRANSDUCER Peer-reviewed

    H NOGAMI, T SHIBA, Y NORO, K ODA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　30　(1)　165-168　1991

    ISSN： 0021-4922

  35. New Thin Film Fabrication Technique using a Substrate Excited by Saw Peer-reviewed

    Migaku Takahashi, A. Fujita, T. Shimatsu, T. Wakiyama, J. Yamada, T. Shiba

    IEEE Transactions on Magnetics　26　(5)　1453-1455　1990

    DOI： 10.1109/20.104408 　

    ISSN： 1941-0069 0018-9464

  36. STUDY ON TRANSFORMER RATIO AND CAPACITANCE IN EQUIVALENT-CIRCUIT MODEL FOR SAW TRANSDUCER Peer-reviewed

    T SHIBA, J YAMADA, T TOYAMA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　29　(1)　129-132　1990

    ISSN： 0021-4922

  37. NEW TRANSDUCER CONSTRUCTION FOR WIDE-BAND SAW TV IF FILTERS Peer-reviewed

    T SHIBA, J YAMADA, T TOYAMA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　28　(2)　213-216　1989

    ISSN： 0021-4922

  38. A UNIDIRECTIONAL SAW TRANSDUCER WITH DIFFERENT FINGER PAIRS BETWEEN SENDING AND REFLECTING ELECTRODES Peer-reviewed

    J YAMADA, Y FUJITA, T SHIBA, T TOYAMA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　26　(2)　207-209　1987

    ISSN： 0021-4922

  39. A NEW UNIDIRECTIONAL SAW TRANSDUCER WITH A SIMPLIFIED EXTERNAL NETWORK

    Y FUJITA, T SHIBA, T TAKAHASHI, J YAMADA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　26　(1)　132-134　1987

    ISSN： 0021-4922

  40. SUPERCONDUCTING PROPERTIES AND PHASE-ANALYSIS OF NB-SI THIN-FILMS PRODUCED BY SPUTTERING Peer-reviewed

    S OHSHIMA, T SHIBA, T KAWANOBE, T WAKIYAMA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　25　(9)　1336-1341　1986/09

    ISSN： 0021-4922

  41. 400 MHZ SAW IF FILTER FOR SATELLITE BROADCAST RECEIVER WITHOUT ANY ADJUSTMENTS Peer-reviewed

    J YAMADA, A YUHARA, T SHIBA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　24　(3)　196-198　1985

    ISSN： 0021-4922

  42. EFFECT OF ELECTRODE RESISTANCE ON INSERTION LOSS AND TRIPLE TRANSIT ECHO IN SURFACE ACOUSTIC-WAVE FILTER Peer-reviewed

    T SHIBA, A YUHARA, J YAMADA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　23　(1)　145-147　1984

    ISSN： 0021-4922

Show all ︎Show first 5

Misc. 53

  1. 5 GHz-Band Simplified Beam Forming Wireless IoT Communication using Wi-Fi Backscatter

    古市朋之, 枝松航輝, TEMGA Jean, 本良瑞樹, 亀田卓, 芝隆司, 末松憲治

    電子情報通信学会技術研究報告(Web)　122　(243(SR2022 45-70))　2022

    ISSN： 2432-6380

  2. A Sampling Frequencies Design Algorithm for Frequency Determination in Direct RF Undersampling Multiband Reception

    古市朋之, 本良瑞樹, 亀田卓, 芝隆司, 末松憲治

    電子情報通信学会大会講演論文集(CD-ROM)　2021　2021

    ISSN： 1349-144X

  3. Fundamental Investigation of Multiple Access Method for 5-GHz Band Simplified Beam Forming Wireless IoT Communication Using Wi-Fi Backscatter

    亀田卓, 枝松航輝, 本良瑞樹, 芝隆司, 末松憲治

    電子情報通信学会技術研究報告(Web)　120　(405(SR2020 60-90))　2021

    ISSN： 2432-6380

  4. Wireless IoT Real Time Spectrum Monitor Based on Direct RF Undersampling Reception Technique

    末松憲治, 古市朋之, 古市朋之, 本良瑞樹, 亀田卓, 芝隆司

    電子情報通信学会技術研究報告(Web)　121　(30(SR2021 1-19))　2021

    ISSN： 2432-6380

  5. Foreign Object Debris Detection based on Stepped Multiple Frequency CPC

    稲葉 敬之, 秋田 学, 芝 隆司

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　119　(26)　35-40　2019/05/15

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  6. Same Range Target Detection with Large RCS Difference by Signal Descending Order Subtraction Target Detection Method for Multiple Frequency Random Stepped CPC Radar

    芝 隆司, 廣瀬 太亮, 太田 裕也, 秋田 学, 稲葉 敬之

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　117　(348)　233-238　2017/12/14

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  7. Same Range Target Detection with Large RCS Difference by Signal Descending Order Subtraction Target Detection Method for Multiple Frequency Random Stepped CPC Radar

    芝 隆司, 廣瀬 太亮, 太田 裕也, 秋田 学, 稲葉 敬之

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　117　(346)　233-238　2017/12/14

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  8. Same Range Target Detection with Large RCS Difference by Signal Descending Order Subtraction Target Detection Method for Multiple Frequency Random Stepped CPC Radar

    芝 隆司, 廣瀬 太亮, 太田 裕也, 秋田 学, 稲葉 敬之

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　117　(347)　233-238　2017/12/14

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  9. Effect of Front-end Characteristics on Sidelobe of Pulse MIMO Radar Using Complex Sequence with Low Sidelobe Aperiodic Correlation

    芝 隆司, 渡辺 優人, 秋田 学, 稲葉 敬之

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　117　(243)　161-166　2017/10/19

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  10. Effect of Front-end Characteristics on Sidelobe of Pulse MIMO Radar Using Complex Sequence with Low Sidelobe Aperiodic Correlation

    芝 隆司, 渡辺 優人, 秋田 学, 稲葉 敬之

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　117　(244)　161-166　2017/10/19

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  11. Effect of Front-end Characteristics on Sidelobe of Pulse MIMO Radar Using Complex Sequence with Low Sidelobe Aperiodic Correlation

    芝 隆司, 渡辺 優人, 秋田 学, 稲葉 敬之

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　117　(245)　161-166　2017/10/19

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  12. Effect of Front-end Characteristics on Sidelobe of Pulse MIMO Radar Using Complex Sequence with Low Sidelobe Aperiodic Correlation

    芝 隆司, 渡辺 優人, 秋田 学, 稲葉 敬之

    電気学会研究会資料. EMC = The papers of technical meeting on electromagnetic compatibility, IEE Japan　2017　(31)　161-166　2017/10/19

    Publisher: 電気学会

  13. Mapping Profile of Stepped Multiple Frequency CPC Radar on Obstacle Avoidance

    芝 隆司, 安藤 嘉章, 太田 敏行, 坂本 禎治郎, 渡辺 優人, 秋田 学, 稲葉 敬之

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　116　(427)　1-6　2017/01/26

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  14. Development of PCHPRF Radar Experimental Equipment

    芝 隆司, 渡辺 優人, 石井 雅博, 秋田 学, 稲葉 敬之

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　116　(427)　99-104　2017/01/26

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  15. Multiplexing of Antenna Signal Using Perfect Periodic Code for PC-HPRF Radar

    芝 隆司, 渡辺 優人, 石井 雅博

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　115　(403)　53-58　2016/01/21

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  16. Development of RF Simulation for PC-HPRF Radar

    芝 隆司, 渡辺 優人, 石井 雅博

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　115　(372)　7-12　2015/12/17

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  17. Complex Sequence with Low Sidelobe Aperiodic Correlation for Code Division Multiple PC-HPRF Radar

    芝 隆司, 渡辺 優人, 石井 雅博

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　115　(282)　37-42　2015/10/30

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  18. Development of Tunable Duplexer with Variable Frequency Resonators

    IKEDA Kazuki, TONE Masazumi, TEMMEIN Hiroyuki, ISOBE Atsushi, YAMAMOTO Akio, MATSUSHIMA Naoki, SHIBA Takashi, HIKINO Osamu, ISHIZAKI Tatsuhiko

    IEICE technical report. Microwaves　113　(204)　11-16　2013/09/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

    More details Close

    We proposed a tunable duplexer consisted of variable frequency resonator with a troidal air core inductor and a variable capacitor to develop the tunable duplexer which can be used for the cellular system. As results of circuit simulation with equivalent circuits and electromagnetic analysis of variable frequency resonators, the tunable duplexer has 700MHz〜2700MHz of wideband tunable range, less than 4.2dB of pass-band loss, and over 46dB of stop-band attenuation. As measurement results, we confirmed that the troidal air core inductor which constructs the tunable duplexer is achieved requirements of its inductance and Q-value. Therefore, we have obtained a vision to develop the tunable duplexer.

  19. B-17-3 Broad band duplexer for wireless communication : Canceller circuit for tunable duplexer

    Tone Masazumi, Akiyama Hitoshi, Hikino Osamu, Shiba Takashi, Kamogawa Naoko

    Proceedings of the IEICE General Conference　2011　(1)　599-599　2011/02/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  20. Observation and Supression of Spurious Wave for DMS SAW Filter

    SHIBA Takashi, OSAWA Shinichiro, HAMASAKI Junichi, FUJITA Yuji, CHIBA Takao

    IEICE technical report. Ultrasonics　104　(213)　7-10　2004/07/15

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    The double mode IDTs structure on 42deg.Y-X LiTaO3 is selected as our experiment for low loss EGSM filter. We have observed Leaky-SAW radiation pattern at first. SAW radiation patterns are obtained using a heterodyne interferometer-type laser probe method. Two spurious radiation modes are observed in the conventional double-mode structure. First mode wave is traveling toward the almost same direction of the main SAW response on bus-bar edge. Second mode wave is traveling toward the direction 40deg. angle rotated from the main SAW direction. We success to suppress the first sourious mode by using grating structure which reduces the SAW velocity on edge of bus-bar. The first sourious mode wave is not observed and low loss frequency characteristics are measured in new IDT structure. The aperture of grating structure is optimized by testing the various parameters of the structure. Consequently, loss of the filter is improved by the new wave-guide structure.

  21. P2-18 Study of ESD Durability for SAW module(Short presentation for poster)

    Shiba Takashi, Hikino Osamu, Okajima Daini, Kamogawa Naoko

    Proceedings of Symposium on Ultrasonic Electronics　25　(0)　193-194　2004

    Publisher: Institute for Ultrasonic Elecronics

    ISSN： 1348-8236

  22. P3-38 Study of High Isolation Techniques for SAW Duplexer Modules

    SHIBA Takashi, ISHIZAKI Tatsuhiko, IKEDA Soichiro, HOSAKA Norio, TAKAGI Taku, KATAGISHI Makoto, HIKITA Mitsutaka

    Proceedings of Symposium on Ultrasonic Electronics　23　(0)　345-346　2002

    Publisher: 超音波エレクトロニクスの基礎と応用に関するシンポジウム運営委員会

  23. P3-37 Effect of Electrode Resistance for Characteristics of Filter with Surface Acoustic Wave Coupler Using Quadrature UDT Structure

    SHIBA Takashi, IDE Mayumi, FUJITA Yuji

    Proceedings of Symposium on Ultrasonic Electronics　23　(0)　343-344　2002

    Publisher: 超音波エレクトロニクスの基礎と応用に関するシンポジウム運営委員会

  24. High Isolation SAW Antenna Duplexer Modules

    KAMOGAWA Naoko, SHIBA Takashi, ISHIZAKI Tatsuhiko, OKAJIMA Daini, HOSAKA Norio, MOTEKI Minoru, OGAWA Seiichi, ODA Koji, HIKITA Mitsutaka

    IEICE technical report. Ultrasonics　101　(316)　19-26　2001/09/18

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    An optimized phase shifter condition for the SAW antenna modules has been provided to achieve high isolation performances when the load impedance is not characteristics impedance. In the EGSM/DCS dual band antenna duplexer modules, impedances of low noise amplifiers connecting the Rx ports are not characteristics impedance when the amplifier switches are off state at transmitter period. We propose optimized phase shifter circuits for EGSM Rx output ports. Isolation improvement of 6 dB is obtained in this case. In the Japanese cdmaOne duplexer, we propose an optimized phase shifter circuit for the transmitter circuit between Rx band trap and transmitter top filter block. Isolation improvement of 1 to 3 dB is obtained in this case.

  25. Wideband SAW Filters Using Cascaded Unidirectional Transducers

    SHIBA Takashi, FUJITA Yuji, KONDO Seima, HAMASAKI Junchi, IDE Mayumi, OGAWA Seiichi, ODA Koji

    IEICE technical report. Ultrasonics　101　(316)　27-34　2001/09/18

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    SAW devices has been proposed which compose a group type unidirectional technique and cascaded interdigital transducers (IDTs) structure to achieve desired performances without the gratings and the external phase shifters. In order to confirm the prediction, simulations and experiments are applied. We select the equivalent circuit model and circuit composition procedure as a simulation technique. The predictions are verified by the simulations and the experiments. And an improved cascaded UDT structure has also been proposed to achieve desired wideband performances.

  26. 携帯電話用高機能SAWモジュール (特集 21世紀を切り開くディジタル映像コミュニケーション)

    芝 隆司, 小川 誠一, 柴垣 信彦

    日立評論　82　(11)　45-48　2000/11

    Publisher: 日立評論社

    ISSN： 0367-5874

  27. Initial Growth of Cu Films fabricated by sputtering and evaporation

    TSUNODA M, ASHINO M, TAKAHASHI M, SHIBA T

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan　22　419-419　1998/09/01

  28. Percolation and continuation thickness of Ag films on initial growth stage

    TSUNODA M, ITO T, TAKAHASHI M, SHIBA T

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan　21　322-322　1997/10/01

  29. Structural change in initial growth stage of Ag films evaporated on Cr seed layer

    TSUNODA M, ITO T, TAKAHASHI M, SHIBA T

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan　21　323-323　1997/10/01

  30. SAW Matched Filters for Asynchronous chip/carrier S-S Wireless Systems

    HOSAKA Norio, SHIBA Takashi, OGAWA Seiichi, MOTEKI Minoru, ODA Kouji, HAMAZUMI Hiroyuki, SHIBUYA Kazuhiko

    IEICE technical report. Ultrasonics　97　(148)　19-24　1997/07/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

    More details Close

    We developed SAW matched filters for an asynchronous chip/carrier spread spectrum systems. Under the condition of the carrier signal phase and PN code, 256 tapped delay lines for the filters are designed. Correlation characteristics of the SAW matched filters are verified by the simulation. We applied the filters to 375MHz S-S demodulation circuits for broadcasting systems.18dB peak vs.sidelobe of correlated output signal is obtained.

  31. SAW Matched Filters for Asynchronous chip/carrier S-S Wireless Systems

    HOSAKA Norio, SHIBA Takashi, OGAWA Seiichi, MOTEKI Minoru, ODA Kouji, HAMAZUMI Hiroyuki, SHIBUYA Kazuhiko

    IEICE technical report. Component parts and materials　97　(150)　19-24　1997/07/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

    More details Close

    We developed SAW matched filters for an asynchronous chip/carrier spread spectrum systems. Under the condition of the carrier signal phase and PN code, 256 tapped delay lines for the filters are designed. Correlation characteristics of the SAW matched filters are verified by the simulation. We applied the filters to 375MHz S-S demodulation circuits for broadcasting systems.18dB peak vs.sidelobe of correlated output signal is obtained.

  32. SAW Matched Filters for Asynchronous chip/carrier S-S Wireless Systems

    HOSAKA Norio, SHIBA Takashi, OGAWA Seiichi, MOTEKI Minoru, ODA Kouji, HAMAZUMI Hiroyuki, SHIBUYA Kazuhiko

    IEICE technical report. EMD　97　(149)　19-24　1997/07/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

    More details Close

    We developed SAW matched filters for an asynchronous chip/carrier spread spectrum systems. Under the condition of the carrier signal phase and PN code, 256 tapped delay lines for the filters are designed. Correlation characteristics of the SAW matched filters are verified by the simulation. We applied the filters to 375MHz S-S demodulation circuits for broadcasting systems.18dB peak vs.sidelobe of correlated output signal is obtained.

  33. SAW Matched Filters for Asynchronous chip/carrier S-S Wireless Systems

    HOSAKA Norio, SHIBA Takashi, OGAWA Seiichi, MOTEKI Minoru, ODA Kouji, HAMAZUMI Hiroyuki, SHIBUYA Kazuhiko

    Technical report of IEICE. OME　97　(151)　19-24　1997/07/04

    Publisher: The Institute of Electronics, Information and Communication Engineers

    More details Close

    We developed SAW matched filters for an asynchronous chip/carrier spread spectrum systems. Under the condition of the carrier signal phase and PN code, 256 tapped delay lines for the filters are designed. Correlation characteristics of the SAW matched filters are verified by the simulation. We applied the filters to 375MHz S-S demodulation circuits for broadcasting systems.18dB peak vs.sidelobe of correlated output signal is obtained.

  34. Micro Fabrication Technology For GHz SAW Devices

    Yuhara Akitsuna, Hosaka Norio, Ohta Yasuhiro, Shiba Takashi, Yamada Jun, Oda Kohji

    Proceedings of the IEICE General Conference　1997　510-511　1997/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

    More details Close

    移動通信等の新しい通信システム・情報メディアの導入と展開が進行し、マルチメディアが唱えられるに伴い、小型化に適し、位相特性に特長の出せる弾性表面波(SAW)デバイスは応用範囲をますます高周波に拡げ、既にGHz帯の実用化例もいくつか有る。そこでは微細電極の形成が、先ず頭に浮かぶ程であるが、SAW固有の事項と周辺に触れつつ、微細加工技術について述べる。

  35. Effect of Triple Transit Echo for Correlation Signal of SAW Matched Filter

    SHIBA Takashi, YUHARA Akitsuna, ODA Kouji, MOTEKI Minoru, TSUBOUCHI Kazuo

    IEICE technical report. Ultrasonics　96　(179)　53-60　1996/07/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

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    SAW matched filter is a key-device for Spread Spectrum (SS) communication. We have shown that the TTE level of matched filter the for SS signal for is lower than that of an ordinary SAW tnansversal filter for CW signals even if outer circuit-impedance is fully matched to the SAW matched filter. A time-domain analysis using an cincuit network tool for various kind of construction have been used for the matched filter with 25-chip low autocorrelation sequence, this analysis agreed with the experiments to verify this TTE behavor.

  36. A Spread-Spectrum Radio Unit Using A low Time-Sidelobe SAW Matched Filter and Its application to Moving-Picture Wireless-Transmission

    YUHARA Akitsuna, SHIBA Takashi, KURASHIGE Tomoyuki, MOTEKI Minoru, TAMIZU Kazuhide, OKAJIMA Daini, OHTA Yasuhiro, IMAIDE Takuya

    Proceedings of The ITE Annual Convention　32　(0)　263-264　1996

    Publisher: The Institute of Image Information and Television Engineers

    DOI： 10.11485/tvac.32.0_263 　

    ISSN： 0919-1879

    More details Close

    A 1Mbps spread spectrum (SS) radio unit has been developed for wireless communication. As a first step, the very weak intensity 300MHz carrier signals are transmitted with direct sequence (DS) spectrum-spreading. The received signals are despread by using a SAW matched filter with a locally deposited ZnO layer on the input IDT on a st-cut quartz substrate to reduce mismatch loss. For DPSK data time-sidelobe of the filter autocorrelation is reduced using a new 25 chip spreading code. Further a time-window threshold-gate is developed, enhancing the receiver sensitivity by 8dB. As a tryal application to moving-picture wireless-transmission, a prototype visual transceiver has been developed, receiving the moving pictures of 112 × 112pixels with 5 frames/s at a distance 10 to 20m from the transmitter.

  37. A Spread Spectrum Radio Unit for The Very Weak lntensity Carrier-Signal Wireless Communication

    MOTEKI Minoru, TAMIZU Kazuhide, OKAJIMA Daini, SHIBA Takashi, YUHARA Akitsuna, TSUBOUCHI Kazuo

    Technical report of IEICE. SST　95　(302)　43-48　1995/10/19

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    A lMbps spread spectrum(SS) radio unit has been developed for wireless communication with the very weak intensity carrier signals in Japan. In this unit 300MHz carrier signals are transmitted with direct-sequence (DS) spectrum-spreading, and the received signals are despread by using a SAW matched filter, after that differentially coherent detection of the despread signals is achieved to decide data bits. Loss of the SAW matched filter is reduced using a locally deposited ZnO layer on the input IDT on a st-cut quartz substrate by 9dB. For DPSK data time-sidelobe of the filter autocorrelation is reduced using a new 25 chip spreading code by 6dB compared with a 31 chip M-sequence. Further a time-window threshold-gate is developed, enhancing the receiver sensitivity by 8 dB. As a result of these improvements this radio unit can receive the radio signals at a distance 10 to 20 m from the transmitter.

  38. Initial growth of Ag films(Observation by using the substrate excited by SAW)

    TSUNODA M, ITO T, TAKAHASHI M, WAKIYAMA T, SHIBA T

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan　19　512-512　1995/09/01

  39. Evaluation of Seed layer effect for initial film growth(Evaluated by surface acoustic waves)

    TSUNODA M, TAKAHASHI Migaku, WAKIYAMA T, SHIBA T

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan　19　515-515　1995/09/01

  40. SAW Source Intensity Distribution Using 3D FEM Analysis and Their Application for Diffraction Simulation for SAW Filters

    HIKINO Osamu, KOSHIBA Masanori, HASEGAWA Koji, SHIBA Takashi, YUHARA Akitsuna

    IEICE technical report. Ultrasonics　95　(150)　55-62　1995/07/20

    Publisher: The Institute of Electronics, Information and Communication Engineers

    More details Close

    A SAW-Diffraction simulation method is discussed for more accurate designing of SAW filters. In this method, instead of conventional sources such as homogeneous line source or charge density distribution, a line source having intensity distribution derived from a particle-displacement-distribution analysis using a three-dimensional FEM (finite element method) is utilized as source of angular spectrum of wave (ASW) method. Further, considering distributed transduction from acoustic field to electrical signals in output electrodes, frequency characteristics of SAW filters are calculated. By using this method, more accurate simulation results of out-band rejection is obtained when the center distance between input and output transducers is smaller than 80 wavelength.

  41. Study of LowLoss SAW Matched Filters with Low Sidelobe Sequences

    SHIBA Takashi, YUHARA Akitsuna, OTA Yasuhiro, YAMADA Yoshihiro, MOTEKI Minoru, ODA Kouji, TSUBOUCHI Kazuo

    IEICE technical report. Ultrasonics　95　(132)　35-42　1995/06/27

    Publisher: The Institute of Electronics, Information and Communication Engineers

    More details Close

    For direct sequence (DS) spread spectrum (s-s) communication systems with DPSK modulation, we have searched out new pseudo noise (PN) sequences. Furthermore, a new construction of a low loss SAW matched filter is developed, comprising localized ZnO-layered structure on a quartz crystal. As a result of the sequences and the construction, 14dB (6dB improvement on the conventional m-sequences) peak vs. sidelobe of correlated output-signal and 9dB lower loss than that of conventional one without ZnO film was achieved for a 300MHz SAW matched filter corresponding to the above PN-sequences with 25chips. We have applied these matched filters to SS rf-modem-units for weak power digital communications. In these modem-units the high data-rate (1Mbps), long communication distance (about 20m) and low current (210mA when received) performances are obtained.

  42. PC8 Proposition of Low Loss SAW Matched Filters with Low Sidelobe Sequences

    SHIBA Takashi, YUHARA Akitsuna, OTA Yasuhiro, MOTEKI Minoru, Tamizu Kazuhide, Okajima Daini, ODA Kouji, TSUBOUCHI Kazuo

    Proceedings of Symposium on Ultrasonic Electronics　16　(0)　147-148　1995

    Publisher: 超音波エレクトロニクスの基礎と応用に関するシンポジウム運営委員会

  43. Direct Sequence S-S Radio Unit for Moving-Picture Wireless-Transmission

    SHIBA Takashi, YUHARA Akitsuna, KURASHIGE Tomoyuki, MOTEKI Minoru, TAMIZU Kazuhide, OKAJIMA Daini, OHTA Yasuhiro, IMAIDE Takuya

    Proceedings of The ITE Winter Annual Convention　1995　(0)　85-85　1995

    Publisher: The Institute of Image Information and Television Engineers

    DOI： 10.11485/tvwac.1995.0_85 　

    ISSN： 1342-0402

  44. K3 Insertion Loss and Acoustic Reflection for Surface Acoustic Wave Unidirectional-Interdigital Transducers Considering Energy-Dissipation

    Shiba Takashi, Yamada Yoshihiro, Yamada Jun, Oda Kouji

    Proceedings of Symposium on Ultrasonic Electronics　13　(0)　269-270　1992

    Publisher: 超音波エレクトロニクスの基礎と応用に関するシンポジウム運営委員会

  45. G5 Study on impulse-deviation of non-periodic structured interdigital surface wave transducers

    Ikeda H, Shiba T, Hikino O, Yuhara A

    Proceedings of Symposium on Ultrasonic Electronics　12　(0)　219-220　1991

    Publisher: Steering committee of symposium on ultrasonic electronics

  46. Fabrication and magnetic properties of fe thin films on the substrate excited by SAW.

    Takahashi Migaku, Tanaka T, Shimatsu T, Uemura M, Wakiyama T, Yamada J, Shiba T

    Journal of the Magnetics Society of Japan　15　(2)　323-326　1991

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/jmsjmag.14.323 　

    ISSN： 0285-0192

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    Fe films of 300Å thickness were prepared by electron beam evaporation and d. c. magnetron sputtering onto LiNbO<sub>3</sub> single crystal substrate excited by surface acoustic wave (SAW) at 45 MHz. Biaxial anisotropy was induced in plane for evaporated films excited at 8 V, while not induced for all sputtered films. The saturation magnetization, <i>M</i><sub>s</sub>, of evaporated films increased with increases in the excitation voltage, and reached the bulk value at excitation voltage of 8 V. However, <i>M</i><sub>s</sub> of sputtered films did not change by SAW excitation. The density of evaporated films was close to the density of bulk Fe at excitation voltage of 8 V. This fact shows that the structure of evaporated films changed from a porous structure to a dense structure by SAW excitation. Furthermore, the surface became smooth in the excited films.

  47. 1PD-4 Design of Phase Shifters in a Unidirectional IDT

    NOGAMI H, SHIBA T, NORO Y, ODA K

    Proceedings of Symposium on Ultrasonic Electronics　11　(0)　60-61　1990

    Publisher: Steering committee of symposium on ultrasonic electronics

  48. Fabrication and magnetic properties of thin films sputtered on the substrate excited by SAW.

    Takahashi M, Fujita A, Shimatsu T, Wakiyama T, Yamada J, Shiba T

    Journal of the Magnetics Society of Japan　14　(2)　323-326　1990

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/jmsjmag.14.323 　

    ISSN： 0285-0192

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    Permalloy films of 300Å thickness were prepared by d.c. magnetron sputtering onto LiNbO<sub>3</sub> single crystal substrate excited by SAW at 45 MHz. Film structure such as shapes and size of grains was found to be drastically changed as a function of excited amplitude. Especially in the case of 24Å<sub>o-p</sub> for excited amplitude, films consisted of very fine homogeneous grains and showed magnetic softness, namely minimum coercive force. Uniaxial anisotropy was induced in plane for all the films examined; however, in the critical excited amplitude mentioned above, a drastic change of the easy axis in plane was found. As a conclusion, film preparation onto the substrate excited by SAW is considered to be a highly useful method to control the microscopical film structure and also the magnetic properties.

  49. 3-F-4 A Study for Transformer Ratio and Capacitance in a SAW Equivalent Circuit Model

    芝 隆司, 山田 純, 外山 立郎

    Proceedings of Symposium on Ultrasonic Electronics　10　(0)　183-184　1989

    Publisher: Steering committee of symposium on ultrasonic electronics

  50. 2)高周波弾性表面波デバイスの設計と民生電子機器への応用(テレビジョン電子装置研究会(第143回))

    山田 純, 湯原 章綱, 芝 隆司, 外山 五郎

    テレビジョン学会誌　40　(8)　814-814　1986/08/20

    Publisher: 一般社団法人映像情報メディア学会

    ISSN： 0386-6831

  51. B-6 A Newly Simplified External Network for Unidirectional SAW Transducers

    Fujita Yuji, Shiba Takashi, Takahashi Toshimitsu, Yamada Jun

    Proceedings of Symposium on Ultrasonic Electronics　7　(0)　75-76　1986

    Publisher: 超音波エレクトロニクスの基礎と応用に関するシンポジウム運営委員会

  52. Design Techniques of High Frequency SAW Devices and Their Applications in Consumer Electronics

    YAMADA Jun, YUHARA Akitsuna, SHIBA Takashi, TOYAMA Tatsuro

    ITE Technical Report　10　(4)　59-64　1986

    Publisher: The Institute of Image Information and Television Engineers

    DOI： 10.11485/tvtr.10.4_59 　

    ISSN： 0386-4227

  53. P-25 Effect of Finger Resistance on Loss and Triple Transit Echo

    Shiba T, Yuhara A, Yamada J

    Proceedings of Symposium on Ultrasonic Electronics　4　(0)　99-100　1983

    Publisher: Steering committee of symposium on ultrasonic electronics

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Industrial Property Rights 153

  1. チューナブルダイプレクサ、及びチューナブルダイプレクサを用いた移動通信端末

    比企野 治, 芝 隆司, 山本 昭夫, 利根 正純, 池田 一樹

    Property Type: Patent

  2. 帯域可変フィルタ

    天明 浩之, 山崎 哲也, 利根 正純, 池田 一樹, 礒部 敦, 芝 隆司, 比企野 治

    Property Type: Patent

  3. 共振器、デュプレクサ、及び通信装置

    池田 一樹, 山本 昭夫, 利根 正純, 芝 隆司, 比企野 治

    Property Type: Patent

  4. 移動通信端末用送受信モジュール、及び移動通信端末

    利根 正純, 池田 一樹, 山本 昭夫, 芝 隆司, 比企野 治

    Property Type: Patent

  5. 帯域可変フィルタ

    天明 浩之, 利根 正純, 池田 一樹, 山▲崎▼ 哲也, 礒部 敦, 芝 隆司, 比企野 治

    Property Type: Patent

  6. 共振器、デュプレクサ、および、通信装置

    池田 一樹, 山本 昭夫, 芝 隆司, 比企野 治, 利根 正純

    Property Type: Patent

  7. 移動通信端末用送受信モジュール、及び移動通信端末

    利根 正純, 山本 昭夫, 芝 隆司, 比企野 治, 池田 一樹

    Property Type: Patent

  8. 無線通信端末向けのモジュール及び無線通信方法

    山本 昭夫, 利根 正純, 芝 隆司, 比企野 治

    Property Type: Patent

  9. 移動通信端末用モジュール、及び移動通信端末

    利根 正純, 山本 昭夫, 芝 隆司, 比企野 治

    Property Type: Patent

  10. ワンチップ漏洩表面弾性波装置

    礒部 敦, 浅井 健吾, 芝 隆司, 比企野 治, 近藤 清磨, 及川 裕一, 遠藤 友裕

    Property Type: Patent

  11. 弾性表面波装置

    芝 隆司, 近藤 清磨, 及川 裕一, 遠藤 友裕, 長島 史朗

    Property Type: Patent

  12. 移動通信端末用モジュール

    山本 昭夫, 利根 正純, 芝 隆司, 比企野 治

    Property Type: Patent

  13. 移動通信端末向けのモジュール

    山本 昭夫, 利根 正純, 芝 隆司, 比企野 治

    Property Type: Patent

  14. 移動通信端末用モジュール、及び移動通信端末

    利根 正純, 山本 昭夫, 芝 隆司, 比企野 治

    Property Type: Patent

  15. チューナブルフィルタ、チューナブルデュプレクサ、及び、それらを用いた移動通信端末

    比企野 治, 芝 隆司, 鴨川 直子, 山本 昭夫, 利根 正純

    Property Type: Patent

  16. 移動通信端末用モジュール、及び移動通信端末

    利根 正純, 山本 昭夫, 芝 隆司, 比企野 治

    Property Type: Patent

  17. 移動通信端末向けのモジュール及びそれを用いた移動通信端末

    山本 昭夫, 秋山 仁, 芝 隆司, 比企野 治

    Property Type: Patent

  18. 移動通信端末向けのモジュール及びそれを用いた移動通信端末

    山本 昭夫, 秋山 仁, 芝 隆司, 比企野 治

    特許第5325752号

    Property Type: Patent

  19. 高周波回路装置及びこれを搭載した通信装置。

    戸塚 貴雄, 芝 隆司, 比企野 治

    Property Type: Patent

  20. 高周波回路装置及びこれを搭載した通信装置。

    戸塚 貴雄, 芝 隆司, 比企野 治

    特許第4637026号

    Property Type: Patent

  21. 圧電薄膜弾性波素子及びこれを用いた情報処理装置

    芝 隆司, 坪内 和夫, 上原 健誠, 中瀬 博之, 亀田 卓, 礒田 陽次, 長 康雄

    Property Type: Patent

  22. 圧電薄膜弾性波素子、圧電薄膜弾性波素子を用いた情報処理装置、及び圧電薄膜弾性波素子の製造方法

    芝 隆司, 坪内 和夫, 上原 健誠, 中瀬 博之, 亀田 卓, 礒田 陽次, 長 康雄

    特許第5097338号

    Property Type: Patent

  23. 信号回路及びこれを備える情報処理装置

    木島 正人, 比企野 治, 芝 隆司

    Property Type: Patent

  24. 弾性表面波フィルタ装置及びそれを備えた通信装置

    村上 哲, 芝 隆司, 藤田 勇次, 浜崎 淳一, 大澤 眞一郎

    Property Type: Patent

  25. 弾性表面波装置及びそれを用いた通信装置

    浜崎 淳一, 芝 隆司, 藤田 勇次, 大澤 眞一郎, 千葉 孝雄

    Property Type: Patent

  26. 弾性表面波フィルタ素子、弾性表面波共振器、弾性表面波フィルタおよびその弾性表面波フィルタ用いた通信用フィルタ

    大澤 眞一郎, 芝 隆司, 藤田 勇次, 浜崎 淳一, 村上 哲

    Property Type: Patent

  27. 弾性表面波フィルタ素子、弾性表面波共振器、弾性表面波フィルタ、通信用フィルタ及び携帯電話機

    大澤 眞一郎, 芝 隆司, 藤田 勇次, 浜崎 淳一, 村上 哲

    特許第4504717号

    Property Type: Patent

  28. 弾性表面波フィルタ

    浜崎 淳一, 芝 隆司, 藤田 勇次, 大澤 眞一郎, 村上 哲

    Property Type: Patent

  29. マルチバンド用送受信機およびそれを用いた無線通信機

    和田 俊之, 深町 啓介, 林 健児, 芝 隆司, 保坂 憲生, 片岸 誠

    Property Type: Patent

  30. マルチバンド用送受信機およびそれを用いた無線通信機

    和田 俊之, 深町 啓介, 林 健児, 芝 隆司, 保坂 憲生, 片岸 誠

    特許第4010504号

    Property Type: Patent

  31. 弾性表面波装置および通信装置

    芝 隆司, 渡辺 一志, 保坂 憲生, 山田 佳弘, 比企野 治, 池田 宏明

    Property Type: Patent

  32. 弾性表面波装置および通信装置

    芝 隆司, 渡辺 一志, 保坂 憲生, 山田 佳弘, 比企野 治, 池田 宏明

    特許第3733957号

    Property Type: Patent

  33. 無線情報通信システムならびにそれに用いる端末装置

    畑下 博, 藤田 勇次, 芝 隆司

    Property Type: Patent

  34. 弾性表面波装置及びそれを用いた通信装置

    芝 隆司, 藤田 勇次, 射手 真弓, 近藤 清磨

    Property Type: Patent

  35. 弾性表面波装置及びそれを用いた通信装置

    芝 隆司, 藤田 勇次, 射手 真弓, 近藤 清磨

    特許第4363807号

    Property Type: Patent

  36. 帯域可変型フィルタ装置及びそれを用いた通信装置

    田丸 謙二, 芝 隆司, 小栗 雅夫

    Property Type: Patent

  37. 弾性表面波装置及びそれを用いた通信装置

    芝 隆司, 藤田 勇次, 近藤 清磨, 浜崎 淳一

    Property Type: Patent

  38. 弾性表面波装置及びそれを用いた通信装置

    芝 隆司, 藤田 勇次, 近藤 清磨, 浜崎 淳一

    特許第4414583号

    Property Type: Patent

  39. 弾性表面波装置および通信方式および通信装置

    芝 隆司, 渡辺 一志, 保坂 憲生, 山田 佳弘, 比企野 治, 池田 宏明

    Property Type: Patent

  40. 弾性表面波装置および通信装置

    芝 隆司, 渡辺 一志, 保坂 憲生, 山田 佳弘, 比企野 治, 池田 宏明

    特許第3446752号

    Property Type: Patent

  41. 弾性表面波装置およびそれに接続された回路およびその測定方法および通信装置

    山田 佳弘, 芝 隆司, 伊藤 克美

    特許第4038348号

    Property Type: Patent

  42. 弾性表面波装置およびそれに接続された回路およびその測定方法および通信装置

    山田 佳弘, 芝 隆司, 伊藤 克美

    Property Type: Patent

  43. 表面実装型弾性表面波装置

    射手 真弓, 近藤 清磨, 藤田 勇次, 芝 隆司

    Property Type: Patent

  44. 弾性表面波装置

    保坂 憲生, 芝 隆司

    Property Type: Patent

  45. マッチドフィルタ及び通信システム

    芝 隆司, 比企野 治, 保坂 憲生, 藤田 勇次

    Property Type: Patent

  46. マッチドフィルタ及び通信システム

    芝 隆司, 比企野 治, 保坂 憲生, 藤田 勇次

    特許第4363707号

    Property Type: Patent

  47. 表面実装型弾性表面波フィルタ

    菊地 一成, 若森 聡, 近藤 清磨, 小川 誠一, 芝 隆司

    Property Type: Patent

  48. 高周波モジュール

    百海 繁雄, 鴨川 直子, 芝 隆司, 小川 誠一

    Property Type: Patent

  49. 弾性表面波フィルタ

    近藤 清磨, 藤田 勇次, 芝 隆司

    Property Type: Patent

  50. 弾性表面波装置及びそれを用いた通信システム

    芝 隆司, 藤田 勇次, 保坂 憲生, 近藤 清磨

    Property Type: Patent

  51. 弾性表面波装置及びそれを用いた通信システム

    芝 隆司, 藤田 勇次, 保坂 憲生, 近藤 清磨

    特許第3996997号

    Property Type: Patent

  52. 移動端末装置

    須藤 茂幸, 比企野 治, 芝 隆司

    Property Type: Patent

  53. 移動端末装置

    須藤 茂幸, 比企野 治, 芝 隆司

    特許第3848768号

    Property Type: Patent

  54. 通信システム

    茂木 稔, 田水 一秀, 岡島 大仁, 田丸 謙二, 木島 正人, 芝 隆司

    Property Type: Patent

  55. 非同期型弾性表面波マッチドフィルタ

    保坂 憲生, 芝 隆司, 小川 誠一, 茂木 稔, 小田 幸司, 濱住 啓之, 渋谷 一彦

    Property Type: Patent

  56. 弾性表面波素子

    柳原 仁, 芝 隆司, 伊藤 克美, 湯原 章綱

    Property Type: Patent

  57. 弾性表面波素子

    柳原 仁, 芝 隆司, 伊藤 克美, 湯原 章綱

    特許第3330512号

    Property Type: Patent

  58. 弾性表面波装置及びそれを用いた通信装置

    湯原 章綱, 芝 隆司, 茂木 稔, 保坂 憲生, 太田 康博

    Property Type: Patent

  59. 弾性表面波装置及びそれを用いた通信装置

    湯原 章綱, 芝 隆司, 茂木 稔, 太田 康博

    Property Type: Patent

  60. 弾性表面波装置及びそれを用いた通信装置

    湯原 章綱, 芝 隆司, 茂木 稔, 太田 康博

    特許第3330510号

    Property Type: Patent

  61. スペクトル拡散通信システム

    長谷川 敬, 栗田 俊之, 芝 隆司, 湯原 章綱

    Property Type: Patent

  62. 無線画像伝送を用いた保守設備

    湯原 章綱, 茅根 修, 村田 良三, 芝 隆司, 茂木 稔, 今出 宅哉, 太田 康博

    Property Type: Patent

  63. スペクトル拡散通信装置及びスペクトル拡散通信システム

    湯原 章綱, 茂木 稔, 芝 隆司, 野田 正樹, 太田 康博

    Property Type: Patent

  64. スペクトル拡散通信装置及びスペクトル拡散通信システム

    湯原 章綱, 茂木 稔, 芝 隆司, 野田 正樹, 太田 康博

    特許第3545885号

    Property Type: Patent

  65. 無線画像伝送を用いた保守設備

    湯原 章綱, 芝 隆司, 太田 康博

    Property Type: Patent

  66. 通信装置および通信システム

    芝 隆司, 茂木 稔, 湯原 章綱, 山田 純

    Property Type: Patent

  67. 弾性表面波素子

    柳原 仁, 伊藤 克美, 芝 隆司, 湯原 章綱

    Property Type: Patent

  68. 弾性表面波素子

    柳原 仁, 伊藤 克美, 芝 隆司, 湯原 章綱

    特許第3266804号

    Property Type: Patent

  69. 通信装置および通信システム

    芝 隆司, 茂木 稔, 湯原 章綱, 柳原 仁, 太田 康博

    Property Type: Patent

  70. 無線映像信号送受信システム

    湯原 章綱, 芝 隆司, 松本 誠一郎, 西村 龍志, 茂木 稔, 今出 宅哉, 太田 康博, 村田 良三, 倉重 知行

    Property Type: Patent

  71. 弾性表面波装置とそれを用いた通信装置

    伊藤 克美, 芝 隆司, 柳原 仁

    Property Type: Patent

  72. 弾性表面波装置とそれを用いた通信装置

    伊藤 克美, 芝 隆司, 柳原 仁

    特許第3294496号

    Property Type: Patent

  73. 弾性表面波装置及びそれを用いた通信装置

    湯原 章綱, 芝 隆司, 太田 康博

    Property Type: Patent

  74. 弾性表面波素子

    柳原 仁, 伊藤 克美, 芝 隆司, 湯原 章綱

    Property Type: Patent

  75. 弾性表面波装置とそれを用いた通信装置

    伊藤 克美, 比企野 治, 芝 隆司

    Property Type: Patent

  76. 弾性表面波装置とそれを用いた通信装置

    伊藤 克美, 比企野 治, 芝 隆司

    特許第3294484号

    Property Type: Patent

  77. 無線映像信号送受信装置

    西村 龍志, 今出 宅哉, 梅澤 功一, 根本 隆一, 芝 隆司, 茂木 稔

    Property Type: Patent

  78. 無線システム

    茂木 稔, 田水 一秀, 岡島 大仁, 芝 隆司, 湯原 章綱

    Property Type: Patent

  79. 弾性表面波遅延線および通信装置および通信システム

    芝 隆司, 湯原 章綱, 太田 康博, 山田 佳弘, 茂木 稔

    Property Type: Patent

  80. 弾性表面波装置とそれを用いたテレビジョン受信機および通信装置

    比企野 治, 伊藤 克美, 芝 隆司, 小柴 正則, 長谷川 弘治

    Property Type: Patent

  81. 通信装置

    湯原 章綱, 芝 隆司, 太田 康博, 山田 佳弘, 山田 純

    Property Type: Patent

  82. 弾性表面波装置

    湯原 章綱, 芝 隆司, 太田 康博, 山田 佳弘, 山田 純

    Property Type: Patent

  83. スペクトラム拡散通信装置及び通信システム

    芝 隆司, 湯原 章綱, 山田 佳弘, 太田 康博

    Property Type: Patent

  84. 通信装置

    湯原 章綱, 芝 隆司, 太田 康博, 山田 佳弘

    Property Type: Patent

  85. 弾性表面波装置,製造方法及びそれを用いたシステム

    比企野 治, 芝 隆司, 湯原 章綱

    Property Type: Patent

  86. 弾性表面波装置

    池田 宏明, 芝 隆司

    Property Type: Patent

  87. 弾性表面波装置とこれを用いた装置

    池田 宏明, 芝 隆司, 比企野 治

    Property Type: Patent

  88. 弾性表面波装置及びそれを用いた通信装置

    湯原 章綱, 芝 隆司, 山田 佳弘, 山田 純

    Property Type: Patent

  89. 弾性表面波装置及びそれを用いた通信装置

    湯原 章綱, 芝 隆司, 山田 佳弘, 山田 純

    特許第3491349号

    Property Type: Patent

  90. 弾性表面波装置および弾性表面波装置を用いた通信装置

    芝 隆司, 山田 佳弘, 湯原 章綱, 茂木 稔

    Property Type: Patent

  91. 弾性表面波装置および弾性表面波装置を用いた通信装置

    芝 隆司, 山田 佳弘, 湯原 章綱, 茂木 稔

    特許第3435830号

    Property Type: Patent

  92. 平面型ディスプレイ及びそれを用いたシステム

    芝 隆司, 山田 佳弘, 保坂 憲生, 池田 宏明, 比企野 治, 渡辺 一志

    Property Type: Patent

  93. 弾性表面波装置とその解析方法及び解析システム

    比企野 治, 芝 隆司

    Property Type: Patent

  94. 弾性表面波装置及びそれを用いた通信装置

    湯原 章綱, 芝 隆司, 山田 純

    Property Type: Patent

  95. 弾性表面波装置

    藤田 勇次, 芝 隆司, 山田 純

    Property Type: Patent

  96. 弾性表面波装置およびそれを用いた通信装置

    池田 宏明, 芝 隆司

    Property Type: Patent

  97. 弾性表面波フィルタ

    高橋 利光, 芝 隆司, 藤田 勇次, 山田 純

    Property Type: Patent

  98. 送受信機

    茂木 稔, 芝 隆司, 田水 一秀, 岡島 大仁

    Property Type: Patent

  99. 送受信機

    茂木 稔, 芝 隆司, 田水 一秀, 岡島 大仁

    特許第3293278号

    Property Type: Patent

  100. 弾性表面波装置

    藤田 勇次, 湯原 章綱, 芝 隆司, 山田 純

    Property Type: Patent

  101. 像生成装置

    芝 隆司

    Property Type: Patent

  102. 像生成装置

    芝 隆司

    特許第3209837号

    Property Type: Patent

  103. 弾性表面波装置およびそれを用いた通信装置

    池田 宏明, 芝 隆司

    Property Type: Patent

  104. 弾性表面波装置およびそれに接続された回路およびその測定方法および通信装置

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