論文 - 西川　健二郎

Satoshi Yoshida, Shunya Asakura, Shuhei Yamanokuchi, Kenjiro Nishikawa .  152.6% Fractional Bandwidth UHF-to-Microwave Band Compact Rectifier Utilizing the Conditions for Flat Frequency Characteristics of RF-DC Conversion Efficiency .  IEEE Microwave and Wireless Components Letters32 ( 6 ) 595 - 598   2022年3月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE  

DOI： 10.1109/LMWC.2022.3143844

CiNii Research

Satoshi Yoshida, Suguru Kameda, Noriharu Suematsu, Kenjiro Nishikawa .  Re ‐Evaluation of a Dual‐Feed Linear Polarized 2‐by‐2 Circular Patch Array Antenna for 60‐GHz‐Band Digital Beamforming Applications .  IEEJ Transactions on Electrical and Electronic Engineering16 ( 12 ) 1653 - 1655   2021年12月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Wiley  

<jats:p>In this letter, re‐evaluation results of a 60‐GHz‐band digital beamforming antenna using a dual‐feed linear polarized 2 × 2 circular patch array antenna is reported. The extension from our previous report is providing new measurement data under the condition of all intermediate frequency (IF) signal usage by re‐fabrication, although we reported imperfect measurement results using the IF signals only 5 ch out of 8 ch in the previous report due to the fabrication error. A low temperature solder paste was newly used to prevent the warp of the multilayered substrate. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.</jats:p>

DOI： 10.1002/tee.23478

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Ren Furumoto, Hayato Shimizu, Kenjiro Nishikawa .  Design of 94GHz High Efficiency Rectifier MMIC .  2021 IEEE Asia-Pacific Microwave Conference (APMC)   2021年11月

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IEEE  

DOI： 10.1109/apmc52720.2021.9661998

Koshi Hamano, Hayato Shimizu, Kenjiro Nishikawa .  Analysis of Phase Offset Impact on Millimeter-wave Broadband Doherty Amplifier MMIC .  2021 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)   2021年8月招待 査読

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IEEE  

DOI： 10.1109/RFIT52905.2021.9565245

CiNii Research

古本 廉, 清水 駿斗, 西川 健二郎 .  94GHz帯高効率整流回路MMICの設計 .  電気学会研究会資料. EMT = The papers of technical meeting on electromagnetic theory, IEE Japan / 電磁界理論研究会 [編]2021 ( 26-35・37-50 ) 17 - 22   2021年7月

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記述言語：日本語   出版者・発行元：東京 : 電気学会  

CiNii Research

Satoshi Yoshida, Kenjiro Nishikawa .  Expansion Technique of the Beamforming Area for 60-GHz-Band Beamforming Array Antenna in Mobile Wireless Terminal Application .  2021 13th Global Symposium on Millimeter-Waves & Terahertz (GSMM)   2021年5月査読

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IEEE  

DOI： 10.1109/GSMM53250.2021.9511914

CiNii Research

Satoshi Yoshida, Mizuki Motoyoshi, Suguru Kameda, Noriharu Suematsu, Kenjiro Nishikawa, and Shigeo Kawasaki .  Expansion of the Beamforming Coverage Area in an Elevation Plane for 60-GHz-Band 3D Beamforming .  IEEE Antennas and Wireless Propagation Letters20 ( 5 ) 773 - 775   2021年5月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1109/LAWP.2021306

Satoshi Yoshida, Kenjiro Nishikawa, and Shigeo Kawasaki .  C-Band Frequency Tunable Rectifier Designed by HySIC Concept Utilizing GaAs MMIC and Si RFIC .  IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS30 ( 10 ) 997 - 1000   2020年9月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1109/LMWC.2020.30

Hayato Shimizu, Yudai Iwashita, Ryotaro Iwamoto and Tamio Kawaguchi, and Kenjiro Nishikawa .  6 - 10 GHz Cryogenic GaAs pHEMT LNA MMIC .  2020 IEEE International Symposium on Radio Frequency Integrated Technology (RFIT)   117 - 119   2020年9月査読

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IEEE MTT-S  

Kenjiro Nishikawa and Satoshi Yoshida .  Rectifier Design Challenges Towards Wide Dynamic Range Performance (invited) .  2020 IEEE International Symposium on Radio Frequency Integrated Technology (RFIT)   227   2020年9月招待 査読

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IEEE MTT-S  

Runyuan Li, Satoshi Yoshida, Yasunori Suzuki, Hiroshi Okazaki, and Kenjiro Nishikawa .  Investigation of Rectifier Operation with Harmonic Controlled Input Signals Towards Pulse Modulation WiCoPT System (RFIT2020 Student Award) .  2020 IEEE International Symposium on Radio Frequency Integrated Technology (RFIT)   228 - 230   2020年9月査読

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IEEE MTT-S  

Takuya Obara, Satoshi Yoshida, Kenjiro Nishikawa, and Shigeo Kawasaki .  Analysis and Optimization of GaN Diode Structure for High Power and High Efficiency Rectifier .  URSI XXXIIIrd General Assembly and Scientific Symposium (URSI GA2020)   D03-05   2020年8月査読

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：URSI  

その他リンク： http://www.ursi.org/proceedings/procGA20/papers/SPCSummaryObara.pdf

Satoshi Yoshida, Kenjiro Nishikawa, and Shigeo Kawasaki .  Initial Verification of a Bandwidth Tunable Ku-Band Power Amplifier Designed by the HySIC Concept .  IEICE Communications Express9 ( 12 ) 599 - 604   2020年7月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1587/comex.2020COL0007

Satoshi Yoshida, Kentaro Matsuura, Daisuke Kobuchi, Naoto Yabuta, Toshihiro Nakaoka, Kenjiro Nishikawa, and Shigeo Kawasaki .  The K-Band Communication Transmitter/Receiver Powered by the C-Band HySIC Energy Harvester with Multi-Sensors .  2020 IEEE MTT-S International Microwave Symposium   1180 - 1183   2020年6月査読

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IEEE MTT-S  

Satoshi yoshida and Kenjiro Nishikawa .  Experimental Verification of Excavated Structure on Multi-Layered Substrates for Millimeter-Wave Signal Vertical Transition Using Copper Balls .  IEEE Accessvol.8   2362 - 2372   2019年12月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE  

This paper presents a vertical transition of millimeter-wave signal for interconnection between multi-layered substrates, which utilizes copper balls for vertical interconnection, as both for electrical connection and physical support. In particular, the copper balls were used to configure a quasi-coaxial transmission line at the vertical interconnection. The key idea was to create an excavated structure at the location of the copper balls to fix it, given that the copper balls slightly fluctuate during reflow soldering when simply placed on a flat surface. Such activity of the copper balls defines large variation in transmission characteristics at millimeter-wave band that produce low yield rate. Practically, with the proposed method of an excavated structure, the location error of the copper balls can be minimized, leading to high reproducibility in determining the copper balls location, and small variation of the transmission characteristics. To verify the method’s effectiveness, a prototype having three vertically stacked multi-layered substrates with the excavated structure was fabricated. The excavation had a depth of 90 m and diameter of 0.45 mm. The copper balls used had a 0.3-mm diameter. Five samples were fabricated and then evaluated by X-ray images and S-parameter measurements. Based on the results, the reflection characteristics of the measurement were less than –10 dB from dc to 97 GHz in the best-case scenario, whereas the variation in the S-parameters was comparatively small up to 70 GHz. Moreover, the X-ray images showed relatively small copper balls location error. These results indicate that the proposed excavated structure is effective for millimeter-wave vertical interconnections using copper balls, in small wireless terminal applications.

DOI： 10.1109/ACCESS.2019.2961624

Satoshi Yoshida and Kenjiro Nishikawa .  60-GHz-Band Dipole Array Antenna Using Copper Balls Interconnection With Excavated Structure .  2019 Antennas Design and Measurement International Conference (ADMInC)   111 - 113   2019年10月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE  

DOI： 10.1109/ADMInC47948.2019.8969339

Daisuke Kobuchi, Kentaro Matsuura, Yoshiaki Narusue, Satoshi Yoshida, Kenjiro Nishikawa, and Shigeo Kawasaki .  Smart Wireless Sensor System by Microwave Powering for Space-by-Wireless .  2019 IEEE MTT-S International Microwave SymposiumTH2G-2   1144 - 1147   2019年6月査読

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IEEE MTT-S  

DOI： 10.1109/MWSYM.2019.8701077

Ayako Suzuki, Koshi Hamano, Hayato Shimizu, Hiroshi Okazaki, Yasunori Suzuki, Kunihiro Kawai, Atsushi Fukuda, and Kenjiro Nishikawa .  Wide dynamic range rectifier circuit with varactor tuning technique .  2019 IEEE Wireless Power Transfer Conference (WPTC2019)WPTC2-4   45 - 48   2019年6月査読

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IEEE MTT-S  

DOI： 10.1109/WPTC45513.2019.9055633

Satoshi Yoshida, Kenjiro Nishikawa, and Shigeo Kawasaki .  10W Class High Power C-Band Rectifier Using GaN HEMT .  2019 IEEE Wireless Power Transfer Conference (WPTC2019)WPP90   595 - 598   2019年6月査読

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IEEE MTT-S  

DOI： 10.1109/WPTC45513.2019.9055692

Ryutaro Onimaru, Satoshi Yoshida, and Kenjiro Nishikawa .  60 GHz Dual-Polarized 2×2 Phased Array Antenna Using Copper Ball Interconnection (GSMM Student Paper Award) .  Global Symposium on Millimeter Wave 2019 (GSMM2019)FR2-3   65 - 68   2019年5月査読

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IEEE  

DOI： 10.1109/GSMM.2019.8797657