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Sho Muroga

Section

Graduate School of Engineering

Job title

Associate Professor

Degree

博士（工学）（東北大学）
修士（工学）（東北大学）

researchmap

https://researchmap.jp/sho.muroga

J-GLOBAL ID

201501093019116909

Research History 6

2023/04 - Present

Tohoku University　Graduate School of Engineering
2021/04 - 2023/03

Akita University　Graduate School of Engineering Science
2020/04 - 2021/03

Akita University　Graduate School of Engineering Science
2017/11 - 2020/03

Akita University　Graduate School of Engineering Science　Specially Appointed Lecturer
2015/04 - 2017/10

National Institute of Technology Toyota College　Lecturer
2012/04 - 2014/03

Tohoku University　Graduate School of Engineering　Assistant Professor

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Education 1

Tohoku University　Graduate School of Engineering　Department of Electrical and Communication Engineering

2009/04 - 2012/03

Committee Memberships 19

電子情報通信学会ソサイエティ論文誌編集委員会　査読委員

2021/03 - Present
エレクトロニクス実装学会　電磁特性技術委員会

2018/09 - Present
日本磁気学会　編集委員会編集委員

2017/07 - Present
電気学会 Society5.0に資する高周波マイクロ磁気デバイスの研究および実用化動向調査専門委員会　幹事

2023/04 - 2026/03
電気学会東北支部　会計幹事

2023/05 - 2025/06
電気学会ナノスケールソフト磁性体の創製とデバイス応用調査専門委員会　委員

2022/07 - 2025/06
電子情報通信学会環境電磁工学研究専門委員会　専門委員

2021/06 - 2025/06
電子情報通信学会・通信ソサイエティ電磁工学国際シンポジウム(2024 IEEE Joint International Symposium on Electromagnetic Compatibility, Signal & Power Integrity: EMC Japan/Asia-Pacific International Symposium on Electromagnetic Compatibility (EMC Japan/APEMC Okinawa))　Publicity and Publication Sub-Committee, Secretary

2023/02 - 2024/12
電子情報通信学会東北支部　支部委員

2022/06 - 2024/06
IEEE EMC Society Sendai Chapter　Secretary

2022/01 - 2023/12
電気学会磁性材料の高周波特性活用技術調査専門委員会　幹事補佐

2022/07 - 2023/03
電気学会磁性材料の高周波特性活用技術調査専門委員会　委員

2020/04 - 2023/03
電気学会ナノスケール磁性体を用いた機能性材料開発調査専門委員会　委員

2019/07 - 2022/06
IEEE EMC Society Sendai Chapter　Treasurer

2020/01 - 2021/12
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

2019/06 - 2021/05
電気学会ナノスケール磁性体の構造・組織解析と創製調査専門委員会　委員

2016/07 - 2019/06
平成28年度電気・電子・情報関係学会東海支部連合大会　シンポジウムオーガナイザ

2016/07 - 2016/09
東北大学電気通信研究所工学研究会スピニクス研究会　幹事

2014/04 - 2016/03
IEEE International Conference on Microwave Magnetics 2014, Organizing Committee　Secretariat

2014/03 - 2014/07

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Professional Memberships 6

光環境DX研究学会
THE MAGNETICS SOCIETY OF JAPAN
THE JAPAN INSTITUTE OF ELECTRONICS PACKAGING
THE INSTITUTE OF ELECTRICAL ENGINEERS OF JAPAN
THE INSTITUTE OF ELECTRONICS
IEEE

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Research Interests 8

ノイズ抑制シート
電波吸収体
誘電率
電磁環境両立性
磁気回路
強磁性共鳴損失
磁気回路解析
磁性膜

Research Areas 1

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

Awards 7

通信ソサイエティ活動功労賞

2023/09　電子情報通信学会
通信ソサイエティ活動功労賞

2021/09　電子情報通信学会
エレクトロニクス実装学会 MES2019 ベストペーパー賞

2020/09　エレクトロニクス実装学会　電磁ノイズ抑制体を配置したコプレーナ線路の特性インピーダンス
Best Symposium Paper Award

2015/05　2015 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)
平成26年電気学会全国大会優秀論文発表賞

2015/03　電気学会　非磁性金属を被覆した合成長繊維不織布の微細構造と電磁シールド効果に関する考察
平成23年度日本磁気学会学生講演賞（桜井講演賞）

2011　日本磁気学会　薄膜電磁ノイズ抑制体の損失極大周波数に対する反磁界の影響
優秀論文発表賞

2011　電気学会　オンチップ薄膜電磁ノイズ抑制体における損失極大周波数の反磁界による制御

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Papers 43

Effect of rare-earth doping on magnetic softness and magnetization dynamics of Fe-Ga films

Saijian Ajia, Ryuya Nishina, Takamichi Miyazaki, Sho Muroga, Yasushi Endo

AIP Advances　15　(3)　2025/03/01
Publisher: AIP Publishing
DOI： 10.1063/9.0000933 　

eISSN： 2158-3226

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This paper reports the influence of rare-earth (RE) doping on static and dynamic magnetic properties of 50-nm-thick Fe-Ga films grown on a glass substrate. With the addition of RE elements, the magnetic softness of Fe-Ga films improved at higher RE content, which might be attributed to the induction of in-plane uniaxial anisotropy by RE doping. As for the dynamic properties of Fe-Ga-RE films, an overall increased effective in-plane damping constant (α//,eff) were observed as the increase of RE content, except for a decreased α//,eff from 0.0228 to 0.0151 at low RE contents. These results suggest that the addition of RE could induce tunable magnetic properties in Fe-Ga films, making resultant Fe-Ga-RE films as one of the promising candidates for the sensing applications and high frequency microwave magnetic devices.
Study on Electrical and Magnetic Properties of Toroidal Cores Consisted of Electrolytic Iron Particles with Different Particle Shapes

Yudai Kodama, Phuong Nguyen, Takamichi Miyazaki, Sho Muroga, Yasushi Endo

IEEJ Transactions on Fundamentals and Materials　144　(6)　222-227　2024/06

DOI： 10.1541/ieejfms.144.222 　

ISSN： 0385-4205

eISSN： 1347-5533
Soft magnetic properties of Fe-Ni powder cores in the high frequency range

Mai Phuong Nguyen, Shigeyoshi Yoshida, Satoshi Okamoto, Sho Muroga, Takamichi Miyazaki, Yasushi Endo

AIP Advances　14　(1)　2024/01/01
Publisher: AIP Publishing
DOI： 10.1063/9.0000719 　

eISSN： 2158-3226
Crossed Anisotropy Multilayered Nanogranular Films Combining High Permeability, Ferromagnetic Resonance Frequency, and Resistivity Peer-reviewed

Masayuki Naoe, Makoto Sonehara, Kousuke Miyaji, Toshiro Sato, Yasushi Endo, Sho Muroga, Nobukiyo Kobayashi, Ken-Ichi Arai

IEEE Transactions on Magnetics　59　(11)　2023/06/28

DOI： 10.1109/TMAG.2023.3290179 　

ISSN： 0018-9464

eISSN： 1941-0069
Estimation of Material Characteristics of Film-Type Noise Suppressor Using Equivalent Circuit Modeling and Genetic Algorithm Peer-reviewed

Takahiro Mikami, Sho Muroga, Motoshi Tanaka, Yasushi Endo, Masayuki Naoe, Shuichiro Hashi, Kazushi Ishiyama

IEEE Transactions on Magnetics　59　(11)　2023/06/26

DOI： 10.1109/TMAG.2023.3289188 　

ISSN： 0018-9464

eISSN： 1941-0069
Influence of aging and perception tasks on EEG during step-up/down movement exercise Peer-reviewed

T. Kato, T. Hayasaka, T. Kawagoe, S. Muroga, SM. Yamashiro

(in Press)　2023/03
Effect of Si Composition on Static and Dynamic Magnetic Properties of Fe-Si Films Peer-reviewed

Ye Jiang, Sho Muroga, Takamichi Miyazaki, Yasushi Endo

IEEE Transactions on Magnetics　59　(11)　2023

DOI： 10.1109/TMAG.2023.3291687 　

ISSN： 0018-9464

eISSN： 1941-0069
An estimation method of magnetic coupling coefficient between two microstrip lines using machine learning of near-field information Peer-reviewed

Yusuke Sato, Sho Muroga, Hidefumi Kamozawa, Motoshi Tanaka

IEEE Transactions on Magnetics　59　(11)　2023

DOI： 10.1109/TMAG.2023.3302907 　

ISSN： 0018-9464

eISSN： 1941-0069
A Detection Method of Atrial Fibrillation from 24-hour Holter-ECG Using CNN Peer-reviewed

Hidefumi Kamozawa, Sho Muroga, Motoshi Tanaka

IEEJ Transactions on Electrical and Electronic Engineering　18　(4)　577-582　2023

DOI： 10.1002/tee.23756 　

ISSN： 1931-4973

eISSN： 1931-4981
Estimation of circuit parameters of MSL with Co-Zr-Nb film by magnetic circuit analysis

Mikami T., Muroga S., Tanaka M.

Transaction of the Magnetics Society of Japan Special Issues　6　(2)　111-115　2022/09/01
Publisher: The Magnetics Society of Japan
DOI： 10.20819/msjtmsj.22tr621 　

eISSN： 2432-0471

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Electrical equivalent circuit parameters of a microstrip line (MSL) with a Co-Zr-Nb film as a noise suppressor were estimated by magnetic circuit analysis. First, the magnetic flux distribution in the cross section of the MSL with Co-Zr-Nb film was theoretically calculated to determine the magnetic flux path of the magnetic circuit. Second, the circuit parameters were calculated by the magnetic circuit analysis and compared with the values obtained by S-parameter measurement. The results are in good agreement, which indicates the feasibility of the estimation of the electrical equivalent circuit parameters of the MSL with the noise suppressor using the magnetic circuit analysis with the cross-sectional dimensions and material properties.
Evaluation of transmission characteristics of differential and common modes of parallel two-conductor microstrip lines with a Co-Zr-Nb film Peer-reviewed

Masataka Masaki, Sho Muroga, Takahiro Mikami, Motoshi Tanaka

ELECTRONICS AND COMMUNICATIONS IN JAPAN　105　(4)　2022/09

DOI： 10.1002/ecj.12370 　

ISSN： 1942-9533

eISSN： 1942-9541
Effect of 3% CO<inf>2</inf> inhalation on pulmonary gas exchange kinetics during constant work-rate exercise Peer-reviewed

Takahide Kato, Sho Muroga, Stanley M. Yamashiro, Takaaki Matsumoto

Gazzetta Medica Italiana Archivio per le Scienze Mediche　181　(5)　328-336　2022/05

DOI： 10.23736/S0393-3660.20.04529-5 　

ISSN： 0393-3660

eISSN： 1827-1812
Estimation of Conductive Noise Suppression in Microstrip Line with Two Different Magnetic Films Peer-reviewed

Takahiro Mikami, Sho Muroga, Motoshi Tanaka

2022 ASIA-PACIFIC MICROWAVE CONFERENCE (APMC)　2022-November　434-436　2022
Size Parameters Classification of Loop Current Model of PCB Traces by CNN of Magnetic Near-Field Distribution Peer-reviewed

Sho Muroga, Taichi Sasaki, Hidefumi Kamozawa, Yusuke Sato, Takahiro Mikami, Motoshi Tanaka

2022 ASIA-PACIFIC MICROWAVE CONFERENCE (APMC)　2022-November　904-906　2022
Slot line waveguide induced magnetization dynamics of perpendicularly magnetized La-YIG thin film Peer-reviewed

Tetsunori Koda, Sho Muroga, Yasushi Endo

IEEE Transactions on Magnetics　58　(2)　1-1　2021

DOI： 10.1109/tmag.2021.3089769 　

ISSN： 0018-9464

eISSN： 1941-0069
Inductive decoupling between two parallel MSLs using Co-Zr-Nb film Peer-reviewed

Sho Muroga, Motoshi Tanaka

IEEJ Transactions on Fundamentals and Materials　141　(5)　301-305　2021
Publisher: The Institute of Electrical Engineers of Japan
DOI： 10.1541/ieejfms.141.301 　

ISSN： 0385-4205

eISSN： 1347-5533
Estimation of Noise Suppression in MSL with Co-Zr-Nb Film Considering Impedance Matching Peer-reviewed

Takahiro Mikami, Sho Muroga, Motoshi Tanaka, Yasushi Endo, Shuichiro Hashi, Kazushi Ishiyama

IEEE Transactions on Magnetics　58　(2)　2021

DOI： 10.1109/TMAG.2021.3087257 　

ISSN： 0018-9464

eISSN： 1941-0069
Estimation of circuit parameters of microstrip lines covered by electromagnetic noise suppressors with different geometries Peer-reviewed

Takahiro Mikami, Sho Muroga, Motoshi Tanaka

IEEJ Transactions on Fundamentals and Materials　140　(12)　595-596　2020/12/01
Publisher: The Institute of Electrical Engineers of Japan
DOI： 10.1541/ieejfms.140.595 　

ISSN： 0385-4205

eISSN： 1347-5533
Effect of Complex Permeability on Circuit Parameters of CPW with Magnetic Noise Suppression Sheet Peer-reviewed

Sho Muroga, Motoshi Tanaka, Takefumi Yoshikawa, Yasushi Endo

IEICE TRANSACTIONS ON COMMUNICATIONS　E103B　(9)　899-902　2020/09

DOI： 10.1587/transcom.2019MCP0002 　

ISSN： 0916-8516

eISSN： 1745-1345
A charge recycling stacked I/O in standard CMOS technology for wide TSV data bus Peer-reviewed

Takefumi Yoshikawa, Tatsuya Iwata, Junji Shibazaki, Sho Muroga, Hiroaki Ikeda

IEICE ELECTRONICS EXPRESS　17　(10)　20200112-20200112　2020/05

DOI： 10.1587/elex.17.20200112 　

ISSN： 1349-2543
Synchronized excitation of magnetization dynamics via spin waves in Bi-YIG thin film by slot line waveguide Peer-reviewed

Tetsunori Koda, Sho Muroga, Yasushi Endo

Applied Physics Letters　116　(10)　102403　2020/03/09

DOI： 10.1063/1.5143519 　

ISSN： 0003-6951

eISSN： 1077-3118
Crosstalk suppression of magnetic films covered by two parallel microstrip lines Peer-reviewed

Sho Muroga, Jingyan Ma, Yasushi Endo, Shuichiro Hashi, Masayuki Naoe, Motoshi Tanaka, Hiroo Yokoyama, Kazushi Ishiyama

JAPANESE JOURNAL OF APPLIED PHYSICS　58　(8)　2019/08

DOI： 10.7567/1347-4065/ab2d8d 　

ISSN： 0021-4922

eISSN： 1347-4065
Inductance Evaluation of CPW with Co-Zr-Nb Film Using Magnetic Circuit Analysis Peer-reviewed

Sho Muroga, Yasushi Endo, Motoshi Tanaka

JOURNAL OF ELECTRONIC MATERIALS　48　(3)　1342-1346　2019/03

DOI： 10.1007/s11664-018-6835-z 　

ISSN： 0361-5235

eISSN： 1543-186X
T-Type Equivalent Circuit of On-Chip Microstrip Line With Magnetic Film-Type Noise Suppressor Peer-reviewed

Sho Muroga, Yasushi Endo, Masanari Takamatsu, Hiroya Andoh

IEEE TRANSACTIONS ON MAGNETICS　54　(6)　2018/06

DOI： 10.1109/TMAG.2018.2818119 　

ISSN： 0018-9464

eISSN： 1941-0069
Analysis of Magnetic-Film-Type Noise Suppressor Integrated on Transmission Lines for On-Chip Crosstalk Evaluation Peer-reviewed

Jingyan Ma, Sho Muroga, Yasushi Endo, Shuichiro Hashi, Hiroo Yokoyama, Yoshiaki Hayashi, Kazushi Ishiyama

IEEE Transactions on Magnetics　54　(6)　2018/06

DOI： 10.1109/TMAG.2018.2812846 　

ISSN： 0018-9464

eISSN： 1941-0069
Noise suppression and crosstalk analysis of on-chip magnetic film-type noise suppressor Peer-reviewed

Jingyan Ma, Sho Muroga, Yasushi Endo, Shuichiro Hashi, Masayuki Naoe, Hiroo Yokoyama, Yoshiaki Hayashi, Kazushi Ishiyama

AIP Advances　8　(5)　056613　2018/05/01

DOI： 10.1063/1.5007315 　

ISSN： 2158-3226

eISSN： 2158-3226
A Study on Incentive Factors and Disincentive Factors of Students to Participate in Community Education for Generic Skills Development Peer-reviewed

SATO Yuya, TANAKA Kensaku, OMORI Yukiko, MUROGA Sho, ICHIKAWA Yuri, TSUZUKI Keita

Journal of JSEE　66　(3)　3_29-3_34　2018
Publisher: Japanese Society for Engineering Education
DOI： 10.4307/jsee.66.3_29 　

ISSN： 1341-2167

eISSN： 1881-0764

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This study discusses incentives and disincentives for students to participate in community education for developing their generic skills. In this study, we clarify the followings. 1) Interacting with younger people enhances students’ willingness to participate. 2) The community education was highly evaluated by the higher grade students who participate many times. 3) The issue is securing the time to participate in community education. 4) Lower grade students are not sure of whether they will continue to participate in the future activities because of other reasons such as club activities or studies. Therefore, it is important to create opportunities at an appropriate timing to encourage them to participate in ongoing community education.
Simultaneous Evaluation of Conductive/Near-Field Noise Suppression in Co-Zr-Nb Film Using Magnetic Circuit Peer-reviewed

Sho Muroga, Yasushi Endo

IEEE TRANSACTIONS ON MAGNETICS　53　(11)　8002704　2017/11

DOI： 10.1109/TMAG.2017.2705086 　

ISSN： 0018-9464

eISSN： 1941-0069
GHz Range Magnetic Field Measurement of a Coplanar Waveguide with a Magnetic Force Microscope Tip by Exploiting a Beat Signal Between the Coplanar Waveguide and an Exciting Coil Peer-reviewed

Yasushi Endo, Masaki Onishi, Sho Muroga, Kaoru Arai, Kunio Yanagi, Yutaka Shimada, Masahiro Yamaguchi

IEEE TRANSACTIONS ON MAGNETICS　50　(11)　6500604　2014/11

DOI： 10.1109/TMAG.2014.2325015 　

ISSN： 0018-9464

eISSN： 1941-0069
Performance of Crossed Anisotropy Multilayered CoZrNb Films as IC Chip Level Electromagnetic Noise Suppressor Peer-reviewed

Yutaka Shimada, Jingyan Ma, Tetsuo Ito, Kunio Yanagi, Yasushi Endo, Sho Muroga, Masahiro Yamaguchi

IEEE TRANSACTIONS ON MAGNETICS　50　(11)　2801704　2014/11

DOI： 10.1109/TMAG.2014.2331854 　

ISSN： 0018-9464

eISSN： 1941-0069
Chip Level Simulation of Substrate Noise Coupling and Interference in RF ICs with CMOS Digital Noise Emulator Peer-reviewed

Naoya Azuma, Shunsuke Shimazaki, Noriyuki Miura, Makoto Nagata, Tomomitsu Kitamura, Satoru Takahashi, Motoki Murakami, Kazuaki Hori, Atsushi Nakamura, Kenta Tsukamoto, Mizuki Iwanami, Eiji Hankui, Sho Muroga, Yasushi Endo, Satoshi Tanaka, Masahiro Yamaguchi

IEICE TRANSACTIONS ON ELECTRONICS　E97C　(6)　546-556　2014/06

DOI： 10.1587/transele.E97.C.546 　

ISSN： 1745-1353

eISSN： 1745-1353
3-D Magnetic-Near-Field Scanner for IC Chip-Level Noise Coupling Measurements Peer-reviewed

Sho Muroga, Kaoru Arai, Sandeep Dhungana, Ryosuke Okuta, Yasushi Endo, Masahiro Yamaguchi

IEEE TRANSACTIONS ON MAGNETICS　49　(7)　3886-3889　2013/07

DOI： 10.1109/TMAG.2013.2250264 　

ISSN： 0018-9464

eISSN： 1941-0069
Study of FMR Frequency Shift Through Electromagnetic Simulation and Its Application to Analyze Integrated Ferromagnetic Noise Suppressor Peer-reviewed

Sho Muroga, Yuki Asazuma, Masahiro Yamaguchi

IEEE TRANSACTIONS ON MAGNETICS　49　(7)　4032-4035　2013/07

DOI： 10.1109/TMAG.2013.2247031 　

ISSN： 0018-9464

eISSN： 1941-0069
High permeability and electromagnetic noise suppression characteristics of Fe-B-P sub-micron particle chains and their composites with NiZn-ferrite nanoparticles Peer-reviewed

Ch. Yao, Y. Shimada, S. Muroga, G. W. Qin, S. Okamoto, O. Kitakami, Y. Endo, M. Yamaguchi

JOURNAL OF ALLOYS AND COMPOUNDS　554　414-418　2013/03

DOI： 10.1016/j.jallcom.2012.11.157 　

ISSN： 0925-8388
A 60×60μm² size planar shielded loop probe for low lift-off on-chip magnetic near field measurements

Masahiro Yamaguchi, Sho Muroga, Shiori Nanba, Kaoru Arai, Kunio Yanagi, Yasushi Endo

IEEE International Symposium on Electromagnetic Compatibility　977-980　2013

ISSN： 1077-4076

eISSN： 2158-1118
Analysis of magnetic flux through magnetic film with negative permeability Peer-reviewed

S. Muroga, Y. Asazuma, Y. Endo, Y. Shimada, M. Yamaguchi

IEEE Transactions on Magnetics　48　(11)　4320-4323　2012

DOI： 10.1109/TMAG.2012.2205139 　

ISSN： 0018-9464
Evaluation of Thin Film Noise Suppressor Applied to Noise Emulator Chip Implemented in 65 nm CMOS Technology Peer-reviewed

Sho Muroga, Yasushi Endo, Wataru Kodate, Yoshiaki Sasaki, Kumpei Yoshikawa, Yuta Sasaki, Makoto Nagata, Masahiro Yamaguchi

IEEE TRANSACTIONS ON MAGNETICS　47　(10)　4485-4488　2011/10

DOI： 10.1109/TMAG.2011.2157328 　

ISSN： 0018-9464

eISSN： 1941-0069
Three-Dimensional Micro-Coil Oscillator Fabricated with Monolithic Process on LSI Peer-reviewed

YABE Tomotaka, MIMURA Yasuhiro, TAKAHASHI Hirokazu, ONOE Atsushi, MUROGA Sho, YAMAGUCHI Masahiro, ONO Takahito, ESASHI Masayoshi

IEEJ Transactions on Sensors and Micromachines　131　(10)　363-368　2011/10/01
Publisher: The Institute of Electrical Engineers of Japan
DOI： 10.1541/ieejsmas.131.363 　

ISSN： 1341-8939

eISSN： 1347-5525
Estimation of Peak Frequency of Loss in Noise Suppressor Using Demagnetizing Factor Peer-reviewed

Sho Muroga, Yasushi Endo, Yoshio Mitsuzuka, Yutaka Shimada, Masahiro Yamaguchi

IEEE TRANSACTIONS ON MAGNETICS　47　(2)　300-303　2011/02

DOI： 10.1109/TMAG.2010.2082511 　

ISSN： 0018-9464
Calculation of Eddy Current Losses in a Miniature Disk and Its Application to the Thin Film Noise Suppressor Peer-reviewed

MUROGA Sho, SHIMADA Yutaka, YAMAGUCHI Masahiro

The IEICE transactions on electronics C　94　(2)　39-44　2011/02/01
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 1345-2827

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薄膜電磁ノイズ抑制体への鎖交磁束により発生する渦電流のシート抵抗に対する変化を定量的に検討するため,円盤の膜面垂直方向に磁界を印加したモデルにおける渦電流損の計算を行った.微小円盤における渦電流損は,円盤への鎖交磁束を得ることができれば,これを電磁誘導の法則に当てはめ,円盤内の渦電流を導出することにより,解析的に計算できることを示した.この微小円盤を,薄膜電磁ノイズ抑制体の膜長及び膜幅方向に多数並べたモデルを検討した.薄膜内の渦電流の経路は,微小円盤を適用したモデルにおいて,各微小円盤内で発生する渦電流を重ね合わせることにより説明することができることを示した.以上により,微小円盤モデルが薄膜電磁ノイズ抑制体の渦電流解析に極めて有用であることを明らかにした.
Performance of Integrated Magnetic Thin Film Noise Suppressor Applied to CMOS Noise Test Chips Peer-reviewed

Masahiro Yamaguchi, Sho Muroga, Yasushi Endo, Wataru Kodate, Kumpei Yoshikawa, Yuta Sasaki, Makoto Nagata

2011 41ST EUROPEAN MICROWAVE CONFERENCE　49-52　2011

ISSN： 2325-0305
Ferromagnetic Thin Film Noise Suppressor Integrated to On-Chip Transmission Lines Peer-reviewed

Masahiro Yamaguchi, Sho Muroga, Yasushi Endo, Mitsuru Suzuki, Takayoshi Inagaki, Yoshio Mitsuzuka

IEEE TRANSACTIONS ON MAGNETICS　46　(6)　2450-2453　2010/06

DOI： 10.1109/TMAG.2010.2044763 　

ISSN： 0018-9464

eISSN： 1941-0069
RF Joule Losses Analysis in Thin Film Noise Suppressor Estimated by 3-D Equivalent Circuit Network Peer-reviewed

Sho Muroga, Masahiro Yamaguchi

IEEE TRANSACTIONS ON MAGNETICS　45　(10)　4804-4807　2009/10

DOI： 10.1109/TMAG.2009.2022494 　

ISSN： 0018-9464

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Misc. 78

Permeability estimation of magnetic film placed on MSL using equivalent magnetic and electric circuit

三上貴大, 室賀翔, 田中元志, CHAKAROTHAI J., AJIA S., 遠藤恭, 藤井勝巳

日本磁気学会学術講演概要集　48th　2024

ISSN： 1882-2959
マグネティックスケンキュウカイナノスケールコウゾウジセイタイ、エイキュウジシャク、ジセイザイリョウ、ジキオウヨウイッパン

2023　(66-82)　75-79　2023/08
Publisher: 電気学会
Control of Magnetization Precession Frequency Using Current Density of Spin-Orbit Torque Applied to Local Area Peer-reviewed

Tetsunori Koda, Ao Nakagawa, Sho Muroga, Yasushi Endo

2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers)　2023/05
Publisher: IEEE
DOI： 10.1109/intermagshortpapers58606.2023.10228553 　
Micromagnetics Simulation of Highly Efficient Oscillation of Magnetization in a Ferromagnetic Local Areas via Spin Waves Induced by Spin-Orbit Torque Peer-reviewed

Tetsunori Koda, Sho Muroga, Yasushi Endo

2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers)　2023/05
Publisher: IEEE
DOI： 10.1109/intermagshortpapers58606.2023.10228207 　
ギターコード演奏楽音のオンセット検出と認識に関する検討—A Study on Onset Detection and Chord Recognition of Sound Played by Guitar

近藤駿, 鴨澤秀郁, 室賀翔, 田中元志

音楽音響研究会資料　41　(8)　5-8　2022/12/17
Publisher: 日本音響学会
ISSN： 0912-7283
倍音をもつ発音候補の抽出によるコード認識方法に関する一検討—A Study on Chord Recognition by Extracting Tone with Its Harmonics

鴨澤秀郁, 室賀翔, 田中元志

音楽音響研究会資料　41　(8)　1-4　2022/12/17
Publisher: 日本音響学会
ISSN： 0912-7283
はしご形磁気回路を用いた伝送線路上に配置したCo-Zr-Nb膜のFMR損失の算出—Calculation of FMR loss in Co-Zr-Nb film placed on transmission line using ladder-type magnetic circuit—マグネティックス研究会高周波磁気,マイクロ磁気,磁性材料一般,磁気応用一般

三上貴大, 室賀翔, 田中元志

電気学会研究会資料. MAG = The papers of technical meeting on magnetics, IEE Japan / マグネティックス研究会 [編]　2022　(121-130)　17-21　2022/11
Publisher: 電気学会
平行2線MSL上に配置したCo-Zr-Nb膜のクロストーク抑制効果および挿入損失の形状・導電率依存性—Geometries and resistivity dependencies on crosstalk suppression and insertion loss of Co-Zr-Nb film placed on parallel two MSLs—マグネティックス研究会高周波磁気,マイクロ磁気,磁性材料一般,磁気応用一般

室賀翔, 田中元志

電気学会研究会資料. MAG = The papers of technical meeting on magnetics, IEE Japan / マグネティックス研究会 [編]　2022　(121-130)　23-27　2022/11
Publisher: 電気学会
非磁性導電性シートによる電磁ノイズ抑制効果—特集電波吸収体,シールド材料,ノイズ対策部品の開発動向

室賀翔, 田中元志

車載テクノロジー = Automotive technology / 技術情報協会編　10　(2)　39-43　2022/11
Publisher: 技術情報協会
ISSN： 2432-5694
Evaluation of Transmission Characteristics of Differential and Common Modes of Parallel Two-Conductor Microstrip Lines with a Co-Zr-Nb Film

Masataka Masaki, Sho Muroga, Takahiro Mikami, Motoshi Tanaka

IEEJ Transactions on Fundamentals and Materials　142　(6)　283-287　2022
Publisher: The Institute of Electrical Engineers of Japan
DOI： 10.1541/ieejfms.142.283 　

ISSN： 0385-4205

eISSN： 1347-5533
Shielding and Absorption Mechanism of Electromagnetic Noise Suppressors in GHz Frequency Range

まぐね = Magnetics Japan　16　(5)　252-259　2021
Publisher: 日本応用磁気学会
ISSN： 1880-7208
Inductive Noise De-coupling Using Ferromagnetic Resonance of Magnetic Films for Next-generation Mobile Devices

室賀翔

村田学術振興財団年報　(34)　2020

ISSN： 0919-3383
Magnetization dynamics in yttrium iron garnet single crystal thin films induced by slot line waveguides

Koda Tetsunori, Sho Muroga, Yasushi Endo

JSAP Annual Meetings Extended Abstracts　2019.2　2164-2164　2019/09/04
Publisher: The Japan Society of Applied Physics
DOI： 10.11470/jsapmeeting.2019.2.0_2164 　

eISSN： 2436-7613
Highly sensitive magnetic field sensing using magnetization dynamics in yttrium iron garnet single-crystal thin films Peer-reviewed

Tetsunori Koda, Sho Muroga, Yasushi Endo

IEEE Transactions on Magnetics　55　(7)　2222-2222　2019/07

DOI： 10.1109/TMAG.2019.2895470 　

ISSN： 0018-9464

eISSN： 1941-0069
電磁ノイズ抑制のためのCo-Zr-Nb膜を配置したCPWの配線抵抗

室賀翔, 遠藤恭, 田中元志

電子情報通信学会大会講演論文集(CD-ROM)　2019　2019

ISSN： 1349-144X
金属被覆した不織布の平面電磁波吸収特性

佐野巧, 室賀翔, 田中元志, 倉林徹, 淀川信一, 小尾留美名, 加藤一史

日本表面真空学会東北・北海道支部学術講演会講演予稿集　2018　2019
Basic study on multilayer technique of nanogranular films for steady AC resistance at SHF band

2018　(156)　1-6　2018/11/27
Publisher: 電気学会
Design of multi-disciplinary framework for improving generic skills and practical education in a depopulated mountainous area Peer-reviewed

Y. Omori, T. Ohata, K. Tanaka, Y. Sato, S. Muroga, K. Tsuzuki, Y. Ichikawa, Y. Mizuguchi

12th International Symposium on Advances in Technology Education (ISATE2018)　2018/09
(CoPd-CaF₂)/(CaF₂)ナノグラニュラー積層膜のGHz帯高周波複素透磁率とノイズ抑制効果—(CoPd-CaF₂)/(CaF₂) Nanogranular Multilayers : Complex Permeability and Noise Suppression in GHz Region—マグネティックスリニアドライブ合同研究会高周波磁気デバイス,高周波磁性材料,マイクロ電源,磁気センサ,リニアモータ・アクチュエータ,リニアドライブ技術一般,および磁気応用一般

直江正幸, 遠藤恭, 宮崎孝道, 室賀翔, 馬静言, 枦修一郎, 石山和志

電気学会研究会資料. MAG = The papers of technical meeting on magnetics, IEE Japan / マグネティックス研究会 [編]　2018　(62-80)　51-56　2018/08
Publisher: 電気学会
磁性膜を配置したMSLの回路定数の計測と特性解析

室賀翔, 遠藤恭, 安藤浩哉, 田中元志

電気学会全国大会講演論文集(CD-ROM)　2018　2018
コプレーナ線路に配置したCo-Zr-Nb膜の回路定数への影響

室賀翔, 遠藤恭, 田中元志

電気関係学会東北支部連合大会講演論文集　2018　(0)　224-224　2018
Publisher: 電気関係学会東北支部連合大会実行委員会
DOI： 10.11528/tsjc.2018.0_224 　
Mechanism and design of magnetic sheet-/film-type noise suppressor Peer-reviewed

Sho Muroga, Yasushi Endo, Motoshi Tanaka

Journal of Japan Institute of Electronics Packaging　21　(7)　635-639　2018
Publisher: The Japan Institute of Electronics Packaging
DOI： 10.5104/jiep.21.635 　

ISSN： 1343-9677

eISSN： 1884-121X
Magnetic circuit evaluation of conductive and near-field noise suppression using Co-Zr-Nb film Peer-reviewed

S. Muroga, Y. Endo

2017 IEEE International Magnetics Conference, INTERMAG 2017　2017/08/10

DOI： 10.1109/INTMAG.2017.8007826 　
Performance of Flexible Noise Suppressor for IoT Devices Made Only of Meltblown Non-Woven Fabric

Masahiro Yamaguchi, Jiang Fu, Sho Muroga, Tomoya Tanaka, Chie Okamura, Lumina Obi, Kazufumi Kato

2017 ASIA-PACIFIC INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (APEMC)　25-27　2017

DOI： 10.1109/APEMC.2017.7975414 　

ISSN： 2162-7673
Effects of an Urban-Rural Exchange program in a Hilly and Mountainous Area on Urban Children and their Parents:- the Case of "Dormitown" Project in NITTC -

大森有希子, 室賀翔, 佐藤雄哉, 田中健作

Journal of National Institute of Technology, Toyota College　49　(0)　n/a　2017
Publisher: National Institute of Technology, Toyota College
DOI： 10.20692/toyotakosenkiyo.10 　

ISSN： 0286-2603

eISSN： 2424-2276

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Depopulation in rural areas and decline of local industries have become a serious problem in Japan. As one possible step to improve this situation, the "Dormitown" project in National Institute of Technology, Toyota College (NITTC) carried out a summer school for urban children in a hilly and mountainous area. In this paper, we evaluate effects of the school on participating children and their parents with a questionnaire survey. It is presented that the project can give educational experience and evoke interests in rural areas from children. These results indicate possibilities of our approach to contribute a regional vitalization.
A Study of Interdisciplinary Research and Education Based on Rural Revitalization in Hilly and Mountainous Areas and Its Evaluation:-The Case of "Dormitown"Project in NITTC-

MUROGA Sho, SATO Yuya, TANAKA Kensaku, OMORI Yukiko

Journal of National Institute of Technology, Toyota College　49　(0)　n/a　2017
Publisher: National Institute of Technology, Toyota College
DOI： 10.20692/toyotakosenkiyo.3 　

ISSN： 0286-2603

eISSN： 2424-2276

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This paper evaluates and discusses the "Dormitown" project in National Institute of Technology, Toyota College (NITTC) by a questionnaire for NITTC staff. As a result, it is clarified that the project is successfully developed and produced an interdisciplinary research/education system and a regional-development environment. It is expected that this study is not limited to the feedback of "Dormitown" project, but applied also to future rural revitalization by industry/academia/government cooperation.
Study on the Evaluation and Problem of Activity by Local Residents:-The Case of "Dormitown" Project in NITTC-

佐藤雄哉, 田中健作, 大森有希子, 室賀翔

Journal of National Institute of Technology, Toyota College　49　(0)　n/a　2017
Publisher: National Institute of Technology, Toyota College
DOI： 10.20692/toyotakosenkiyo.4 　

ISSN： 0286-2603

eISSN： 2424-2276

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This study describes the evaluation of exchange activity in hilly and mountainous area by local residents.It was clarified that the local residents have high evaluation and wish continuation of exchange activity. On the other hand, the local residents holds dissatisfaction on announcement. Furthermore, it was clarified that the participants of exchange activity have also high evaluation to activity. They wish the exchange activity with children of the same generation in urban area.
Setting up a Hands-on Education Program in a Mountainous Village with the Involvement of all Generations both Rural and Urban:-The Case of "Dormitown" Project in NITTC-

田中健作, 大森有希子, 室賀翔, 佐藤雄哉

Journal of National Institute of Technology, Toyota College　49　(0)　n/a　2017
Publisher: National Institute of Technology, Toyota College
DOI： 10.20692/toyotakosenkiyo.17 　

ISSN： 0286-2603

eISSN： 2424-2276
Shielding Effectiveness of Meltblown Non-Woven Thin Fabric type Noise Suppressor

付江, 山口正洋, 室賀翔, 田中智也, 岡村知恵, 小尾留美名, 加藤一史

電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　116　(223)　47-52　2016/09/16
Publisher: 電子情報通信学会
ISSN： 0913-5685
Shielding Effectiveness of Meltblown Non-Woven Fabric Type Non-Magnetic Noise Suppressor (The Papers of Joint Technical Meeting on Electromagnetic Compatibility and Magnetics, IEE Japan : EMC Joint Workshop, 2016, Taipei)

2016　(18)　5-9　2016/06/02
Publisher: 電気学会
Shielding Effectiveness of Meltblown Non-Woven Fabric Type Non-Magnetic Noise Suppressor (Electromagnetic Compatibility)

116　(72)　5-9　2016/06/02
Publisher: 電子情報通信学会
ISSN： 0913-5685
Development of Meltblown Non-Woven Fabric Type Non-Magnetic Noise Suppressor

Jiang Fu, Masahiro Yamaguchi, Tomoya Tanaka, Chie Okamura, Lumina Obi, Kazufumi Kato, Sho Muroga

2016 ASIA-PACIFIC INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (APEMC)　656-658　2016

DOI： 10.1109/APEMC.2016.7522827 　

ISSN： 2162-7673
Effects of On-Board Noise Remedy at IC Chip Level Noise Reduction : A Case Study in LTE-Class IC Chip

KOUSAKA Junpei, SHIMAZAKI Shunsuke, MIURA Noriyuki, MUROGA Sho, TANAKA Satoshi, YAMAGUCHI Masahiro, NAGATA Makoto

IEICE technical report. Electromagnetic compatibility　114　(503)　35-40　2015/03/06
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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Digital circuits in a mobile communication IC Chip become more enormous for LTE class design. This potentially causes the undesigned noise coupling in the receiver circuit and leads to the deterioration of overall system communication quality. In this study, noise reduction techniques have been explored. A prototype chip having a digital noise generator, LTE-class wireless receiver circuit and on-chip voltage waveform monitor, EMI tester, and the system level simulator for measuring communication quality are prepared for this study. We measured and analyzed the effect of three terminal capacitor on the chip and board level noise coupling. As a result, it exhibits a noise reduction effect of 5dB at the system level in the 2GHz band used in LTE. This will improve communication quality.
On-Chip and On-Board RF Noise Coupling and Impacts on LTE Wireless Communication Performance

Makoto Nagata, Noriyuki Miura, Sho Muroga, Satoshi Tanaka, Masahiro Yamaguchi

2015 IEEE INTERNATIONAL SYMPOSIUM ON RADIO-FREQUENCY INTEGRATION TECHNOLOGY (RFIT)　7-9　2015

DOI： 10.1109/RFIT.2015.7377869 　
Analysis of On-Chip Digital Noise Coupling Path for Wireless Communication IC Test Chip

Satoshi Tanaka, Peng Fan, Jingyan Ma, Hanae Aoki, Masahiro Yamaguchi, Makoto Nagata, Sho Muroga

2015 10th International Workshop on the Electromagnetic Compatibility of Integrated Circuits　216-221　2015

DOI： 10.1109/EMCCompo.2015.7358360 　
Radiated and Conductive Noise Suppression of Non-magnetic Metal-coated Non-woven Fabric

Tomoya Tanaka, Chie Okamura, Shinichi Okajima, Kazufumi Kato, Sho Muroga, Yuki Asazuma, Masahiro Yamaguchi

2015 ASIA-PACIFIC INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (APEMC)　532-535　2015

DOI： 10.1109/APEMC.2015.7175408 　

ISSN： 2162-7673
On-chip Integrated Magnetic Thin-Film Solution to Countermeasure Digital Noise on RF IC

Masahiro Yamaguchi, Satoshi Tanaka, Yasushi Endo, Sho Muroga, Makoto Nagata

2015 ASIA-PACIFIC INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (APEMC)　536-539　2015

DOI： 10.1109/APEMC.2015.7175409 　

ISSN： 2162-7673
Analysis of intra-chip degital noise coupling path in fully LTE compliant RF receiver test chip

Masahiro Yamaguchi, Peng Fan, Satoshi Tanaka, Makoto Nagata, Sho Muroga

2015 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (EMC)　2015-Septmber　1007-1011　2015

DOI： 10.1109/ISEMC.2015.7256304 　

ISSN： 2158-110X

eISSN： 2158-1118
Electromagnetic Field Simulation of Power Losses in Electromagnetic Noise Suppressor

山口正洋, 室賀翔

まぐね　10　(1)　23-29　2015
Publisher: 日本応用磁気学会
ISSN： 1880-7208
On-chip magnetic thin-film noise suppressor for IC chip level digital noise countermeasure

Masahiro Yamaguchi, Yasushi Endo, Satoshi Tanaka, Tetsuo Ito, Sho Muroga, Naoya Azuma, Makoto Nagata

IEEE International Symposium on Electromagnetic Compatibility　2014-December　354-357　2014/12/23

ISSN： 1077-4076

eISSN： 2158-1118
Effect of demagnetizaing field on frequency dispersoin of complex permeability

Sho Muroga, Masahiro Yamaguchi

IEEE International Symposium on Electromagnetic Compatibility　2014-December　785-788　2014/12/23

ISSN： 1077-4076

eISSN： 2158-1118
高分解能RF電磁界プローブに関する研究 (特集 ICチップレベルの低ノイズ化)

遠藤恭, 室賀翔, 荒井薫

EMC : electro magnetic compatibility : solution technology : 電磁環境工学情報　27　(6)　22-30　2014/10
Publisher: [科学情報出版]
ISSN： 0916-2275
Study on high resolution electromagnetic probe Invited

Yasushi Endo, Sho Muroga, Kaoru Arai, Yojiro Shigeta, Masahiro Yamaguchi

Solution Tchnology EMC　(318)　49-52　2014/10

ISSN： 0916-2275
Electromagnetic shielding effectiveness of non-magnetic metal coated non-woven fabric noise suppressor

Sho Muroga, Yuki Asazuma, Masahiro Yamaguchi, Tomoya Tanaka, Chie Okamura, Shin Ichi Okajima, Kazufumi Kato

IEEE International Symposium on Electromagnetic Compatibility　2014-September　(September)　134-137　2014/09/15

DOI： 10.1109/ISEMC.2014.6898957 　

ISSN： 1077-4076

eISSN： 2158-1118
Analysis of Conductive and Inductive Noise Couplings on TEG Chip with Magnetic Thin Film

MUROGA Sho, FAN Peng, TANAKA Satoshi, KITAMRA Tomomitsu, MATSUI Hiroaki, AZUMA Naoya, SHIMAZAKI Shunsuke, KOSAKA Junpei, NAGATA Makoto, YAMAGUCHI Masahiro

IEICE technical report. Electromagnetic compatibility　114　(93)　55-58　2014/06/20
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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The integrated simulation was constructed using the full wave 3-dimensional electromagnetic field simulator and the circuit analysis in order to analyze the mechanism of the on-chip conductive and the inductive noise coupling in LTE-class RFIC. From the constructed simulation, the main EM noise coupling on the chip revealed as the conductive and the inductive noise coupling. Furthermore, the noise suppression mechanism using the magnetic thin film was discussed.
Conductive Noise Suppression in the MSL using the Metal-Coated Non-Woven Fabric with High Sheet Resistance

Muroga Sho, Asazuma Yuki, Yamaguchi Masahiro, Tanaka Tomoya, Okamura Chie, Okajima Shinichi, Kato Kazufumi

IEICE technical report. Electromagnetic compatibility　113　(494)　7-10　2014/03/14
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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As a solution to on-board-level the electromagnetic compatibility problem, a metal-coated non-woven fabric with high sheet resistance is proposed. In this paper, we compared the conductive noise suppression in a microstripline (MSL), which was prepared with reference to the IEC62333-2, using the 80 x 80 mm sized non-woven fabric and 80 x 80 mm sized continuous conductors to clarify whether there is the difference and to clarify what the factor that makes the difference. As a result of this, we showed that there is the difference in the loss in the MSL when the direction of fibers of the nonwoven fabric is perpendicular and parallel to the direction of the signal line. In addition to this, we showed that the loss in the MSL using the non-woven fabric is 16% greater than the loss in the MSL using continuous conductors from 0.4 to 1.5 GHz.
Electromagnetic Shielding Effectiveness of Non-magnetic Metal Coated Non-woven Fabric Noise Suppressor

Sho Muroga, Yuki Asazuma, Masahiro Yamaguchi, Tomoya Tanaka, Chie Okamura, Shin-ichi Okajima, Kazufumi Kato

2014 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (EMC)　134-137　2014

ISSN： 2158-110X
Effect of Demagnetizaing Field on Frequency Dispersoin of Complex Permeability

Sho Muroga, Masahiro Yamaguchi

2014 INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY, TOKYO (EMC'14/TOKYO)　785-788　2014

ISSN： 2158-110X
On-Chip Magnetic Thin-Film Noise Suppressor for IC Chip Level Digital Noise Countermeasure

Masahiro Yamaguchi, Yasushi Endo, Satoshi Tanaka, Tetsuo Ito, Sho Muroga, Naoya Azuma, Makoto Nagata

2014 INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY, TOKYO (EMC'14/TOKYO)　354-357　2014

ISSN： 2158-110X
Analysis of Conductive and Inductive Noise Suppression by Multilayered Co-Zn-Nb Film Integrated on MSL

Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2014　(0)　7-7　2014
Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan
DOI： 10.11528/tsjc.2014.0_7 　
Magnetic Materials and IC Chip Level EMC

YAMAGUCHI Masahiro, MUROGA Sho, ENDO Yasushi, NAGATA Makoto, TANAKA Satoshi

IEICE technical report. Electromagnetic compatibility　113　(261)　87-92　2013/10/24
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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A technological challenge of LTE(Long Term Evolution) class RFIC is to solve desensitization of receiver circuit caused by the harmonics of clock signal of RF-digital circuits implemented in the in the same IC chip. This problem turns out to be noticeable as the degital assist technique for Si-CMOS circuit becomes popular. This paper explains a new technology to suppress electric current-driven noise on IC chip by utilizing ferromagnetic resonance losses of magnetic thin film in a popular LTE downlink frequency band of 2GHz range. The in-band spurius level was suppressed by 10dB while keeping the Throughput fraction higher than 95%.
Magnetic Materials and IC Chip Level EMC

YAMAGUCHI Masahiro, MUROGA Sho, ENDO Yasushi, NAGATA Makoto, TANAKA Satoshi

IEICE technical report. Electromagnetic compatibility　113　(259)　87-92　2013/10/24
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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A technological challenge of LTE(Long Term Evolution) class RFIC is to solve desensitization of receiver circuit caused by the harmonics of clock signal of RF-digital circuits implemented in the in the same IC chip. This problem turns out to be noticeable as the degital assist technique for Si-CMOS circuit becomes popular. This paper explains a new technology to suppress electric current-driven noise on IC chip by utilizing ferromagnetic resonance losses of magnetic thin film in a popular LTE downlink frequency band of 2GHz range. The in-band spurius level was suppressed by 10dB while keeping the Throughput fraction higher than 95%.
Influence of Sheet Resistance on Electric Field Attenuation using Metal Coated Non-woven Fabric

YAMAGUCHI Masahiro, MUROGA Sho, ASAZUMA Yuki

IEICE technical report. Electromagnetic compatibility　2013　(19)　51-56　2013/06/21
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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This paper describes that the ferromagnetic resonance (FMR) frequency shift can be calculated by an electromagnetic field simulator based on the Maxwell's equation although the relative permeability and the FMR frequency is defined by the Landau-Lifshitz-Gilbert (LLG) and the Kittel's equation. We evaluate the magnetic circuit model with the leakage magnetic flux path for considering the demagnetizing field generated in the magnetic film. As the result, we clarify that the effect of the demagnetizing field is considered as a reluctance of the leakage magnetic flux path in the magnetic circuit calculation, which is considered as the increase of anisotropy field in the Kittel's equation. Furthermore, we show that the simulated FMR frequency by the electromagnetic simulator agrees with the measured values.
Influence of Sheet Resistance on Electric Field Attenuation using Metal Coated Non-woven Fabric

MUROGA Sho, ASAZUMA Yuki, TANAKA Tomoya, OKAMURA Chie, OKAJIMA Shinichi, KATO Kazufumi, YAMAGUCHI Masahiro

IEICE technical report. Electromagnetic compatibility　2013　(19)　63-68　2013/06/21
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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The metal coated non-woven fabrics is proposed as a solution to on-board-level the electromagnetic compatibility problem. This paper discussed the shielding effectiveness and Joule loss of the metal coated non-woven fabric using an electrical circuit analysis and full wave electromagnetic field simulation. Shielding effectiveness of the non-woven fabric is essentially equivalent to that of the continuous film and can be estimated with sheet resistance defined as the quotient of thickness and resistivity of the non-woven fabrics. Oh the other hand, noise suppression in near field can be obtained with the circuit model using the capacitances of between non-woven fabrics.
Fabrication of power micro-inductor using CoFeSiB flat particles

SATO Hiroyuki, ENDO Yasushi, MUROGA Sho, YAMAGUCHI Masahiro, KATO Naoya

電気学会研究会資料. MAG, マグネティックス研究会　2013　(48)　35-40　2013/06/13
Magnetic Shielding Effect of Nonwoven Fabric Coated with Aluminum

Muroga Sho, Endo Yasushi, Ito Tetsuo, Tanaka Satoshi, Murakami Motoki, Hori Kazuaki, Takahashi Satoru, Naoya Azuma, Nagata Makoto, Yamaguchi Masahiro

IEICE technical report. Electromagnetic compatibility　112　(468)　91-95　2013/03/08
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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A long term evolution (LTE)-class CMOS radio frequency integrated circuit (RFIC) receiver test element group (TEG) chip is developed in our project for the next generation cell phone handsets in order to clarify the on-chip-level noise coupling and demonstrate the noise attenuation using the soft magnetic thin film as an on-chip electromagnetic noise suppressor. The TEG chip equips a noise generator and a RF receiver block. The RF block amplifies and demodulates transmitted signals to IQ signals. A Co_<85>Zr_3Nb_<12> soft magnetic thin film is integrated onto the TEG chip as a noise suppressor. In this report. the noise generator is driven by a clock signal of 1 24.803 MHz and generates 17th harmonics of 2,165MHz conflicts with the LTE band 1 (2,110-2,170MHz). As a result. the in-band digital noise was suppressed 5-20dB by the Co-Zr-Nb thin film as an integrated noise suppressor.
Magnetic Shielding Effect of Nonwoven Fabric Coated with Aluminum

37　(14)　91-95　2013/03
Publisher: 映像情報メディア学会
ISSN： 1342-6893
In-Band Spurious Attenuation in LTE-Class RFIC Chip using a Soft Magnetic Thin Film

Sho Muroga, Yasushi Endo, Tetsuo Ito, Satoshi Tanaka, Motoki Murakami, Kazuaki Hori, Satoru Takahashi, Azuma Naoya, Tetsuya Makita, Satoshi Imai, Makoto Nagata, Masahiro Yamaguchi

2013 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (EMC)　657-661　2013

DOI： 10.1109/ISEMC.2013.6670493 　

ISSN： 2158-110X

eISSN： 2158-1118
Frequency Dependence of Conductive and Inductive Noise Suppression of Magnetic Thin Film on Microstrip Line

Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2013　(0)　113-113　2013
Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan
DOI： 10.11528/tsjc.2013.0_113 　
Effect of Line Impedance to Conductive Noise Suppression by Magnetic Film Integrated on Parallel Line

Kuraishi Kiyoto, Muroga Sho, Asazuma Yuki, Yamahuchi Masahiro

Proceedings of JIEP Annual Meeting　27　(0)　461-463　2013
Publisher: The Japan Institute of Electronics Packaging
DOI： 10.11486/ejisso.27.0_461 　
Electromagnetic Shielding Effectiveness by Metal Coated Non-woven Fabric

Asazuma Yuki, Muroga Sho, Tanaka Tomoya, Okamura Chie, Okajima Shinichi, Kato Kazufumi, Yamaguchi Masahiro

Proceedings of JIEP Annual Meeting　27　(0)　77-80　2013
Publisher: The Japan Institute of Electronics Packaging
DOI： 10.11486/ejisso.27.0_77 　
Development of 3-D Magnetic Near Field Scanner for IC Chip-Level Noise Coupling Evaluation

Shigeta Yojiro, Muroga Sho, Arai Kaoru, Dhungana Sandeep, Okuta Ryosuke, Endo Yasuhsi, Yamaguchi Masahiro

Proceedings of JIEP Annual Meeting　27　(0)　445-447　2013
Publisher: The Japan Institute of Electronics Packaging
DOI： 10.11486/ejisso.27.0_445 　
LTE In-Band Noise Suppression by Magnetic Thin Film Integrated on TEG Chip

Muroga Sho, Nagata Makoto, Yamaguchi Masahiro, Fan Peng, Endo Yasushi, Ito Tetsuo, Murakami Motoki, Hori Kazuaki, Takahashi Satoshi, Tanaka Satoshi, Azuma Naoya

Proceedings of JIEP Annual Meeting　27　(0)　67-68　2013
Publisher: The Japan Institute of Electronics Packaging
DOI： 10.11486/ejisso.27.0_67 　
FMR Frequency Shift of Magnetic Thin Film Noise Suppressor through Electromagnetic Simulation

MUROGA Sho, ASAZUMA Yuki, YAMAGUCHI Masahiro

電気学会研究会資料. MAG, マグネティックス研究会　2012　(169)　57-61　2012/12/20
Three-dimensional microcoil oscillator fabricated with monolithic process on LSI

Tomotaka Yabe, Yasuhiro Mimura, Hirokazu Takahashi, Atsushi Onoe, Sho Muroga, Masahiro Yamaguchi, Takahito Ono, Masayoshi Esashi

ELECTRONICS AND COMMUNICATIONS IN JAPAN　95　(11)　49-56　2012/11

DOI： 10.1002/ecj.11404 　

ISSN： 1942-9533

eISSN： 1942-9541
Performance of Inter Decoupling by Magnetic Thin Film Noise Suppressor Integrated to LSI Chip

MUROGA Sho, KODATE Wataru, ENDO Yasushi, YAMAGUCHI Masahiro

IEICE technical report. Electromagnetic compatibility　112　(12)　31-36　2012/04/13
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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New measurement method for L-coupling on the basis of the IEC standard to evaluate the sheet type ferromagnetic noise suppressor is proposed. Performance of magnetic thin-film is evaluated as a candidate for on-chip noise suppressor. Miniature loops coils implemented on a 90 nm design test element group (TEG) chip are used as the noise transmitter and receiver. Differential transmission parameter S_<dd21> is evaluated as a measure of inductive noise intra-decoupling. Magnetic film is useful for frequency selective noise decoupler. The coupling is supported most at the ferromagnetic resonance (FMR) frequency, which is deviated from its intrinsic frequency and the degree of deviation can be calculated by using characteristic length. These results demonstrate that the proposed method is useful to characterize the IC chip level noise suppressor in the GHz range.
Control of Loss Peak Frequency in On-Chip Ferromagnetic Noise Suppressor by Demagnetizing Field

MUROGA Sho, ENDO Yasushi, MITSUZUKA Yoshio, SHIMADA Yutaka, YAMAGUCHI Masahiro

電気学会研究会資料. MAG, マグネティックス研究会　2010　(79)　53-58　2010/08/02
Modeling of magnetic characteristics of a power inductor for DC-DC converter application by means of coupling electromagnetic analysis and permeability analysis

LU Yan, MUROGA Sho, YAMAGUCHI Masahiro, CHATANI Kenichi

電気学会研究会資料. MAG, マグネティックス研究会　2009　(86)　7-12　2009/09/25
半導体素子レベル低ノイズ化を目的としたオンチップ伝送線路における磁性薄膜電磁ノイズ抑制体の基礎特性評価—Evaluation of ferromagnetic thin film RF noise suppressor applied to on-chip transmission lines for the purpose of noise suppression in semiconductor devices—環境電磁工学

室賀翔, 遠藤恭, 鈴木充

電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　109　(185)　7-12　2009/09/04
Publisher: 電子情報通信学会
ISSN： 0913-5685
2.5 mm角チップ上に集積化した磁性薄膜電磁ノイズ抑制体の評価

室賀翔, 遠藤恭, 鈴木充, 稲垣孝嘉, 三束芳央, 山口正洋

電気関係学会東北支部連合大会講演論文集　2009　(0)　244-244　2009
Publisher: 電気関係学会東北支部連合大会実行委員会
DOI： 10.11528/tsjc.2009.0_244 　
Calculation of Eddy Current Losses in a Thin Film Noise Suppressor Taking Account of Cross-Sectional and In-Plane Eddy Currents

MUROGA Sho, YAMAGUCHI Masahiro

電気学会研究会資料. MAG, マグネティックス研究会　2008　(191)　37-42　2008/12/18
Analysis Calculation of Eddy Current Losses In A Miniature Disk And Discussion About Its Application To A Thin-Film Noise Suppressor

MUROGA Sho, SHIMADA Yutaka, YAMAGUCHI Masahiro

電気学会研究会資料. MAG, マグネティックス研究会　2008　(84)　67-72　2008/07/31
Consideration on Physical Mechanism of The Optimum Sheet Resistance for Thin-Film Electromagnetic Noise Suppressor

MARUTA Kaori, MUROGA Sho, YAMAGUCHI Masahiro

電気学会研究会資料. MAG, マグネティックス研究会　2007　(42)　37-40　2007/07/12
Frequency Characteristics of the Eddy Current Losses in a Noise Suppression Film calculated using a Disk Model

MUROGA Sho, MARUTA Kaori, SHIMADA Yutaka, YAMAGUCHI Masahiro

IEICE technical report　107　(107)　57-62　2007/06/15
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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We have clarified through experiments and three-dimensional (3-D) finite-element method (FEM) electromagnetic field simulation that there is an optimum sheet resistance that maximize the loss in thin-film RF noise suppression films. In this paper the mechanism of optimum sheet resistance was analyzed based on analytical calculation, as well as 3-D FEM simulation as the reference. A disk model Was employed so that the eddy current losses generated by signal-line current and hence the flux linkage perpendicularly to the film plane can be analyzed. Eddy current losses and the optimum sheet resistance which maximize high harmonic losses in the disk model were qualitatively agreed between the two calculations.
B-4-88 Eddy Current Loss Analysis of Thin-Film RF Integrated Noise Suppressor

Muroga Sho, Maruta Kaori, Yamaguchi Masahiro

Proceedings of the IEICE General Conference　2007　(1)　412-412　2007/03/07
Publisher: The Institute of Electronics, Information and Communication Engineers
Discussion for Effective Use of Integrated Thin Film Type RF Noise Suppressors

MARUTA Kaori, MUROGA Syo, SHIMADA Yutaka, YAMAGUCHI Masahiro

IEICE technical report　106　(323)　25-30　2006/10/19
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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This paper discusses about frequency and size dependence on the optimum sheet resistance of RF noise suppression films, which maximize high harmonic losses in transmission lines, using three-dimensional (3-D) finite-element method (FEM) electromagnetic field simulation. In the simulation model, noise suppression films with sheet resistance of 10^0〜10^6Ω/square were put on top of a microstrip-line. Based on simulated results of eddy currents in the film, mechanism of optimum sheet resistance was analyzed. At 0.5, 2,5 and 10GHz, simulated maximum power losses of the microstrip-line were 0.06 with sheet resistance of 2000Ω/square, 0.19 with sheet resistance of 1000Ω/square, 0.34 with sheet resistance of 400Ω/square and 0.49 with sheet resistance of 200Ω/square. With increasing of the film length, the optimum sheet resistance is fixed and power losses increase proportional to the length. With increasing of the film width, the optimum sheet resistance shift to lower value and power losses increase. With increasing of the film thickness, both the optimum sheet resistance and power losses are almost same for all thicknesses. Designing a magnetic film based on optimum sheet resistance and ferromagnetic resonance, the simulated power loss reached 0.53, which was increased by 63% compared with nonmagnetic film.
Discussion for Effective Use of Integrated Thin Film Type RF Noise Suppressors

MARUTA Kaori, MUROGA Syo, SHIMADA Yutaka, YAMAGUCHI Masahiro

IEICE technical report　106　(322)　25-30　2006/10/19
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN： 0913-5685

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This paper discusses about frequency and size dependence on the optimum sheet resistance of RF noise suppression films, which maximize high harmonic losses in transmission lines, using three-dimensional (3-D) finite-element method (FEM) electromagnetic field simulation. In the simulation model, noise suppression films with sheet resistance of 10^0〜10^6Ω/square were put on top of a microstrip-line. Based on simulated results of eddy currents in the film, mechanism of optimum sheet resistance was analyzed. At 0.5, 2,5 and 10GHz, simulated maximum power losses of the microstrip-line were 0.06 with sheet resistance of 2000Ω/square, 0.19 with sheet resistance of 1000Ω/square, 0.34 with sheet resistance of 400Ω/square and 0.49 with sheet resistance of 200Ω/square. With increasing of the film length, the optimum sheet resistance is fixed and power losses increase proportional to the length. With increasing of the film width, the optimum sheet resistance shift to lower value and power losses increase. With increasing of the film thickness, both the optimum sheet resistance and power losses are almost same for all thicknesses. Designing a magnetic film based on optimum sheet resistance and ferromagnetic resonance, the simulated power loss reached 0.53, which was increased by 63% compared with nonmagnetic film.
Discussion for Optimum Sheet Resistance for Integrated Type RF Electromagnetic Noise Suppressors using Magnetic Films

丸田佳織, 室賀翔, 菅原雅也, 島田寛, 山口正洋

日本応用磁気学会学術講演概要集　30th (CD-ROM)　2006

ISSN： 1340-8100

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Books and Other Publications 1

電波吸収体・電磁波シールド材の開発最前線

橋本, 修

シーエムシー出版　2020/07

ISBN: 9784781315133

Presentations 181

マグネティックスケンキュウカイナノスケールコウゾウジセイタイ、エイキュウジシャク、ジセイザイリョウ、ジキオウヨウイッパン

2023/08
ギターコード演奏楽音のオンセット検出と認識に関する検討—A Study on Onset Detection and Chord Recognition of Sound Played by Guitar

近藤駿, 鴨澤秀郁, 室賀翔, 田中元志

音楽音響研究会資料　2022/12/17
倍音をもつ発音候補の抽出によるコード認識方法に関する一検討—A Study on Chord Recognition by Extracting Tone with Its Harmonics

鴨澤秀郁, 室賀翔, 田中元志

音楽音響研究会資料　2022/12/17
はしご形磁気回路を用いた伝送線路上に配置したCo-Zr-Nb膜のFMR損失の算出—Calculation of FMR loss in Co-Zr-Nb film placed on transmission line using ladder-type magnetic circuit—マグネティックス研究会高周波磁気,マイクロ磁気,磁性材料一般,磁気応用一般

三上貴大, 室賀翔, 田中元志

電気学会研究会資料. MAG = The papers of technical meeting on magnetics, IEE Japan / マグネティックス研究会 [編]　2022/11
平行2線MSL上に配置したCo-Zr-Nb膜のクロストーク抑制効果および挿入損失の形状・導電率依存性—Geometries and resistivity dependencies on crosstalk suppression and insertion loss of Co-Zr-Nb film placed on parallel two MSLs—マグネティックス研究会高周波磁気,マイクロ磁気,磁性材料一般,磁気応用一般

室賀翔, 田中元志

電気学会研究会資料. MAG = The papers of technical meeting on magnetics, IEE Japan / マグネティックス研究会 [編]　2022/11
近傍磁界情報の機械学習を利用した平行2線MSL間の磁気結合係数の一推定—An estimation of magnetic coupling coefficient between parallel two MSLs using machine leaning of near field information—電磁環境研究会マイクロ波,電磁界シミュレーション,EMC一般

佐藤雄亮, 室賀翔, 鴨澤秀郁, 田中元志

電気学会研究会資料. EMC = The papers of technical meeting on electromagnetic compatibility, IEE Japan　2022/10
CNTを用いた電磁波吸収及び遮蔽材料の平板電磁界モデル化に関する一検討—A study on flat-plate electromagnetic field modeling of electromagnetic wave absorbing and shielding materials using CNTs—電磁環境研究会マイクロ波,電磁界シミュレーション,EMC一般

車田英次, 室賀翔, 田中元志, 上野智永, 柳伶旺, 日髙貴志夫, 伊藤彰, 嶋田修平, 粟野穰太, 川崎治

電気学会研究会資料. EMC = The papers of technical meeting on electromagnetic compatibility, IEE Japan　2022/10
Estimation of circuit parameters of MSL with Co-Zr-Nb film by magnetic circuit analysis

Mikami T., Muroga S., Tanaka M.

Transaction of the Magnetics Society of Japan Special Issues　2022/09/01

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Electrical equivalent circuit parameters of a microstrip line (MSL) with a Co-Zr-Nb film as a noise suppressor were estimated by magnetic circuit analysis. First, the magnetic flux distribution in the cross section of the MSL with Co-Zr-Nb film was theoretically calculated to determine the magnetic flux path of the magnetic circuit. Second, the circuit parameters were calculated by the magnetic circuit analysis and compared with the values obtained by S-parameter measurement. The results are in good agreement, which indicates the feasibility of the estimation of the electrical equivalent circuit parameters of the MSL with the noise suppressor using the magnetic circuit analysis with the cross-sectional dimensions and material properties.
Estimation of Conductive Noise Suppression in Microstrip Line with Two Different Magnetic Films

Takahiro Mikami, Sho Muroga, Motoshi Tanaka

Asia-Pacific Microwave Conference Proceedings, APMC　2022
Size Parameters Classification of Loop Current Model of PCB Traces by CNN of Magnetic Near-Field Distribution

Sho Muroga, Taichi Sasaki, Hidefumi Kamozawa, Yusuke Sato, Takahiro Mikami, Motoshi Tanaka

Asia-Pacific Microwave Conference Proceedings, APMC　2022
Evaluation of Transmission Characteristics of Differential and Common Modes of Parallel Two-Conductor Microstrip Lines with a Co-Zr-Nb Film

Masataka Masaki, Sho Muroga, Takahiro Mikami, Motoshi Tanaka

IEEJ Transactions on Fundamentals and Materials　2022
An Investigation on Insertion Loss Reduction of Crosstalk Suppressor Using Co-Zr-Nb Film

小林拓真, 室賀翔, 田中元志, 遠藤恭, 枦修一郎, 石山和志, 直江正幸

電気学会研究会資料. MAG = The papers of technical meeting on magnetics, IEE Japan / マグネティックス研究会 [編]　2021/12/16
Shielding and Absorption Mechanism of Electromagnetic Noise Suppressors in GHz Frequency Range

まぐね = Magnetics Japan　2021
Circuit parameter estimation of MSL with magnetic film using magnetic circuit analysis

三上貴大, 室賀翔, 田中元志

日本磁気学会学術講演概要集　2021
Investigation of Noise Suppression Mechanism Using Continuous Conductor Model of Metal-Coated Non-Woven Fabric

室賀翔, 田中元志, 岡村知恵, 日下部純一

電子情報通信学会技術研究報告(Web)　2021
Effect of Negative Permeability of Co-Zr-Nb Film on Crosstalk between Microstrip Lines

小林拓真, 室賀翔, 田中元志, 遠藤恭, 枦修一郎, 石山和志, 直江正幸

電子情報通信学会技術研究報告(Web)　2021
Estimation of inductive coupling between parallel MSLs by magnetic near field measurement

武井佑允, 室賀翔, 田中元志

電子情報通信学会技術研究報告(Web)　2021
Amplification of magnetization precession induced by the interference of spin waves

神田哲典, 室賀翔, 遠藤恭

電気学会研究会資料　2020/12/08
平面型の電磁ノイズ抑制体を配置した平行2導体マイクロストリップ線路の伝送特性の測定—Transmission Characteristics Measurement of Parallel Microstrip Lines with Noise Suppression Sheet—電磁環境研究会 EMC一般

正木信駿, 室賀翔, 田中元志

電気学会研究会資料. EMC = The papers of technical meeting on electromagnetic compatibility, IEE Japan　2020/11/27
Transmission Characteristics Measurement of Parallel Microstrip Lines with Noise Suppression Sheet

2020/11/27
A Study on EEG measured when Changing Color of OLED Lighting

Kanbayashi Miho, Toma Takahiro, Tanaka Motoshi, Muroga Sho, Katsutoshi Saito, Niiyama Yoshitsugu

Transactions of Japanese Society for Medical and Biological Engineering　2020

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<p>In order to investigate an evaluation method of lighting space by parameters of brain waves, EEG measurement and opinion test were done in a room with a color lighting. The color lighting with 64 Organic-LED panels was located in front of a subject, with a distance of 2.8 m and a height of 1 m. Color was changed such as red, green, etc. with interval of 90 s. The opinion test about "Comfortableness", "Feeling", etc. was done with five-grade scale. Thirteen subjects (21-23 ages) provided written informed consent.In the case when color changed from green to red, mean opinion score (MOS) of "Comfortableness" decreased, and a correspondence with fast-alpha-wave power component was observed. In some cases, the relationship with MOS and the component was not observed depending on the color change. However, these results indicate the feasibility of using of EEG information to evaluate the lighting space.</p>
Inductance estimation of MSL with magnetic film using magnetic circuit analysis

三上貴大, 室賀翔, 田中元志

日本磁気学会学術講演概要集　2020
Inductive Noise De-coupling Using Ferromagnetic Resonance of Magnetic Films for Next-generation Mobile Devices

室賀翔

村田学術振興財団年報　2020
Magnetization dynamics induced by slot line waveguide and detection of spin waves in yttrium iron garnet

神田哲典, 室賀翔, 遠藤恭

日本磁気学会学術講演概要集　2020
Co-Zr-Nb膜を配置した平行2線マイクロストリップ線路の伝送特性の測定

正木信駿, 室賀翔, 田中元志

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2020
Co-Zr-Nb膜を配置した平行2導体MSLのインダクタンスの推定

三上貴大, 室賀翔, 田中元志

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2020
Study on Plane Electromagnetic Wave Absorption Mechanism for Metal-Coated Non-Woven Fabric

2019/12/13
金属被覆した不織布の平面電磁波吸収機構に関する検討

佐野巧, 室賀翔, 田中元志, 倉林徹, 淀川信一, 岡村知恵, 日下部純一, 加藤一史

2019/12/13
有機ＥＬ照明の色を変えたときの主観評価と脳波解析

神林美帆, 遠間隆広, 田中元志, 室賀翔, 齊藤勝俊, 新山喜嗣

日本生体医工学会東北支部大会　2019/11/09

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ME-5-4
Characteristic Impedance of Coplanar Waveguide with Electromagnetic Noise Suppressor

2019/09/12
Magnetization dynamics in yttrium iron garnet single crystal thin films induced by slot line waveguides

神田哲典, 室賀翔, 遠藤恭

第80回応用物理学会秋季学術講演会　2019/09
誘導および伝送特性の同時測定によるマイクロストリップ線路のループ電流モデルの推定

武井佑允, 室賀翔, 田中元志

2019年度電気関係学会東北支部連合大会　2019/08/23
Effect of FMR Loss on Circuit Parameters of CPW with Co-Zr-Nb Film for Noise Suppression International-presentation

S. Muroga, M. Tanaka, Y. Endo

2019 Joint International Symposium on Electromagnetic Compatibility and Asia-Pacific International Symposium on Electromagnetic Compatibility, Sapporo　2019/07/24
寸法が異なる電磁ノイズ抑制体を配置したマイクロストリップ線路の回路定数の推定

三上貴大, 室賀翔, 田中元志

2019年度環境電磁工学研究会7月期研究会　2019/07/18
Influence of SRR Plane Placed above Microstrip Line on Transmission Characteristics

M. Tanaka, R.Sato, S.Muroga, Y. Kayano

2019 Joint International Symposium on Electromagnetic Compatibility and Asia-Pacific International Symposium on Electromagnetic Compatibility, Sapporo　2019/06/23
電磁ノイズ抑制のためのCo-Zr-Nb膜を配置したCPWの配線抵抗

室賀翔, 遠藤恭, 田中元志

2019年電子情報通信学会総合大会　2019/03
金属被覆した不織布の平面電磁波吸収特性

佐野巧, 室賀翔, 田中元志, 倉林徹, 淀川信一, 小尾留美名, 加藤一史

日本表面真空学会東北・北海道支部学術講演会講演予稿集　2019
Basic study on multilayer technique of nanogranular films for steady AC resistance at SHF band

直江正幸, 遠藤恭, 室賀翔

電気学会研究会資料. MAG = The papers of technical meeting on magnetics, IEE Japan　2018/11/27
コプレーナ線路に配置したCo‐Zr‐Nb膜の回路定数への影響

室賀翔, 遠藤恭, 田中元志

電気関係学会東北支部連合大会講演論文集(CD-ROM)　2018/09/06
Design of multi-disciplinary framework for improving generic skills and practical education in a depopulated mountainous area

Y. Omori, T. Ohata, K. Tanaka, Y. Sato, S. Muroga, K. Tsuzuki, Y. Ichikawa, Y. Mizuguchi

12th International Symposium on Advances in Technology Education (ISATE2018)　2018/09
イットリウム鉄ガーネットの磁化ダイナミクス励起における高周波伝送線路形状依存性の検討

神田哲典, 室賀翔, 遠藤恭

日本磁気学会学術講演概要集　2018/08/28
(CoPd-CaF₂)/(CaF₂)ナノグラニュラー積層膜のGHz帯高周波複素透磁率とノイズ抑制効果 (マグネティックスリニアドライブ合同研究会高周波磁気デバイス,高周波磁性材料,マイクロ電源,磁気センサ,リニアモータ・アクチュエータ,リニアドライブ技術一般,および磁気応用一般)

直江正幸, 遠藤恭, 宮崎孝道, 室賀翔, 馬静言, 枦修一郎, 石山和志

電気学会研究会資料. MAG = The papers of technical meeting on magnetics, IEE Japan　2018/08/22
(CoPd-CaF2)/(CaF2) Nanogranular Multilayers: Complex Permeability and Noise Suppression in GHz Region

直江正幸, 遠藤恭, 宮崎孝道, 室賀翔, MA Jingyan, 枦修一郎, 石山和志

電気学会研究会資料　2018/08/22
Mechanism and design of magnetic sheet-/film-type noise suppressor

Sho Muroga, Yasushi Endo, Motoshi Tanaka

Journal of Japan Institute of Electronics Packaging　2018
コプレーナ線路に配置したCo-Zr-Nb膜の回路定数への影響

室賀翔, 遠藤恭, 田中元志

電気関係学会東北支部連合大会講演論文集　2018
中山間地における交流活動への参加者小学生が家族へ与える影響に関する一考察

佐藤雄哉, 田中健作, 大森有希子, 室賀翔, 市川裕理, 都築啓太, 水口陽子, 大畑卓也

第28回日本都市計画学会中部支部研究発表会論文･報告集　2017/10
イットリウム鉄ガーネットの磁化ダイナミクスを利用した高感度磁気センシングの基礎検討

神田哲典, 室賀翔, 遠藤恭, 黒澤孝裕

日本磁気学会学術講演概要集　2017/09/05
T型等価回路を用いた磁性膜を集積化した伝送線路の基礎特性解析

高松将成, 室賀翔

電気・電子・情報関係学会東海支部連合大会講演論文集(CD-ROM)　2017/08/28
Magnetic circuit evaluation of conductive and near-field noise suppression using Co-Zr-Nb film

S. Muroga, Y. Endo

2017 IEEE International Magnetics Conference, INTERMAG 2017　2017/08/10
Magnetic Circuit Evaluation of Conductive and Near-Field Noise Suppression using Co-Zr-Nb Film International-presentation

Sho Muroga, Yasushi Endo

IEEE International Magnetic Conference 2017　2017/04/27
Performance of Flexible Noise Suppressor for IoT Devices Made Only of Meltblown Non-Woven Fabric

Masahiro Yamaguchi, Jiang Fu, Sho Muroga, Tomoya Tanaka, Chie Okamura, Lumina Obi, Kazufumi Kato

2017 ASIA-PACIFIC INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (APEMC)　2017
Shielding Effectiveness of Meltblown Non-Woven Thin Fabric type Noise Suppressor

2016/09/16
Shielding effectiveness of meltblown non-woven thin fabric type noise suppressor

Jiang Fu, Masahiro Yamaguchi, Sho Muroga, Tomoya Tanaka, Chie Okamura, Lumina Obi, Kazufumi Kato

電子情報通信学会環境電磁工学研究会　2016/09/16
磁性膜を配置した配線間クロストーク評価のための特性長解析

室賀翔, 駒井眞人, 高地俊貴

電気・電子・情報関係学会東海支部連合大会講演論文集(CD-ROM)　2016/09/01
磁性膜を用いた磁束の帯域通過フィルタの磁気回路解析

室賀翔, 高松将成, 大場湧斗

電気・電子・情報関係学会東海支部連合大会講演論文集(CD-ROM)　2016/09/01
伝送線路上に配置した磁性膜による電磁ノイズ抑制機構 Invited

室賀翔

電気・電子・情報関係学会東海支部連合大会講演論文集(CD-ROM)　2016/09/01
Development of meltblown non-woven fabric type non-magnetic noise suppressor

Jiang Fu, Masahiro Yamaguchi, Sho Muroga, Tomoya Tanaka, Chie Okamura, Lumina Obi, Kazufumi Kato

2016 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2016　2016/07/26
Shielding Effectiveness of Meltblown Non-Woven Fabric Type Non-Magnetic Noise Suppressor (Electromagnetic Compatibility)

2016/06/02
Shielding Effectiveness of Meltblown Non-Woven Fabric Type Non-Magnetic Noise Suppressor (The Papers of Joint Technical Meeting on Electromagnetic Compatibility and Magnetics, IEE Japan : EMC Joint Workshop, 2016, Taipei)

2016/06/02
Shielding Effectiveness of Meltblown Non-Woven Fabric Type Non-Magnetic Noise Suppressor International-presentation

Sho Muroga, Jiang Fu, Masahiro Yamaguchi, Tomoya Tanaka, Chie Okamura, Lumina Obi, Kazufumi Kato

EMC Joint Workshop 2016 Taipei, EMCJ/IEE-EMC/IEE-MAG　2016/06
磁性膜を用いた電磁ノイズ抑制体のノイズ抑制機構 Invited

室賀翔

IEEE EMC Society Sendai Chapter Colloquium　2016/02
Development of Meltblown Non-Woven Fabric Type Non-Magnetic Noise Suppressor

Jiang Fu, Masahiro Yamaguchi, Tomoya Tanaka, Chie Okamura, Lumina Obi, Kazufumi Kato, Sho Muroga

2016 ASIA-PACIFIC INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (APEMC)　2016

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This paper systematically discusses fabrication process, morphological observation and electromagnetic noise suppression performance of new series of the non-woven fabric type noise suppressor consisting only of the meltblown thin fibers. Effect of contact resistance has been clarified experimentally for the first time as the sheet resistance becomes the less and accordingly the loss ration becomes higher as the pressure during fabrication increases, and as the heat treatment is applied to weld the fibers. The noise suppression performance was as high as conventional thick-thin fiber type NSS.
Analysis of intra-chip degital noise coupling path in fully LTE compliant RF receiver test chip

Masahiro Yamaguchi, Peng Fan, Satoshi Tanaka, Sho Muroga, Makoto Nagata

IEEE International Symposium on Electromagnetic Compatibility　2015/09/10
On-Chip and On-Board RF Noise Coupling and Impacts on LTE Wireless Communication Performance International-presentation

M. Nagata, N. Miura, S. Muroga, S. Tanaka, M. Yamaguch

The 2015 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT2015)　2015/08
Analysis of intra-chip degital noise coupling path in fully LTE compliant RF receiver test chip International-presentation

M.Yamaguchi, S.Tanaka, Y.Endo, S. Muroga, M. Nagata

2015 IEEE International Symposium on Electromagnetic Compatibility (EMC)　2015/08
Radiated and conductive noise suppression of non-magnetic metal-coated non-woven fabric International-presentation

T.Tanaka, C. Okamura, S. Okajima, K. Kato, S. Muroga, Y. Asazuma, M. Yamaguchi

2015 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)　2015/06
On-chip integrated magnetic thin-film solution to countermeasure digital noise on RF IC International-presentation

M.Yamaguchi, S.Tanaka, Y.Endo, S. Muroga, M. Nagata

2015 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)　2015/06
Effects of On-Board Noise Remedy at IC Chip Level Noise Reduction : A Case Study in LTE-Class IC Chip

KOUSAKA Junpei, SHIMAZAKI Shunsuke, MIURA Noriyuki, MUROGA Sho, TANAKA Satoshi, YAMAGUCHI Masahiro, NAGATA Makoto

IEICE technical report. Electromagnetic compatibility　2015/03/06

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Digital circuits in a mobile communication IC Chip become more enormous for LTE class design. This potentially causes the undesigned noise coupling in the receiver circuit and leads to the deterioration of overall system communication quality. In this study, noise reduction techniques have been explored. A prototype chip having a digital noise generator, LTE-class wireless receiver circuit and on-chip voltage waveform monitor, EMI tester, and the system level simulator for measuring communication quality are prepared for this study. We measured and analyzed the effect of three terminal capacitor on the chip and board level noise coupling. As a result, it exhibits a noise reduction effect of 5dB at the system level in the 2GHz band used in LTE. This will improve communication quality.
非磁性金属を被覆した合成長繊維不織布の伝導ノイズ抑制効果

室賀翔, 浅妻裕己, 山口正洋, 田中智也, 岡村知恵, 岡嶋真一, 加藤一史

電気学会全国大会講演論文集(CD-ROM)　2015/03/05
Effects of On-Board Noise Remedy at IC Chip Level Noise Reduction : A Case Study in LTE-Class IC Chip

KOUSAKA Junpei, SHIMAZAKI Shunsuke, MIURA Noriyuki, MUROGA Sho, TANAKA Satoshi, YAMAGUCHI Masahiro, NAGATA Makoto

IEICE technical report. Electromagnetic compatibility　2015/02/27

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Digital circuits in a mobile communication IC Chip become more enormous for LTE class design. This potentially causes the undesigned noise coupling in the receiver circuit and leads to the deterioration of overall system communication quality. In this study, noise reduction techniques have been explored. A prototype chip having a digital noise generator, LTE-class wireless receiver circuit and on-chip voltage waveform monitor, EMI tester, and the system level simulator for measuring communication quality are prepared for this study. We measured and analyzed the effect of three terminal capacitor on the chip and board level noise coupling. As a result, it exhibits a noise reduction effect of 5dB at the system level in the 2GHz band used in LTE. This will improve communication quality.
On-chip Integrated Magnetic Thin-Film Solution to Countermeasure Digital Noise on RF IC

Masahiro Yamaguchi, Satoshi Tanaka, Yasushi Endo, Sho Muroga, Makoto Nagata

2015 ASIA-PACIFIC INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (APEMC)　2015

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Crossed anisotropy amorphous Co85Zr3Nb12 thin film with total magnetic thickness of 2.0 mu m is deposited on to the passivation of a test IC chip to accommodate intra IC chip level digital-to-RF noise suppression and telecommunication performance simultaneously. This technology is applicable to other frequency band in 0.41 to 3 GHz by using Co85(x+y)Zr3+xNb12+y (x: 0. 5.5, y: 0.-11.0) film. In-band spurious tone is attenuated by 10 dB and the minimum input power level to meet the 3GPP criteria is improved by 8 dB. Intra electromagnetic coupling analysis from digital to RF circuits within the bandwidth of wireless channels have clarified that the magnetic film suppressed conduction noise in on-chip wires.
Radiated and Conductive Noise Suppression of Non-magnetic Metal-coated Non-woven Fabric

Tomoya Tanaka, Chie Okamura, Shinichi Okajima, Kazufumi Kato, Sho Muroga, Yuki Asazuma, Masahiro Yamaguchi

2015 ASIA-PACIFIC INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (APEMC)　2015

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A new noise suppressor made from metal-coated non-woven fabrics is developed and studied by electromagnetic simulation and measurements. In the case of far fields, the shielding effectiveness to plane waves can be calculated using sheet resistance by regarding the non-woven fabric as a continuous metal sheet. Therefore, we show that the low wave impedance in the fine fiber layers generates a high shielding effectiveness. In the case of near fields, conductive noise suppression in a Microstrip line (MSL) with the non-woven fabric and with a continuous conductor is measured. Consequently, we clarify that there are some cases wherein the loss in the MSL while using the non-woven fabric is greater than that while using a continuous conductor in a specific frequency range. In this measurement, the loss from a noise suppression sheet (NSS) was 16% higher than that from a continuous film. From these results, we have successfully demonstrated the higher conductive noise suppression performance of the proposed thin, light, and flexible NSS.
Analysis of On-Chip Digital Noise Coupling Path for Wireless Communication IC Test Chip

Satoshi Tanaka, Peng Fan, Jingyan Ma, Hanae Aoki, Masahiro Yamaguchi, Makoto Nagata, Sho Muroga

2015 10th International Workshop on the Electromagnetic Compatibility of Integrated Circuits　2015

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In-band spurious tones of a LTE-class radio frequency integrated circuit (RFIC) receiver test element group (TEG) chip was studied in order to evaluate the degree of noise suppression by means of soft magnetic thin film. A 2-mu m-thick crossed anisotropy multilayered Co-Zr-Nb film was appllied onto the passivation layer of TEG chip. The in-band spurious was suppressed by 10 dB while it had no influence upon wanted signal. A magnetic near field map measured in the 2.1 GHz range indicated several noise coupling paths on chip, which were compared with the chip layout design to estimate victim wires. EM simulation model in connection with circuit simulation is carefully constructed. RF control wirings were most responsible wires than other wires and air couplings. EM simulation predicted the magnetic film should suppress noise by the maximum of 33 dB while it was 10 dB experimentally because of Si substrate coupling and board coupling.
Electromagnetic Field Simulation of Power Losses in Electromagnetic Noise Suppressor

山口正洋, 室賀翔

まぐね　2015
Analysis of on-chip digital noise coupling path for wireless communication IC test chip

Satoshi Tanaka, Peng Fan, Jingyan Ma, Hanae Aoki, Masahiro Yamaguchi, Makoto Nagata, Sho Muroga

2015 10th International Workshop on the Electromagnetic Compatibility of Integrated Circuits (EMC Compo)　2015
ICチップレベルの低ノイズ化高分解能RF電磁界プローブに関する研究

遠藤恭, 室賀翔, 荒井薫, 重田洋二郎, 山口正洋

電磁環境工学情報EMC　2014/10/05
Study on high resolution electromagnetic probe Invited

Yasushi Endo, Sho Muroga, Kaoru Arai, Yojiro Shigeta, Masahiro Yamaguchi

Solution Tchnology EMC　2014/10
高分解能RF電磁界プローブに関する研究 (特集 ICチップレベルの低ノイズ化)

遠藤恭, 室賀翔, 荒井薫

EMC : electro magnetic compatibility : solution technology : 電磁環境工学情報　2014/10
Analysis of Conductive and Inductive Noise Couplings on TEG Chip with Magnetic Thin Film

MUROGA Sho, FAN Peng, TANAKA Satoshi, KITAMRA Tomomitsu, MATSUI Hiroaki, AZUMA Naoya, SHIMAZAKI Shunsuke, KOSAKA Junpei, NAGATA Makoto, YAMAGUCHI Masahiro

IEICE technical report. Electromagnetic compatibility　2014/06/20

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The integrated simulation was constructed using the full wave 3-dimensional electromagnetic field simulator and the circuit analysis in order to analyze the mechanism of the on-chip conductive and the inductive noise coupling in LTE-class RFIC. From the constructed simulation, the main EM noise coupling on the chip revealed as the conductive and the inductive noise coupling. Furthermore, the noise suppression mechanism using the magnetic thin film was discussed.
Analysis of Conductive and Inductive Noise Couplings on TEG Chip with Magnetic Thin Film

MUROGA Sho, FAN Peng, TANAKA Satoshi, KITAMRA Tomomitsu, MATSUI Hiroaki, AZUMA Naoya, SHIMAZAKI Shunsuke, KOSAKA Junpei, NAGATA Makoto, YAMAGUCHI Masahiro

IEICE technical report. Electromagnetic compatibility　2014/06/13

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The integrated simulation was constructed using the full wave 3-dimensional electromagnetic field simulator and the circuit analysis in order to analyze the mechanism of the on-chip conductive and the inductive noise coupling in LTE-class RFIC. From the constructed simulation, the main EM noise coupling on the chip revealed as the conductive and the inductive noise coupling. Furthermore, the noise suppression mechanism using the magnetic thin film was discussed.
Conductive Noise Suppression in the MSL using the Metal-Coated Non-Woven Fabric with High Sheet Resistance

Muroga Sho, Asazuma Yuki, Yamaguchi Masahiro, Tanaka Tomoya, Okamura Chie, Okajima Shinichi, Kato Kazufumi

IEICE technical report. Electromagnetic compatibility　2014/03/14

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As a solution to on-board-level the electromagnetic compatibility problem, a metal-coated non-woven fabric with high sheet resistance is proposed. In this paper, we compared the conductive noise suppression in a microstripline (MSL), which was prepared with reference to the IEC62333-2, using the 80 x 80 mm sized non-woven fabric and 80 x 80 mm sized continuous conductors to clarify whether there is the difference and to clarify what the factor that makes the difference. As a result of this, we showed that there is the difference in the loss in the MSL when the direction of fibers of the nonwoven fabric is perpendicular and parallel to the direction of the signal line. In addition to this, we showed that the loss in the MSL using the non-woven fabric is 16% greater than the loss in the MSL using continuous conductors from 0.4 to 1.5 GHz.
Conductive Noise Suppression in the MSL using the Metal-Coated Non-Woven Fabric with High Sheet Resistance

Muroga Sho, Asazuma Yuki, Yamaguchi Masahiro, Tanaka Tomoya, Okamura Chie, Okajima Shinichi, Kato Kazufumi

IEICE technical report. Electromagnetic compatibility　2014/03/07

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As a solution to on-board-level the electromagnetic compatibility problem, a metal-coated non-woven fabric with high sheet resistance is proposed. In this paper, we compared the conductive noise suppression in a microstripline (MSL), which was prepared with reference to the IEC62333-2, using the 80 x 80 mm sized non-woven fabric and 80 x 80 mm sized continuous conductors to clarify whether there is the difference and to clarify what the factor that makes the difference. As a result of this, we showed that there is the difference in the loss in the MSL when the direction of fibers of the nonwoven fabric is perpendicular and parallel to the direction of the signal line. In addition to this, we showed that the loss in the MSL using the non-woven fabric is 16% greater than the loss in the MSL using continuous conductors from 0.4 to 1.5 GHz.
Analysis of Conductive and Inductive Noise Suppression by Multilayered Co-Zn-Nb Film Integrated on MSL

馬静言, 島田寛, 室賀翔, 遠藤恭, 山口正洋

Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2014
A 60 x 60 μm2 Size Planar Shielded Loop Probe for Low Lift-Off On-Chip Magnetic Near Field Measurements

Masahiro Yamaguchi, Sho Muroga, Shiori Nanba, Kaoru Arai, Kunio Yanagi, Yasushi Endo

EMC Europe 2013 Proceedings　2014
Measurements and Simulation of RF Noise Coupling and Its Impacts on LTE Wireless Communication Performance International-presentation Invited

M. Nagata, S. Shimazaki, N. Azuma, N. Miura, S. Muroga, Y. Endo, S. Tanaka, M. Yamaguchi

2014 International Symposium on Electromagnetic Compatibility, Tokyo　2014
On-Chip Magnetic Thin-Film Noise Suppressor for IC Chip Level Digital Noise Countermeasure International-presentation Invited

M. Yamaguchi, Y. Endo, S. Tanaka, T. Ito, S. Muroga, N. Azuma, M. Nagata

2014 International Symposium on Electromagnetic Compatibility, Tokyo　2014
Development of Micro Magnetic Field Probe to Evaluate Near Field on RFIC Chip International-presentation Invited

Y. Endo, M. Yamaguchi, Y. Shigeta, M. Onishi, K. Arai, S. Muroga

2014 International Symposium on Electromagnetic Compatibility, Tokyo　2014
Effect of Demagnetizing Field on Frequency Dispersion of Complex Permeability International-presentation

S. Muroga, M. Yamaguch

2014 International Symposium on Electromagnetic Compatibility, Tokyo　2014
Electromagnetic Shielding Effectiveness of Non-magnetic Metal Coated Non-woven Fabric Noise Suppressor International-presentation

Sho Muroga, Yuki Asazuma, Masahiro Yamaguchi, Tomoya Tanaka, Chie Okamura, Shin-ichi Okajima, Kazufumi Kato

IEEE International Symposium on Electromagnetic Compatibility, Raleigh　2014
GHz Range Magnetic Field Measurement of a Coplanar Waveguide with a Magnetic Force Microscope Tip by Exploiting a Beat Signal Between the Coplanar Waveguide and an Exciting Coil International-presentation

Yasushi Endo, Masaki Onishi, Sho Muroga, Kaoru Arai, Kunio Yanagi, Yutaka Shimada, Masahiro Yamaguchi

IEEE Intermag 2014　2014
Performance of Crossed Anisotropy Multilayered CoZrNb Films as IC Chip Level Electoromagnetic Noise Suppressor International-presentation

Yutaka Shimada, Jingyan Ma, Tetsuo Ito, Kunio Yanagi, Yasushi Endo, Sho Muroga, Masahiro Yamaguchi

IEEE Intermag 2014　2014
In-band spurious attenuation in LTE-class RFIC chip using a soft magnetic thin film International-presentation Invited

S. Muroga, Y. Endo, T. Ito, S. Tanaka, M. Murakami, K. Hori, S. Takahashi, A. Naoya, T. Makita, S. Imai, M. Nagata, M. Yamaguch

2013 IEEE International Symposium on Electromagnetic Compatibility　2013/12
Magnetic Materials and IC Chip Level EMC

YAMAGUCHI Masahiro, MUROGA Sho, ENDO Yasushi, NAGATA Makoto, TANAKA Satoshi

IEICE technical report. Electromagnetic compatibility　2013/10/24

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A technological challenge of LTE(Long Term Evolution) class RFIC is to solve desensitization of receiver circuit caused by the harmonics of clock signal of RF-digital circuits implemented in the in the same IC chip. This problem turns out to be noticeable as the degital assist technique for Si-CMOS circuit becomes popular. This paper explains a new technology to suppress electric current-driven noise on IC chip by utilizing ferromagnetic resonance losses of magnetic thin film in a popular LTE downlink frequency band of 2GHz range. The in-band spurius level was suppressed by 10dB while keeping the Throughput fraction higher than 95%.
Magnetic material and IC chip level EMC

YAMAGUCHI Masahiro, MUROGA Sho, ENDO Yasushi, NAGATA Makoto, TANAKA Satoshi

電子情報通信学会技術研究報告. EST, エレクトロニクスシミュレーション　2013/10/17

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A technological challenge of LTE(Long Term Evolution) class RFIC is to solve desensitization of receiver circuit caused by the harmonics of clock signal of RF-digital circuits implemented in the in the same IC chip. This problem turns out to be noticeable as the degital assist technique for Si-CMOS circuit becomes popular. This paper explains a new technology to suppress electric current-driven noise on IC chip by utilizing ferromagnetic resonance losses of magnetic thin film in a popular LTE downlink frequency band of 2GHz range. The in-band spurius level was suppressed by 10dB while keeping the Throughput fraction higher than 95%.
Magnetic material and IC chip level EMC

YAMAGUCHI Masahiro, MUROGA Sho, ENDO Yasushi, NAGATA Makoto, TANAKA Satoshi

IEICE technical report. Electromagnetic compatibility　2013/10/17

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A technological challenge of LTE(Long Term Evolution) class RFIC is to solve desensitization of receiver circuit caused by the harmonics of clock signal of RF-digital circuits implemented in the in the same IC chip. This problem turns out to be noticeable as the degital assist technique for Si-CMOS circuit becomes popular. This paper explains a new technology to suppress electric current-driven noise on IC chip by utilizing ferromagnetic resonance losses of magnetic thin film in a popular LTE downlink frequency band of 2GHz range. The in-band spurius level was suppressed by 10dB while keeping the Throughput fraction higher than 95%.
Magnetic material and IC chip level EMC

YAMAGUCHI Masahiro, MUROGA Sho, ENDO Yasushi, NAGATA Makoto, TANAKA Satoshi

IEICE technical report. Microwaves　2013/10/17

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A technological challenge of LTE(Long Term Evolution) class RFIC is to solve desensitization of receiver circuit caused by the harmonics of clock signal of RF-digital circuits implemented in the in the same IC chip. This problem turns out to be noticeable as the degital assist technique for Si-CMOS circuit becomes popular. This paper explains a new technology to suppress electric current-driven noise on IC chip by utilizing ferromagnetic resonance losses of magnetic thin film in a popular LTE downlink frequency band of 2GHz range. The in-band spurius level was suppressed by 10dB while keeping the Throughput fraction higher than 95%.
Influence of Sheet Resistance on Electric Field Attenuation using Metal Coated Non-woven Fabric

MUROGA Sho, ASAZUMA Yuki, TANAKA Tomoya, OKAMURA Chie, OKAJIMA Shinichi, KATO Kazufumi, YAMAGUCHI Masahiro

電気学会研究会資料. EMC, 電磁環境研究会　2013/06/21
Influence of Sheet Resistance on Electric Field Attenuation using Metal Coated Non-woven Fabric

YAMAGUCHI Masahiro, MUROGA Sho, ASAZUMA Yuki

電気学会研究会資料. EMC, 電磁環境研究会　2013/06/21
Influence of Sheet Resistance on Electric Field Attenuation using Metal Coated Non-woven Fabric(1)

Yamaguchi Masahiro, Muroga Sho, Asazuma Yuki

IEICE technical report. Electromagnetic compatibility　2013/06/14

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This paper describes that the ferromagnetic resonance (FMR) frequency shift can be calculated by an electromagnetic field simulator based on the Maxwell's equation although the relative permeability and the FMR frequency is defined by the Landau-Lifshitz-Gilbert (LLG) and the Kittel's equation. We evaluate the magnetic circuit model with the leakage magnetic flux path for considering the demagnetizing field generated in the magnetic film. As the result, we clarify that the effect of the demagnetizing field is considered as a reluctance of the leakage magnetic flux path in the magnetic circuit calculation, which is considered as the increase of anisotropy field in the Kittel's equation. Furthermore, we show that the simulated FMR frequency by the electromagnetic simulator agrees with the measured values.
Influence of Sheet Resistance on Electric Field Attenuation using Metal Coated Non-woven Fabric(2)

Muroga Sho, Asazuma Yuki, Tanaka Tomoya, Okamura Chie, Okajima Shinichi, Kato Kazushi, Yamaguchi Masahiro

IEICE technical report. Electromagnetic compatibility　2013/06/14

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The metal coated non-woven fabrics is proposed as a solution to on-board-level the electromagnetic compatibility problem. This paper discussed the shielding effectiveness and Joule loss of the metal coated non-woven fabric using an electrical circuit analysis and full wave electromagnetic field simulation. Shielding effectiveness of the non-woven fabric is essentially equivalent to that of the continuous film and can be estimated with sheet resistance defined as the quotient of thickness and resistivity of the non-woven fabrics. Oh the other hand, noise suppression in near field can be obtained with the circuit model using the capacitances of between non-woven fabrics.
Fabrication of power micro-inductor using CoFeSiB flat particles

SATO Hiroyuki, ENDO Yasushi, MUROGA Sho, YAMAGUCHI Masahiro, KATO Naoya

電気学会研究会資料. MAG, マグネティックス研究会　2013/06/13
Magnetic Shielding Effect of Nonwoven Fabric Coated with Aluminum

室賀翔, 遠藤恭, 伊藤哲夫

映像情報メディア学会技術報告 = ITE technical report　2013/03
Magnetic Shielding Effect of Nonwoven Fabric Coated with Aluminum

Muroga Sho, Endo Yasushi, Ito Tetsuo, Tanaka Satoshi, Murakami Motoki, Hori Kazuaki, Takahashi Satoru, Naoya Azuma, Nagata Makoto, Yamaguchi Masahiro

IEICE technical report. Electromagnetic compatibility　2013/03/01

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A long term evolution (LTE)-class CMOS radio frequency integrated circuit (RFIC) receiver test element group (TEG) chip is developed in our project for the next generation cell phone handsets in order to clarify the on-chip-level noise coupling and demonstrate the noise attenuation using the soft magnetic thin film as an on-chip electromagnetic noise suppressor. The TEG chip equips a noise generator and a RF receiver block. The RF block amplifies and demodulates transmitted signals to IQ signals. A Co_<85>Zr_3Nb_<12> soft magnetic thin film is integrated onto the TEG chip as a noise suppressor. In this report. the noise generator is driven by a clock signal of 1 24.803 MHz and generates 17th harmonics of 2,165MHz conflicts with the LTE band 1 (2,110-2,170MHz). As a result. the in-band digital noise was suppressed 5-20dB by the Co-Zr-Nb thin film as an integrated noise suppressor.
Measurements and simulation of substrate noise coupling in RF ICs with CMOS digital noise emulator

N. Azuma, S. Shimazaki, N. Miura, M. Nagata, T. Kitamura, S. Takahashi, M. Murakami, K. Hori, A. Nakamura, K. Tsukamoto, M. Iwanami, E. Hankui, S. Muroga, Y. Endo, S. Tanaka, M. Yamaguchi

EMC COMPO 2013 Proceedings - 9th International Workshop on Electromagnetic Compatibility of Integrated Circuits　2013
Measurements and simulation of substrate noise coupling in RF ICs with CMOS digital noise emulator.

Naoya Azuma, Shunsuke Shimazaki, Noriyuki Miura, Makoto Nagata, Tomomitsu Kitamura, Satoru Takahashi, Motoki Murakami, Kazuaki Hori, Atsushi Nakamura, Kenta Tsukamoto, Mizuki Iwanami, Eiji Hankui, Sho Muroga, Yasushi Endo, Satoshi Tanaka, Masahiro Yamaguchi

2013 9TH INTERNATIONAL WORKSHOP ON ELECTROMAGNETIC COMPATIBILITY OF INTEGRATED CIRCUITS (EMC COMPO 2013)　2013

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Substrate noise coupling in RE receiver front end circuitry for LTE wireless communication was examined by full-chip level simulation and on-chip measurements, with a demonstrator built in a 65 nm CMOS technology. A complete simulation how of full-chip level substrate noise coupling uses a decoupled modeling approach, where substrate noise waveforms drawn with a unified package-chip model of noise source circuits are given to mixed-level simulation of RF chains as noise sensitive circuits. The distribution of substrate noise in a chip and the attenuation with distance are simulated and compare with the measurements. The interference of substrate noise at the 17th harmonics of 124.8 MHz - the operating frequency of the CMOS noise emulator creates spurious tones in the communication bandwidth at 2.1 GHz.
In-band spurious attenuation in LTE-class RFIC chip using a soft magnetic thin film.

Sho Muroga, Y. Shimada, Yasushi Endo, Satoshi Tanaka, Masahiro Yamaguchi, Naoya Azuma, Makoto Nagata, Motoki Murakami, Kazuaki Hori, Satoru Takahashi

2013 9TH INTERNATIONAL WORKSHOP ON ELECTROMAGNETIC COMPATIBILITY OF INTEGRATED CIRCUITS (EMC COMPO 2013)　2013

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A long term evolution (LTE)-class CMOS radio frequency integrated circuit (RFIC) receiver test element group (TEG) chip is developed in our project for the next generation cell phone handsets in order to clarify the on-chip-level noise coupling and demonstrate the noise attenuation using the soft magnetic thin film as an on-chip electromagnetic noise suppressor. The TEG chip equips a noise generator and a RF receiver block. The RF block amplifies and demodulates transmitted signals to IQ signals. A Co85Zr3Nb12 soft magnetic thin film is integrated onto the TEG chip as a noise suppressor. In this report, the noise generator is driven by a clock signal of 124.803 MHz and generates 17th harmonics of 2,165 MHz conflicts with the LTE band 1 (2,110 - 2,170 MHz). As a result, the in-band digital noise was suppressed 5-20 dB by the Co-Zr-Nb thin film as an integrated noise suppressor.
In-Band Spurious Attenuation in LTE-Class RFIC Chip using a Soft Magnetic Thin Film

Sho Muroga, Yasushi Endo, Tetsuo Ito, Satoshi Tanaka, Motoki Murakami, Kazuaki Hori, Satoru Takahashi, Azuma Naoya, Tetsuya Makita, Satoshi Imai, Makoto Nagata, Masahiro Yamaguchi

2013 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (EMC)　2013

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A long term evolution (LTE)-class CMOS radio frequency integrated circuit (RFIC) receiver test element group (TEG) chip is developed in our project for the next generation cell phone handsets in order to clarify the on-chip-level noise coupling and demonstrate the noise attenuation using the soft magnetic thin film as an on-chip electromagnetic noise suppressor. The TEG chip equips a noise generator and a RF receiver block. The RF block amplifies and demodulates transmitted signals to IQ signals. A Co85Zr3Nb12 soft magnetic thin film is integrated onto the TEG chip as a noise suppressor.In this report, the noise generator is driven by a clock signal of 124.803 MHz and generates 17th harmonics of 2,165 MHz conflicts with the LTE band 1 (2,110 - 2,170 MHz). As a result, the in-band digital noise was suppressed 5-20 dB by the Co-Zr-Nb thin film as an integrated noise suppressor.
Frequency Dependence of Conductive and Inductive Noise Suppression of Magnetic Thin Film on Microstrip Line

平野紀, 遠藤恭, 伊藤哲夫, 柳邦雄, 室賀翔, 島田寛, 山口正洋

Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2013
In-Band Spurious Attenuation in LTE-Class RFIC Chip using a Soft Magnetic Film

S. Muroga, Y. Endo, T. Ito, S. Tanaka, M. Murakami, K. Hori, S. Takahashi, A. Naoya, T. Makita, S. Imai, M. Nagata, M. Yamaguchi

第3回 IEEE EMCシンポジューム2013（Denver）報告会　2013
In-band spurious attenuation in LTE-class RFIC chip using a soft magnetic thin film International-presentation Invited

Sho Muroga, Yasushi Endo, Tetsuo Ito, Satoshi Tanaka, Motoki Murakami, Kazuaki Hori, Satoru Takahashi, Azuma Naoya, Tetsuya Makita, Satoshi Imai, Makoto Nagata, Masahiro Yamaguchi

IEEE International workshop on Electromagnetic Compatibility of Integrated Circuits (EMC Compo 2013)　2013
LTE級RFICにおける新しい帯域内スプリアス抑制法の提案〜バックエンドプロセスによる磁性薄膜集積化〜

室賀翔, 遠藤恭, 伊藤哲夫, 田中聡, 村上元己, 堀和明, 高橋覚, 東直矢, 永田真, 山口正洋

電子情報通信学会環境電磁工学研究会　2013
LTE In-Band Noise Suppression by Magnetic Thin Film Integrated on TEG Chip

Muroga Sho, Nagata Makoto, Yamaguchi Masahiro, Fan Peng, Endo Yasushi, Ito Tetsuo, Murakami Motoki, Hori Kazuaki, Takahashi Satoshi, Tanaka Satoshi, Azuma Naoya

Proceedings of JIEP Annual Meeting　2013

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無線機器内のＲＦ部における高速信号伝送の品質の向上を目的として，LTE(Long Term Evolution)級RFトランシーバを想定したTEG(Test Element Group)チップ上に磁性膜を集積化し，LTE信号帯域へ混入する高周波ノイズ抑制効果を示した．高周波ノイズに関しては，TEGチップ内に設計した任意雑音発生回路を用いて，デジタル回路のスイッチングにより生じるノイズを発生した．その結果，磁性膜の集積化により，約10dBのLTE帯域内ノイズ抑制効果が得られた．
Development of 3-D Magnetic Near Field Scanner for IC Chip-Level Noise Coupling Evaluation

Shigeta Yojiro, Muroga Sho, Arai Kaoru, Dhungana Sandeep, Okuta Ryosuke, Endo Yasuhsi, Yamaguchi Masahiro

Proceedings of JIEP Annual Meeting　2013

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ICチップレベルのノイズ結合評価を目的とした3D近傍磁界計測装置および60μm角のオンチップシールディドループコイルを搭載したプローブを開発した．本計測装置を用いて試作ICチップを評価し，ICチップレベルのノイズ評価に対する装置の有用性を示した．更に，1 μm厚のCoZrNb膜を集積化したTEGチップの近傍磁界計測により，最大で15 dBの近傍磁界抑制効果が得られた．
金属加工した合成長繊維不織布による磁気シールド効果

浅妻裕己, 室賀翔, 田中智也, 岡村知恵, 岡嶋真一, 加藤一史, 山口正洋

第27回エレクトロニクス実装学会春季講演大会　2013
Effect of Line Impedance to Conductive Noise Suppression by Magnetic Film Integrated on Parallel Line

Kuraishi Kiyoto, Muroga Sho, Asazuma Yuki, Yamahuchi Masahiro

Proceedings of JIEP Annual Meeting　2013

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本研究では，磁性薄膜を用いた電磁ノイズ抑制体の伝導ノイズ抑制メカニズムを明らかにするため，伝導ノイズの伝播経路として，電源線を模擬した平行2線を仮定し，線路の特性インピーダンスおよび終端抵抗を変化させた際の伝導ノイズ抑制量の変化を明らかにした．
金属被覆された不織布によるシールド効果のシート抵抗依存性

室賀翔, 浅妻裕己, 田中智也, 岡村知恵, 岡嶋真一, 加藤一史, 山口正洋

電気学会全国大会　2013
電磁界シミュレーションにおける反磁界による強磁性共鳴周波数シフト

室賀翔, 浅妻裕己, 山口正洋

平成25年電気学会全国大会講演論文集　2013
伝送線路上に配置した磁性薄膜による伝導及び誘導ノイズ抑制効果

平野紀, 遠藤恭, 伊藤哲夫, 柳邦雄, 室賀翔, 島田寛, 山口正洋

第37回日本磁気学会学術講演会　2013
Beating field方式高周波磁気力顕微鏡探針励磁用コイルの試作とその高周波特性に関する研究

荒井薫, 遠藤恭, 島田寛, 柳邦雄, 室賀翔, 山口正洋

平成25年電気学会基礎・材料・共通部門　2013
高周波伝送線路上に配置したCoZrNb直交磁化膜による伝導ノイズおよび誘導ノイズ抑制効果

伊藤哲夫, 遠藤恭, 室賀翔, 平野紀, 柳邦雄, 島田寛, 山口正洋

平成25年電気学会基礎・材料・共通部門　2013
ICチップレベルのノイズ計測を目的としたオンチップ集積化アクティブ磁界プローブの開発

重田洋二郎, 佐藤徳之, 荒井薫, 室賀翔, 山口正洋

第37回日本磁気学会学術講演会　2013
CoFeSiB扁平微粒子を塗布したマイクロインダクタの電気特性評価

佐藤寛之, 遠藤恭, 室賀翔, 山口正洋, 鎌田博, 高橋正仁, 坂元真彦, 米田茂, 加藤直也

第37回日本磁気学会学術講演会　2013
RFICへの磁性薄膜集積化による帯域内スプリアス抑制

室賀翔, 樊鵬, 遠藤恭, 伊藤哲夫, 田中聡, 村上元己, 堀和明, 高橋覚, 東直矢, 永田真, 山口正洋

平成25年度スピニクス特別研究会　2013
磁性体とICチップレべルEMC

山口正洋, 室賀翔, 遠藤恭, 永田真, 田中聡

電子情報通信学会環境電磁工学研究会　2013
Study on In-Band Spurious Suppression using Magnetic Thin Film Integrated onto RFIC International-presentation

Peng Fan, Sho Muroga, Yasushi Endo, Tetsuo Ito, Satoshi Tanaka, Motoki Murakami, Kazuaki Hori, Satoru Takahashi, Naoya Azuma, Makoto Nagata, Masahiro Yamaguchi

2013 Japan-China-Korea International Workshop　2013
磁性体によるICチップレベルEMC技術

山口正洋, 室賀翔, 遠藤恭, 永田真, 田中聡

2013 第5回IEEE CPMT Society Japan Chapter イブニングミーティング　2013
Co-Zr-Nb薄膜の電磁ノイズ抑制機能の評価

島田寛, 馬静言, 伊藤哲夫, 柳邦雄, 遠藤恭, 室賀翔, 山口正洋

電気学会全国大会　2013
3-D Magnetic-Near-Field Scanner for IC Chip-Level Noise Coupling Measurements International-presentation Invited

Sho Muroga, Kaoru Arai, Dhungana Sandeep, Okuta Ryosuke, Yasushi Endo, Masahiro Yamaguchi

IEEE Intermag 2013　2013
Study of FMR Frequency Shift Through Electromagnetic Simulation and Its Application to Analyze Integrated Ferromagnetic Noise Suppressor International-presentation Invited

Sho Muroga, Yuki Asazuma, Masahiro Yamaguchi

IEEE Intermag 2013　2013
Study on magnetic thin films for electromagnetic noise suppression in LTE class IC chips International-presentation Invited

Yasushi Endo, Sho Muroga, Yutaka Shimada, Masahiro Yamaguchi

Abstract of 12th IUMRS International Conference on Advanced Materials, Part C　2013
A 60 x 60 μm2 Size Planar Shielded Loop Probe for Low Lift-Off On-Chip Magnetic Near Field Measurements International-presentation Invited

Masahiro Yamaguchi, Sho Muroga, Shiori Nanba, Kaoru Arai, Kunio Yanagi, Yasushi Endo

EMC Europe 2013 Proceedings　2013
Electromagnetic Shielding Effectiveness by Metal Coated Non-woven Fabric

Asazuma Yuki, Muroga Sho, Tanaka Tomoya, Okamura Chie, Okajima Shinichi, Kato Kazufumi, Yamaguchi Masahiro

Proceedings of JIEP Annual Meeting　2013

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モバイルIT機器における基板レベルのEMC問題を解決する手段の1つとして，布帛や不織布に金属加工したシールドシートが提案されている．本研究では，平面電磁波をシールドシート表面に対して垂直入射させた際の遠方界の磁界シールド効果について，有限要素法(FEM)に基づいた3次元電磁界解析および解析計算し，シールド効果の主要因であるシート抵抗および繊維間隔依存性を明らかにした．
FMR Frequency Shift of Magnetic Thin Film Noise Suppressor through Electromagnetic Simulation

MUROGA Sho, ASAZUMA Yuki, YAMAGUCHI Masahiro

電気学会研究会資料. MAG, マグネティックス研究会　2012/12/20
Three-dimensional microcoil oscillator fabricated with monolithic process on LSI

Tomotaka Yabe, Yasuhiro Mimura, Hirokazu Takahashi, Atsushi Onoe, Sho Muroga, Masahiro Yamaguchi, Takahito Ono, Masayoshi Esashi

ELECTRONICS AND COMMUNICATIONS IN JAPAN　2012/11

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Integration of three-dimensional microcoils on high-performance RF-LSI is one of the key technologies to realize future wireless telecommunication services and hypersensitive capacitance sensor systems. We designed and fabricated monolithic three-dimensional microcoils on an LSI substrate. The microcoil has long legs, which will minimize electromagnetic coupling to the LSI substrate. We succeeded in confirming the basic operation of the integrated oscillator circuit in the gigahertz frequency range. It was confirmed that process damage due to plasma ashing, heating at 200 degrees C, and sputter etching were not observed in the oscillation performance. (C) 2012 Wiley Periodicals, Inc. Electron Comm Jpn, 95(11): 4956, 2012; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/ecj.11404
Performance of Inter Decoupling by Magnetic Thin Film Noise Suppressor Integrated to LSI Chip

MUROGA Sho, KODATE Wataru, ENDO Yasushi, YAMAGUCHI Masahiro

IEICE technical report. Electromagnetic compatibility　2012/04/13

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New measurement method for L-coupling on the basis of the IEC standard to evaluate the sheet type ferromagnetic noise suppressor is proposed. Performance of magnetic thin-film is evaluated as a candidate for on-chip noise suppressor. Miniature loops coils implemented on a 90 nm design test element group (TEG) chip are used as the noise transmitter and receiver. Differential transmission parameter S_<dd21> is evaluated as a measure of inductive noise intra-decoupling. Magnetic film is useful for frequency selective noise decoupler. The coupling is supported most at the ferromagnetic resonance (FMR) frequency, which is deviated from its intrinsic frequency and the degree of deviation can be calculated by using characteristic length. These results demonstrate that the proposed method is useful to characterize the IC chip level noise suppressor in the GHz range.
IC チップに集積化した磁性薄膜電磁ノイズ抑制体のシールド効果

室賀翔, 遠藤恭, 小舘航, 佐々木義明, 吉川薫平, 佐々木悠太, 永田真, 山口正洋

日本磁気学会学術講演会　2012
伝送線路上の磁性薄膜によるシールド効果の磁気回路網解析

室賀翔, 浅妻裕己, 遠藤恭, 島田寛, 山口正洋

平成24年電気学会全国大会　2012
伝送線路上に集積化した磁性薄膜電磁ノイズ抑制体における特性長の導出

浅妻裕己, 室賀翔, 遠藤恭, 島田寛, 山口正洋

平成24年電気学会全国大会　2012
LSIチップ上に集積化した磁性薄膜電磁ノイズ抑制体のイントラデカップリング効果

室賀翔, 小舘渉, 遠藤恭, 山口正洋

電気学会環境電磁工学研究会 (EMCJ)　2012
磁性薄膜を用いたノイズ抑制技術 Invited

山口正洋, 室賀翔

東北受信環境クリーン協議会　2011/02/17
Calculation of Eddy Current Losses in a Miniature Disk and Its Application to the Thin Film Noise Suppressor

MUROGA Sho, SHIMADA Yutaka, YAMAGUCHI Masahiro

The transactions of the Institute of Electronics, Information and Communication Engineers. C　2011/02/01

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薄膜電磁ノイズ抑制体への鎖交磁束により発生する渦電流のシート抵抗に対する変化を定量的に検討するため,円盤の膜面垂直方向に磁界を印加したモデルにおける渦電流損の計算を行った.微小円盤における渦電流損は,円盤への鎖交磁束を得ることができれば,これを電磁誘導の法則に当てはめ,円盤内の渦電流を導出することにより,解析的に計算できることを示した.この微小円盤を,薄膜電磁ノイズ抑制体の膜長及び膜幅方向に多数並べたモデルを検討した.薄膜内の渦電流の経路は,微小円盤を適用したモデルにおいて,各微小円盤内で発生する渦電流を重ね合わせることにより説明することができることを示した.以上により,微小円盤モデルが薄膜電磁ノイズ抑制体の渦電流解析に極めて有用であることを明らかにした.
IC チップに集積化した磁性薄膜電磁ノイズ抑制体のシールド効果

室賀翔, 遠藤恭, 小舘航, 佐々木義明, 吉川薫平, 佐々木悠太, 永田真, 山口正洋

第35回日本磁気学会学術講演会　2011
磁性膜によるRFノイズ抑制効果の極大周波数

室賀翔, 遠藤恭, 三束芳央, 島田寛, 山口正洋

平成23年電気学会基礎・材料・共通部門大会　2011
ICチップ上の磁性膜によるシールド効果の膜厚・透磁率依存性

室賀翔, 遠藤恭, 小舘航, 佐々木義明, 吉川薫平, 佐々木悠太, 永田真, 山口正洋

平成23年スピニクス特別研究会　2011
Evaluation of Thin Film Noise Suppressor Applied to Noise Emulator Chip Implemented in 65nm CMOS Technology International-presentation

Sho Muroga, Yasushi Endo, Wataru Kodate, Yoshiaki Sasaki, Kumpei Yoshikawa, Yuta Sasaki, Makoto Nagata, Masahiro Yamaguchi

IEEE International Magnetics Conference 2011 (INTERMAG2011)　2011
Performance of Integrated Magnetic Thin Film Noise Suppressor Applied to CMOS Noise Test Chips International-presentation Invited

Masahiro Yamaguchi, Sho Muroga, Yasushi Endo, Wataru Kodate, Kumpei Yoshikawa, Yuta Sasaki, Makoto Nagata

the 41st European Microwave Conference　2011
Control of Loss Peak Frequency in On-Chip Ferromagnetic Noise Suppressor by Demagnetizing Field

MUROGA Sho, ENDO Yasushi, MITSUZUKA Yoshio, SHIMADA Yutaka, YAMAGUCHI Masahiro

電気学会研究会資料. MAG, マグネティックス研究会　2010/08/02
電磁界解析と透磁率解析を連成させたDC-DCコンバータ用パワーインダクタの磁気特性モデリング

ロエン, 室賀翔, 山口正洋, 茶谷健一

電気学会マグネティックス研究会　2010
薄膜電磁ノイズ抑制体の損失極大周波数に対する反磁界の影響,

室賀翔, 遠藤恭, 三束芳央, 島田寛, 山口正洋

第34回日本磁気学会学術講演会　2010
Mechanism of Ferromagnetic Noise Suppressor for Chip Level EMI Countermeasure International-presentation

Sho Muroga, Yasushi Endo, Yutaka Shimada, Masahiro Yamaguchi

2010 7th Workshop of Tohoku University, University of Electronic Science and Technology of China and Yeungnam University　2010
Ferromagnetic Thin Film Noise Suppressor Integrated to On-Chip Transmission Lines International-presentation

Masahiro Yamaguchi, Sho Muroga, Yasushi Endo, Mitsuru Suzuki, Takayoshi Inagaki, Yoshio Mitsuzuka

11th Joint MMM-Intermag Conference　2010
Estimation of Peak Frequency of Loss in Noise Suppressor Using Demagnetizing Factor International-presentation

Sho Muroga, Yasushi Endo, Yoshio Mitsuzuka, Yutaka Shimada, Masahiro Yamaguchi

The 2010 International Conference on Microwave Magnetics 2010 (ICMM2010)　2010
Application of Soft Magnetic Thin Film to Suppress EM noise in RFIC Chip for Cell Phone Handset International-presentation Invited

Masahiro Yamaguchi, Sho Muroga, Yasushi Endo, Yutaka Shimada

The 2010 International Conference on Microwave Magnetics (ICMM 2010)　2010
Modeling of magnetic characteristics of a power inductor for DC-DC converter application by means of coupling electromagnetic analysis and permeability analysis

LU Yan, MUROGA Sho, YAMAGUCHI Masahiro, CHATANI Kenichi

電気学会研究会資料. MAG, マグネティックス研究会　2009/09/25
Evaluation of Ferromagnetic Thin Film RF Noise Suppressor applied to On-Chip Transmission Lines for the Purpose of Noise Suppression in Semiconductor Devices

Muroga Sho, Endo Yasushi, Suzuki Mitsuru, Inagaki Takayoshi, Mitsuzuka Yoshio, Yamaguchi Masahiro

IEICE technical report. Electromagnetic compatibility　2009/08/28

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The noise suppression on the transmission line, fabricated in a 0.15μm five metals SOI-CMOS technology with high resistivity substrate, has been demonstrated using the CoZrNb soft magnetic film. The power loss of 37% was obtained at the frequency of 7GHz in coplanar line with film and 17% was obtained at the frequency of 5.4GHz in microstrip line with film. As a result, a large loss was obtained by short length of the transmission line.
薄膜電磁ノイズ抑制体のジュール損失発生機構に関する研究

室賀翔, 山口正洋

東北大学電気通信研究所工学研究科，EMC仙台ゼミナール　2009
Design of Planar Power Inductor for DC-DC converter used in mobile IT devices

Yan Lu, Sho Muroga, Masahiro Yamaguchi

平成21年度電気関係学会東北支部連合大会　2009
2.5 mm角チップ上に集積化した磁性薄膜電磁ノイズ抑制体の評価

室賀翔, 遠藤恭, 鈴木充, 稲垣孝嘉, 三束芳央, 山口正洋

平成21年度電気関係学会東北支部連合大会　2009
半導体素子レベル低ノイズ化を目的としたオンチップ伝送線路における磁性薄膜電磁ノイズ抑制体の基礎特性評価

室賀翔, 遠藤恭, 鈴木充, 稲垣孝嘉, 三束芳央, 山口正洋

電子情報通信学会環境電磁工学研究会　2009
オンチップ伝送線路上の磁性薄膜によるGHz帯のノイズ抑制効果

室賀翔, 遠藤恭, 鈴木充, 稲垣孝嘉, 三束芳央, 山口正洋

平成21年度スピニクス特別研究会　2009
Application of Magnetic Thin Film Noise suppressor to SOI-CMOS On-Chip Transmission Lines International-presentation

Sho Muroga, Yasushi Endo, Mitsuru Suzuki, Takayoshi Inagaki, Yoshio Mitsuzuka, Masahiro Yamaguchi

The 3rd Student Organizing International Mini-Conference on Information Electronics Systems　2009
RF Joule Losses Analysis in Thin Film Noise Suppressor Estimated by 3-D Equivalent Circuit Network International-presentation

Sho Muroga, Masahiro Yamaguchi

IEEE International Magnetics Conference 2009 (INTERMAG2009)　2009
Evaluation of Ferromagnetic Thin Film Noise Suppressor Applied to On-Chip Transmission Lines International-presentation

Sho Muroga, Yasushi Endo, Mitsuru Suzuki, Takayoshi Inagaki, Yoshio Mitsuzuka, Masahiro Yamaguchi

2009 International Conference on Solid State Devices and Materials (SSDM2009)　2009
Calculation of Eddy Current Losses in a Thin Film Noise Suppressor Taking Account of Cross-Sectional and In-Plane Eddy Currents

MUROGA Sho, YAMAGUCHI Masahiro

電気学会研究会資料. MAG, マグネティックス研究会　2008/12/18
Analysis Calculation of Eddy Current Losses In A Miniature Disk And Discussion About Its Application To A Thin-Film Noise Suppressor

MUROGA Sho, SHIMADA Yutaka, YAMAGUCHI Masahiro

電気学会研究会資料. MAG, マグネティックス研究会　2008/07/31
膜円盤モデルにおける渦電流損失解析とその電磁ノイズ抑制体への適用方法に関する考察

室賀翔, 島田寛, 山口正洋

電気学会マグネティックス研究会　2008
微小円盤の渦電流損失計算とその電磁ノイズ抑制体への適用

室賀翔, 島田寛, 山口正洋

第32回日本磁気学会学術講演会　2008
Design of Planar Power Inductor for mobile IT devices International-presentation

Yan Lu, Sho Muroga, Masahiro Yamaguchi

2008 China-Korea-Japan Graduates Workshop on Electronic Information (GWEI’08)　2008
Consideration on Physical Mechanism of The Optimum Sheet Resistance for Thin-Film Electromagnetic Noise Suppressor

MARUTA Kaori, MUROGA Sho, YAMAGUCHI Masahiro

電気学会研究会資料. MAG, マグネティックス研究会　2007/07/12
Frequency Characteristics of the Eddy Current Losses in a Noise Suppression Film calculated using a Disk Model

MUROGA Sho, MARUTA Kaori, SHIMADA Yutaka, YAMAGUCHI Masahiro

IEICE technical report. Electromagnetic compatibility　2007/06/15

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We have clarified through experiments and three-dimensional (3-D) finite-element method (FEM) electromagnetic field simulation that there is an optimum sheet resistance that maximize the loss in thin-film RF noise suppression films. In this paper the mechanism of optimum sheet resistance was analyzed based on analytical calculation, as well as 3-D FEM simulation as the reference. A disk model Was employed so that the eddy current losses generated by signal-line current and hence the flux linkage perpendicularly to the film plane can be analyzed. Eddy current losses and the optimum sheet resistance which maximize high harmonic losses in the disk model were qualitatively agreed between the two calculations.
B-4-88 Eddy Current Loss Analysis of Thin-Film RF Integrated Noise Suppressor

Muroga Sho, Maruta Kaori, Yamaguchi Masahiro

Proceedings of the IEICE General Conference　2007/03/07
薄膜集積型RFノイズ抑制体における渦電流損失解析

室賀翔, 丸田佳織, 山口正洋

電子情報通信学会総合大会　2007
薄膜ノイズ抑制体を模擬した円盤モデルにおける渦電流損失の周波数特性

室賀翔, 丸田佳織, 島田寛, 山口正洋

電子情報通信学会環境電磁工学研究会　2007
電磁ノイズ抑制体を模擬した円盤モデルにおける渦電流損失計算

室賀翔, 丸田佳織, 島田寛, 山口正洋

日本応用磁気学会学術講演会　2007
電磁ノイズ抑制体を模擬した円盤モデルにおける渦電流損失の解析計算

室賀翔, 丸田佳織, 島田寛, 山口正洋

平成19年度スピニクス特別研究会　2007
Control of ferromagnetic resonance loss of RF noise suppressors using magnetic thin films for transmission lines International-presentation

Kaori Maruta, Sho Muroga, Masahiro Yamaguchi, Ki Hyeon Kim

5th International Workshop on High Frequency Micromagnetic Devices and Materials (MMDM5)　2007
Discussion for Effective Use of Integrated Thin Film Type RF Noise Suppressors

MARUTA Kaori, MUROGA Syo, SHIMADA Yutaka, YAMAGUCHI Masahiro

IEICE technical report. Electromagnetic compatibility　2006/10/19

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This paper discusses about frequency and size dependence on the optimum sheet resistance of RF noise suppression films, which maximize high harmonic losses in transmission lines, using three-dimensional (3-D) finite-element method (FEM) electromagnetic field simulation. In the simulation model, noise suppression films with sheet resistance of 10^0〜10^6Ω/square were put on top of a microstrip-line. Based on simulated results of eddy currents in the film, mechanism of optimum sheet resistance was analyzed. At 0.5, 2,5 and 10GHz, simulated maximum power losses of the microstrip-line were 0.06 with sheet resistance of 2000Ω/square, 0.19 with sheet resistance of 1000Ω/square, 0.34 with sheet resistance of 400Ω/square and 0.49 with sheet resistance of 200Ω/square. With increasing of the film length, the optimum sheet resistance is fixed and power losses increase proportional to the length. With increasing of the film width, the optimum sheet resistance shift to lower value and power losses increase. With increasing of the film thickness, both the optimum sheet resistance and power losses are almost same for all thicknesses. Designing a magnetic film based on optimum sheet resistance and ferromagnetic resonance, the simulated power loss reached 0.53, which was increased by 63% compared with nonmagnetic film.
Discussion for Effective Use of Integrated Thin Film Type RF Noise Suppressors

MARUTA Kaori, MUROGA Syo, SHIMADA Yutaka, YAMAGUCHI Masahiro

IEICE technical report. Microwaves　2006/10/19

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This paper discusses about frequency and size dependence on the optimum sheet resistance of RF noise suppression films, which maximize high harmonic losses in transmission lines, using three-dimensional (3-D) finite-element method (FEM) electromagnetic field simulation. In the simulation model, noise suppression films with sheet resistance of 10^0〜10^6Ω/square were put on top of a microstrip-line. Based on simulated results of eddy currents in the film, mechanism of optimum sheet resistance was analyzed. At 0.5, 2,5 and 10GHz, simulated maximum power losses of the microstrip-line were 0.06 with sheet resistance of 2000Ω/square, 0.19 with sheet resistance of 1000Ω/square, 0.34 with sheet resistance of 400Ω/square and 0.49 with sheet resistance of 200Ω/square. With increasing of the film length, the optimum sheet resistance is fixed and power losses increase proportional to the length. With increasing of the film width, the optimum sheet resistance shift to lower value and power losses increase. With increasing of the film thickness, both the optimum sheet resistance and power losses are almost same for all thicknesses. Designing a magnetic film based on optimum sheet resistance and ferromagnetic resonance, the simulated power loss reached 0.53, which was increased by 63% compared with nonmagnetic film.
Discussion for Effective Use of Integrated Thin Film Type RF Noise Suppressors

MARUTA Kaori, MUROGA Syo, SHIMADA Yutaka, YAMAGUCHI Masahiro

電子情報通信学会技術研究報告. EMCJ, 環境電磁工学　2006/10/19
Discussion for Optimum Sheet Resistance for Integrated Type RF Electromagnetic Noise Suppressors using Magnetic Films

丸田佳織, 室賀翔, 菅原雅也, 島田寛, 山口正洋

日本応用磁気学会学術講演概要集　2006
磁性薄膜を用いた次世代RF電磁ノイズ抑制体の開発

丸田佳織, 菅原雅也, 室賀翔, 島田寛, 山口正洋

仙台チャプタ-コロキウム　2006

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Industrial Property Rights 5

高周波電磁界測定装置

遠藤恭, 山口正洋, 島田寛, 室賀翔

特許第6327614号

Property Type: Patent
ノイズ抑制部材

山口正洋, 室賀翔

特許第6044021号

Property Type: Patent
高周波電磁界測定装置

遠藤恭, 山口正洋, 島田寛, 室賀翔

Property Type: Patent
コモンモードノイズ抑制部材

室賀翔, 田中元志

Property Type: Patent
ノイズ抑制部材

山口正洋, 室賀翔

Property Type: Patent

Research Projects 13

超軽量超広帯域電波吸収体を用いた次世代エアモビリティと次世代通信の共生技術

室賀翔, 上野智永, 高橋翔太郎

System: 総務省持続可能な電波有効利用のための基盤技術研究開発事業(FORWARD)

2024/08 - 2028/03
高炭酸ガス吸入が運動時の呼吸応答と脳波に及ぼす影響

加藤貴英, 早坂太一, 室賀翔

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(C)

Institution: 豊田工業高等専門学校

2021/04/01 - 2025/03/31

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【目的】運動時の呼吸応答に対する高炭酸ガス吸入および低酸素の影響について脳波解析を加えて検証することを目的として研究を進行している．その中で，今年度は基礎資料の収集として呼吸化学調節因子である動脈血二酸化炭素分圧および動脈血酸素分圧の変化に対する換気応答と脳活動の関連性を検証した．【実施内容】20歳代の被験者を対象に高炭酸ガス換気応答テスト（再呼吸法）と低酸素換気応答テスト（isocapnic progressive hypoxia）を実施した．換気応答テスト中，ワイヤレス脳波計を用いて脳波を記録した．2021年度は10名の被験者から高炭酸ガス換気応答テストおよび低酸素換気応答テスト中の脳波を記録することができた．現在，脳波解析専用ソフトを用いてデータ解析を進めている段階である．非侵襲を前提に実験を実施したため，動脈血二酸化炭素分圧値および動脈血酸素分圧値については，呼気ガス分析による終末呼気二酸化炭素分圧値および終末呼気酸素分圧値をそれぞれ代用した．終末呼気二酸化炭素分圧の上昇に伴った換気量の増加と脳波データ，および終末呼気酸素分圧の低下に伴った換気量の増加と脳波データを被験者一人ひとり確認したところ，解析途中の段階ではあるが，高炭酸ガス換気応答時のα波が低酸素換気応答時よりも大きく変化している傾向を示した．本研究結果から，動脈血二酸化炭素分圧の上昇の方が動脈血酸素分圧の低下よりも呼吸中枢に対する刺激が強いことを脳波データから導き出せる可能性が示された．
Development of spin-wave resonators by multiple local spin-orbit torque excitations and their application to high-frequency devices

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: National Institute of Technology(KOSEN), Oshima College

2021/04/01 - 2024/03/31
Inductive Coupling Estimation System Using Loop Current Model of Mounted Circuit Components

Muroga Sho

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: Akita University

2020/04/01 - 2023/03/31

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A novel estimation method of magnetic coupling coefficients between printed-circuit-board-level traces and components using a near field information was investigated and proposed. First, a simple one-turn loop current model with uniform current distribution was proposed as the equivalent magnetic source of the traces. The measured magnetic near-field distributions above the traces at 1 GHz were input to the trained classifier or regressor to estimate the geometry of the loop current models. Next, the magnetic coupling coefficient between two traces was estimated through calculating the coupled magnetic flux between the estimated loop current models. The magnetic coupling coefficients between the loop current models estimated by measured magnetic near-field distribution agreed with the coupling coefficients calculated by the full-wave simulation within 10%, which indicates the feasibility of estimating the magnetic field coupling by the proposed method.
Study on the magnetization dynamics of ultra-thin magnetic films using a newly proposed high-frequency magnetization measurement technique

ENDO Yasushi

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: Tohoku University

2017/04/01 - 2020/03/31

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This study focuses on the magnetization dynamics of the magnetic ultrathin films which was one of the fundamental parameter for the new energy saving type spintronics devices. This study also reports the development of our proposed measurement technique for the magnetization dynamics in magnetic thin films, which employs a microstripe line probe to detect ferromagnetic resonance spectra for a film sample either with or without tensile stress, and then investigates the mechanism of magnetization dynamics in their films using this measurement technique. This measurement technique allows for more precise evaluation of magnetization dynamics by providing information on both the saturation magnetization and damping constant simultaneously for individual sample. Additionally, as for the mechanism of magnetization dynamics in these films, their results demonstrate these parameters show more consistent relation suggesting that they are both originated from spin-orbital coupling.
A short haul interconnect on 3DICs for neuromorphic computing and deep learning application

Yoshikawa Takefumi

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)

2017/04/01 - 2020/03/31

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This research aims for power reduction on Through Silicon Vias (TSVs) which extend in the stacking direction between three-dimensionally mounted high-density LSI chips. For the power reduction, we proposes charge recycling transmission scheme of stacked I/O configuration. In the proposed scheme, we also show theoretical approach to clarify the power reduction ratio. The approach suggests that 32-64-bits bus width is suitable for the transmission scheme. Using the bus width, actual circuits has been designed in standard CMOS process. Simulations of the circuit shows that the power consumption is comparable to the prior art of special semiconductor process. This suggests that cutting-edge power reduction can be achieved by standard CMOS process and wide bus width. Then, test-chip has been actually prototyped using a 65 nm CMOS process.
磁性膜を用いた電磁ノイズ抑制体のイントラデカップリング機構の明確化に関する研究 Competitive

室賀翔

Offer Organization: 内藤科学技術振興財団

System: 研究助成金

2016/08 - 2017/07
Control of Spin-dynamics Associated with Scale and its Device Application

ENDO YASUSHI, Shimada Yutaka, Miyazaki Takamichi, Muroga Sho

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: Tohoku University

2014/04/01 - 2017/03/31

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This study reports the fundamental properties of spin-dynamics in Fe-M binary alloys and Co soft magnetic alloys with various shapes, clarifies understanding both the mechanism of spin-dynamics and the control of spin-dynamics, and further suggests the material design guide. All alloys possess the correlation between a damping constant and a saturation magnetostriction regardless of scales. These results reveal that the mechanism of spin-dynamics is derived from the spin-orbital coupling. These results also suggest that the spin dynamics can be controlled by composition ratio, variation in the scales (thickness and size), and other elements addition. Furthermore, as for the material design guides, it is very important to select both the ferromagnetic resonance (FMR) frequency and its line-width carefully: FMR frequency can be estimated by considering the demagnetizing field based on the scale of the alloys. The line-width is designed with the statics magnetic properties of the alloys.
電波送信・受信に挑戦しよう！ Competitive

室賀翔

Offer Organization: 日本学術振興会

System: 研究成果の社会還元・普及事業

2016/04 - 2017/03
Study on magnetic-flux band-pass filter using magnetic film

Muroga Sho

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

Category: Grant-in-Aid for Young Scientists (B)

2013/04/01 - 2016/03/31

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This study demonstrates and analytically discussed that a magnetic film becomes transparent for the magnetic flux when the relative permeability of the magnetic film becomes negative above the intrinsic ferromagnetic resonance frequency. The shielding effectiveness of the magnetic flux through the magnetic film was evaluated by a magnetic circuit considering leakage magnetic flux from the magnetic film and demonstrated by the near field measurement using shielded loop coil type magnetic field probe. In this case, the coplanar and microstrip transmission lines was developed as a flux source. As a result, it was clarified that the magnetic flux in the magnetic circuit increases when the magnetic circuit resonated with a negative reluctance of magnetic film. Therefore, the magnetic film can behave as a bandpass filter.
磁性膜を用いた誘導磁界に対する帯域通過フィルターに関する研究 Competitive

室賀翔

Offer Organization: 日本学術振興会: 科学研究費補助金

System: 若手研究(B)

2013/04 - 2016/03
Impedance Control Technique of On-Chip Power Distribution NetworkUsing Magnetic Film

MUROGA Sho

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity start-up

Category: Grant-in-Aid for Research Activity start-up

Institution: Tohoku University

2012 - 2012

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This project discussed the impedance calculation technique of on-chip power distribution network using ferromagnetic resonance loss generated in magnetic films at GHz frequency range. We evaluated the magnetic circuit model with the leakage magnetic flux path for considering the demagnetizing field generated in the magnetic film. The result shows the ferromagnetic film integrated onto the on-chip power lines can be designed by an electromagnetic field simulator based on the Maxwell's equation at 1-7GHz.
チップ・パッケージレベルのノイズ抑制を目的とした磁性膜応用に関する研究

室賀翔

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

2010 - 2011

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本研究課題では,磁性薄膜で生じる伝導および誘導ノイズ抑制効果を利用し,チップおよびパッケージ間のインター/イントラデカップリング効果を最大とする設計指針を確立することを目的としている,本年度は,研究実施計画に基づいて,以下の2点についての研究を遂行した. 1.磁性膜を回路上に配置することによる磁束分布の変化の明確化昨年度,ICチップ上に集積化したCoZrNb膜によるシールド効果は,1.1 GHzの強磁性共鳴周波数以下の周波数帯域では効果があったが,共鳴周波数以上の周波数帯域において負となる周波数帯が存在すること,その定量的な導出ができていない等,設計指針を考察するにあたり課題が存在していた.これに対し本年度は,シールド効果を磁性膜の外部空間も含めた磁気回路[室賀翔,電気学会全国大会,2-144,Mar.2012]を構築し,シールド効果の定量的な導出を行い,その妥当性をコプレーナ上に配置した250 nm厚のCoZrNb膜によるシールド効果の近傍磁界計測により実証した.これにより,磁性膜の寸法・材料特性および磁性膜に生じる反磁界を考慮することで,シールド効果を定量的に導出可能となった.更に,磁性膜によるチップ外部への誘導ノイズ減効果,すなわちチップレベルのインターデカップリングへの有用性を示した. 2.イントラデカップリングの実証実験同一面内に2つのコイルを配置したICチップ上に300 nm厚のCoZrNb膜を体積し,コイル間の伝送特性を計測した結果,1.8 GHzにおいて18 dBの抑制効果が得られた.この結果より,磁性膜によるチップ内部への誘導ノイズ減効果,すなわちチップレベルのイントラデカップリングへの有用性を示した.更に,この結果は,1で述べた磁性膜の寸法・材料特性および磁性膜に生じる反磁界を考慮し,導出した解析結果と一致している. 以上の結果より,磁性膜の寸法・材料特性および磁性膜に生じる反磁界を考慮し,1.で述べた磁気回路網を用いれば,インター/イントラデカップリング効果を最大とする膜設計が可能となることを示した.

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Social Activities 1

豊田高専ドミタウン

2015/04 -