Papers - HIROSHI Hirayama

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  • Low-cost, High Accuracy, and Long Communication Range Energy-Harvesting Beat Sensor with LoRa and Ω-Antenna for Water-Level Monitoring Reviewed

    Manh-Hiep DAO, Koichiro ISHIBASHI, The-Anh NGUYEN, Duy-Hieu BUI, Hiroshi HIRAYMA, Tuan-Anh TRAN

    IEEE Sensors Journal   2025.01

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/JSEN.2025.3533014

    DOI: 10.1109/JSEN.2025.3533014

  • RF-DC Conversion Circuit using Quadrature Hybrid for Complex Maximum Power Point Tracking Reviewed

    Kozaburo Tanahashi, Hiroshi Hirayama

    2024.04

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/elex.21.20240043

  • H-Shaped Slot Antenna with Harmonic Tuning Function and Integrated Power Amplifier, Reviewed International journal

    Yuto Narita, Koichi Nozawa, Noriyuki Tanba, Shinji Hara, Hiroshi Hirayama,

    Energies   16(5) ( 2128 )   1 - 14   2023.02

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/en16052128

  • 大型核融合試験施設におけるメガワットミリ波ジャイロトロン発振器周辺の電磁環境調査 Reviewed

    田中将裕, 吉村泰夫, 伊藤哲, 王建青, 平山裕, 宇田達彦, 藤原修

    電子情報通信学会論文誌 B   J105-B ( 8 )   629 - 636   2022.08

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.14923/transcomj.2021PEP0007

  • Characteristic Mode Analysis of H-shaped Slot Patch Antenna with Class-F Load Function Reviewed

    Proc. of IEEE WPW2022   739 - 742   2022.07

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/WPW54272.2022.9901366

  • Monitoring leakage electromagnetic field around 77 GHz megawatt-class gyrotron oscillators at a large fusion test facility Reviewed

    Masahiro Tanaka, Yasuo Yoshimura, Satoshi Ito, Kensuke Sasaki, Jianqing Wang, Hiroshi Hirayama, Tatsuhiko Uda, Osamu Fujiwara,

    Proc. of BioEM 2022   2022.06

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Basic Characteristics of Proximity-Fed Microstrip Patch Antenna Having Class-F Load Impedance for Microwave Power Transfer Reviewed International journal

    Shunya Ban, Hiroshi Hirayama

    Proc. of AWPT2021   2021.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • A Basic Consideration of RF-DC Conversion Circuit Using Quadrature Hybrid for Complex Maximum Power Point Tracking Reviewed International journal

    Kouzaburo Tanahashi, Hiroshi Hirayama

    Proc. of AWPT2021   2021.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Reduction in Human Interaction with Magnetic Resonant Coupling WPT Systems with Grounded Loop Reviewed International coauthorship International journal

    Xianyi Duan,Junqing Lan,Yinliang Diao,Jose Gomez-Tames,Hiroshi Hirayama,Masashi Hotta,George Fischer and Akimasa Hirata

    Energies   14 ( 21 )   1 - 14   2021.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/en14217253

  • Microstrip Patch Antenna with Class-F Load and DC Block Function for Microwave Power Transfer Reviewed

    Takase Oshima, Shunya Ban, Hiroshi Hirayama

    IEICE Electronics Express   18 ( 15 )   1 - 5   2021.07

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEICE  

    DOI: 10.1587/elex.18.20210264

  • Proposal and Demonstration of Power Conversion-Chip/Amplifier Integrated Antenna Reviewed

    Shinji Hara, Asako Suzuki, Hiroshi Hirayama

    Proc. of EuMC 2020   2021.01

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • Zero-Current Switching with LC Resonant Tank Circuit and Capacitor Isolation DC-DC Converter Reviewed International journal

    Nakashima Osamu, Hirayama Hiroshi, Hiwatari Daichi, Jonokuchi Hideki

    Proc. of EPE 2020   2020.09

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  • Folded Dipole Antenna with Class-F Load Function for Rectenna of Microwave Power Transfer Reviewed

    Takase Oshima, Hiroshi Hirayama

    IEICE Communications Express   9 ( 11 )   524 - 528   2020.08

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/comex.2020XBL0105

  • Reduction of Human Interaction with Wireless Power Transfer System Using Shielded Loop Coil Reviewed International journal

    Akihiko Kumazawa, Yinliang Diao, Akimasa Hirata, Hiroshi Hirayama

    Electronics   9 ( 6 )   1 - 13   2020.06

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/electronics9060953

  • Folded Spiral Resonator with Double-Layered Structure for Near-Field Wireless Power Transfer Reviewed International journal

    Takaya Arai, Hiroshi Hirayama

    Energies   13 ( 7 )   1 - 13   2020.04

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/en13071581

  • Near-field Wireless Power Transfer for Moving Vehicle Using Collinear Array Antenna Reviewed

    Takase OSHIMA, Hiroshi HIRAYAMA

    IEICE Communications Express   8 ( 12 )   617 - 622   2019.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/comex.2019GCL0067

  • Double-layered Folded Spiral Resonator for Coupled-resonant Wireless Power Transfer Reviewed

    Takaya ARAI, Kohei NIMURA, Hiroshi HIRAYAMA

    IEICE Communications Express   8 ( 12 )   490 - 494   2019.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/comex.2019GCL0016

  • Transmission efficiency improvement using Shielded Loop Antenna for Coupled-resonant Wireless Power Transfer Reviewed

    Akihiko Kumazawa, Hiroshi Hirayama

    IEICE Communications Express   8 ( 12 )   485 - 489   2019.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/comex.2019GCL0015

  • Impedance Matching Mechanism of Shielded Loop Antenna for Wireless Power Transfer Reviewed

    Akihiko Kumazawa, Hiroshi Hirayama

    Proc. of AWPT2018   2018.11

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  • Basic Characteristics of a Double-layered Folded Spiral Resonator for Coupled-resonant Wireless Power Transfer Reviewed

    Kohei Nimura, Hiroshi Hirayama

    Proc. of AWPT2018   2018.11

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  • Mechanism of SAR Reduction of Shielded-Loop Antenna in Wireless Power Transfer Reviewed

    Kenta Yamada, Hiroshi Hirayama

    Proc. of AWPT2018   2018.11

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  • Wireless Power Transfer for Moving Vehicle Using Collinear Array Antenna Reviewed

    Jun Deguchi, Hiroshi Hirayama

    Proc. of AWPT2018   2018.11

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  • Basic Design and Analysis of Folded Dipole Antenna for 5.8 GHz Wireless Power Transfer Reviewed

    Reiji Nishigaki, Hiroshi Hirayama

    Proc. of AWPT2018   2018.11

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  • Characteristic Comparison of Various Kinds of Couplers for Near-Field Wireless Power Transfer Reviewed

    Takaya Arai, Hiroshi Hirayama

    Proc. of AWPT2018   2018.11

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  • Reduction of SAR for Wireless Power Transfer of Visual Prosthesis Using Shielded Loop Reviewed

    Yuichi Yamawaki, Hiroshi Hirayama, Hideki Jyonokuchi

    Proc. of AWPT2017   2017.12

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  • On a Transmission Efficiency of Shielded Spiral Antenna for Coupled-Resonant Wireless Power Transfer Reviewed

    Naoya Kajiura, Hiroshi Hirayama

    Proc. of AWPT2017   2017.12

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  • Basic Characteristics of a Folded Spiral Antenna for Coupled-resonant Wireless Power Transfer Reviewed

    Kohei Nimura, Hiroshi Hirayama

    Proc. of AWPT2017   2017.12

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  • Propagation Characteristics of Indoor Wireless Power Transfer Using MIMO Technology Reviewed

    Shingo Yamaji, Hiroshi Hirayama

    Proc. of AWPT2017   2017.12

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  • Review of Near-Field Wireless Power and Communication for Biomedical Applications Reviewed International coauthorship International journal

    Han-Joon Kim, Hiroshi Hirayama, Sanghoek Kim, Ki Jin Han, Rui Zhang, Ji-Woong Choi

    IEEE Access   5   21264 - 21285   2017.09

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE  

    DOI: 10.1109/ACCESS.2017.2757267

  • Suppression of Common-mode Radiation Using Folded-spiral Antenna for Wireless Power Transfer Reviewed

    Hiroshi Hirayama, Masanori Ando, Toshihito Sonobe

    Proc. of APEMC 2017   2017.06

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  • Unified Coupling and Resonant Model for Near-field Wireless Power Transfer System Invited Reviewed

    Hiroshi Hirayama

    Proc. of ICCEM2017   2017.03

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  • On a Transmission Characteristics of Open-type Double-layer Spiral Resonator for Wireless Power Transfer Reviewed International journal

    Ikuto Moriya, Hiroshi Hirayama

    Proc. of AWPT 2016   2016.12

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  • Improvement of Transmission Efficiency using Shielded-Loop Antenna for Wireless Power Transfer Reviewed International journal

    Naoya Kajiura, Hiroshi Hirayama

    Porc. of ISAP 2016   2016.10

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  • Impedance Matching using Folded Spiral Antenna for Coupled-resonant Wireless Power Transfer Reviewed International journal

    Masanori Ando, Hirosi Hirayama

    Porc. of ISAP 2016   2016.10

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  • On a Transmission Efficiency of Tape-wound Spiral Antenna for Coupled Resonant Wireless Power Transfer Reviewed International journal

    Keigo Nakamura, Hiroshi Hirayama

    Porc. of ISAP 2016   2016.10

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  • Transmission Characterisitics of Wireless Power Transfer with Self-Resonant Antenna Using an Existing Structure as a Repeater Reviewed International journal

    Shohei Fukasawa, Keigo Nakamura, Hiroshi Hirayama

    Proc. of AWPT 2015   2015.12

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  • Transmission Characteristics of Tape-wound Spiral Antenna for Coupled Resonant Wireless Power Transfer Reviewed International journal

    Keigo Nakamura, Hiroshi Hirayama

    Proc. of AWPT 2015   2015.12

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  • 電磁界から見た結合共振型無線電力伝送 Reviewed

    平山 裕,菊間 信良

    電子情報通信学会論文誌B   J98-B ( 9 )   868 - 877   2015.09

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  • 結合共振型無線電力伝送用アレーアンテナを用いた金属異物検出システムの検討 Reviewed

    矢満田 博之, 平山 裕, 菊間 信良, 榊原 久二男

    電子情報通信学会論文誌   J98-B ( 8 )   795 - 803   2015.08

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  • Wireless Power Transfer Using Self-resonant Spiral Antenna Through Reinforced Plasterboard Wall Reviewed International journal

    Hiroshi Hirayama, Shohei Fukasawa, Keigo Nakamura, Nobuyoshi Kikuma and Kunio Sakakibara

    Proc. of EuCAP 2015   2015.04

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  • Performance improvement of obstacle detection of short range MIMO sensor using signal subspace Reviewed

    Aoki Yuya, Mori Hisamichi, Kikuma Nobuyoshi, Hirayama Hiroshi, Sakakibara Kunio

    Proc. of ISAP 2014   377 - 378   2014.12

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  • DOA estimation by MUSIC algorithm using forward-backward spatial smoothing with overlapped and augmented arrays Reviewed

    Iwai Toshiki, Hirose Naoki, Kikuma Nobuyoshi, Sakakibara Kunio, Hirayama Hiroshi

    Proc. of ISAP 2014   375 - 376   2014.12

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  • Miniaturization of period of dual-band frequency selective surface by using C-shaped ring slots Reviewed

    Amano Yuto, Firdaus Kei, Sakakibara Kunio, Iwanaga Shinya, Kumaki Kiyotaka, Hori Satoshi, Kikuma Nobuyoshi, Hirayama Hiroshi

    Proc. of ISAP 2014   401 - 402   2014.12

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  • A consideration on simple decoupling circuit without three-dimensional structure for MIMO antennas Reviewed

    Mori Masahiro, Kikuma Nobuyoshi, Hirayama Hiroshi, Sakakibara Kunio

    Proc. of ISAP 2014   415 - 416   2014.12

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  • Grating lobe suppression of narrow-wall slotted waveguide array antenna using thin narrow-wall waveguides in millimeter-wave band Reviewed

    Araki Toshinori, Sakakibara Kunio, Kikuma Nobuyoshi, Hirayama Hiroshi

    Proc. of ISAP 2014   139 - 140   2014.12

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  • Low-sidelobe design of microstrip comb-line antennas for beam-tilting in perpendicular plane to feeding line Reviewed

    Nakazawa Daiki, Sakakibara Kunio, Kikuma Nobuyoshi, Hirayama Hiroshi

    Proc. of ISAP 2014   295 - 296   2014.12

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  • Performance improvement of localization of coherent near-field sources by combined use of DOA-Matrix method and SAGE algorithm Reviewed

    Takeuchi Kyohei, Kikuma Nobuyoshi, Hirayama Hiroshi, Sakakibara Kunio

    Proc. of ISAP 2014   385 - 386   2014.12

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  • EMC Characteristics of Open-end and Short-end Helical Antennas for Coupled-Resonant Wireless Power Transfer Reviewed

    Hiroshi Hirayama, Shohei Fukasawa, Hiroyuki Yamada, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of EMC Europe 2014   2014.09

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  • Undesired Emission from Coupled-Resonant Wireless Power Transfer Antenna for Fundamental and Harmonics Frequency Reviewed

    Hiroshi Hirayama, Hiroyuki Yamada, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of EMC'14 Tokyo   438 - 441   2014.05

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  • Dielectric Loading Effect of Spiral Tape Antenna for Coupled-resonant Wireless Power Transfer Reviewed

    Hiroshi Hirayama,Kanako Komatsu,Hiroyuki Yamada,Nobuyoshi Kikuma,Kunio Sakakibara

    Proc. of EuCAP 2014   2426 - 2427   2014.04

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  • Dielectric Loading Effect of Open-end Spiral Antenna for Wireless Power Transfer

    Kanako Komatsu, Hiroyuki Yamada, Hiroshi Hirayama, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of Vietnam-Japan International Symposium on Antennas and Propagation   2014.01

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  • An Investigation on Self-resonant and Capacitor-loaded Helical Antennas for Coupled-resonant Wireless Power Transfer Reviewed

    Hiroshi Hirayama, Tomohiro Amano, Nobuyoshi Kikuma, Kunio Sakakibara

    IEICE Trans. on Commun.   E96-B ( 10 )   2431 - 2439   2013.10

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  • Far-field Radiation and Near-field Leakage of Self-resonant Spiral Antennas for Coupled-resonant Wireless Power Transfer Reviewed

    Kanako Komatsu, Hiroshi Hirayama, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of EMC Europe 2013   883 - 886   2013.09

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  • Obstacle Detection Method Using Array Antenna for Coupled-resonant Wireless Power Transfer Reviewed

    Hiroyuki Yamada, Hiroshi Hirayama, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of PIERS 2013   1548 - 1551   2013.08

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  • Undesired Emission and Biological Effect of Open-end and Short-end Antennas for Coupled-resonant Wireless PowerTransfer Reviewed

    Hiroshi Hirayama, Tomohiro Amano, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of APEMC 2013   2013.05

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  • Automated Creation of Beamformer-Based Optimum DOA Estimation Algorithm Using Genetic Algorithm Reviewed

    Syunsuke Yoshimura, Hiroshi Hirayama, Nobuyoshi Kikuma, Kunio Sakakibara

    IEICE Trans. on Commun.   E95-B ( 10 )   3332 - 3336   2012.10

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  • A consideration of electric and magnetic coupling coefficient of spiral antenna for wireless power transfer Reviewed

    Kanako Komatsu, Tomohiro Amano, Hiroshi Hirayama, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of ISAP 2012   170 - 173   2012.10

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  • A consideration of helical antennas for coupled resonant wireless power transfer using equivalent circuit Reviewed

    Tomohiro Amano, Hiroshi Hirayama, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of ISAP 2012   435 - 438   2012.10

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  • Estimation of Transmission Characteristics for Coupled Resonant Wireless Power Transfer in the kHz Range Reviewed

    Hiroshi Hirayama, Yuki Okuyama, Taiki Shinhashi, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of IWPT 2012   2012.05

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  • A Consideration of Open- and Short-End Type Helical Antennas for Magnetic-Coupled Resonant Wireless Power Transfer Reviewed

    Hiroshi Hirayama, Tomohiro Amano, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of EuCAP 2012   2012.03

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  • Transmission loss of self-resonant type magnetic-coupled resonant wireless power transfer Reviewed

    Hiroshi Hirayama, Tomohiro Amano, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of ISETS 2011   2011.12

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  • Estimation of Far-fi eld Emission of Magnetic CoupledResonant Wireless Power Transmission Using EquivalentCircuit Model Reviewed

    Yuki Okuyama, Hiroshi Hirayama, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of ISAP 2011   2011.10

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  • Generation of Optimum DOA Estimation Algorithm by Using Genetic Algorithm Reviewed

    Shunsuke Yoshimura, Hiroshi Hirayama, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of ISAP 2011   2011.10

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  • On a shielding effect of magnetic-coupled resonant wireless power transfer Reviewed

    Hiroshi Hirayama, Syun Asakura, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc of EMD 2011   2011.09

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  • Basic theory of magnetic-coupled-resonant wireless power transfer and recent progress Invited Reviewed

    Hiroshi Hirayama

    Proc. of APEMC 2011   2011.05

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  • Equivalent Circuit of Induction Fed Magnetic Resonant WPT System Reviewed

    Hiroshi Hirayama, Yuki Okuyama, Nobusyohi Kikuma, Kunio Sakakibara

    Proc. of IWPT 2011   2011.05

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  • Channel Capacity Improvement in Short-range MIMO Using Side and Back Reflectors Reviewed

    Hiroshi Hirayama, Gen Matsui, Nobuyoshi Kikuma, Kunio Sakakibara

    IEICE Trans. on Commun.   E94-B ( 5 )   1280 - 1283   2011.05

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  • A Consideration of Equivalent Circuit of Magnetic-Resonant Wireless Power Transfer Reviewed

    Hiroshi Hirayama, Yuki Okuyama, Nobusyohi Kikuma, Kunio Sakakibara

    Proc. of EuCAP 2011   2011.04

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  • A New Scheme to Avoid Null Zone for HF-band RFID with Diversity Combining of Loop Antennas Reviewed

    Hiroshi Hirayama, Nobuyoshi Kikuma, Kunio Sakakibara

    IEICE Trans. on Commun.   E93-B ( 10 )   2666 - 2669   2010.10

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    DOI: 10.1587/transcom.E93.B.2666

  • A Consideration of Channel Capacity of Near-Field MIMO Using Parasitic Elements Reviewed

    Gen Matsui, Hiroshi Hirayama, Nubuyoshi Kikuma, Kunio Sakakibara

    Proc. of ISAP 2010   2010.10

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  • Undesired emission from Magnetic-resonant wireless power transfer Reviewed

    Hiroshi Hirayama, Yuki Okuyama, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of EMC Europe 2011   2010.09

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  • An consideration on equivalent circuit of wireless power transmission Reviewed

    Hiroshi Hirayama, Yuki Okuyama, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of ANTEM 2010   2010.07

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  • Improvement of channel capacity of near-field MIMO Reviewed

    Hiroshi Hirayama, Gen Matsui, Nobuyoshi Kikuma, Kunio Sakakibara

    Proc. of EuCAP 2010   2010.04

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  • An Estimation Method of Poynting Vector with Near-Magnetic-Field Measurement Reviewed

    Hiroshi Hirayama, Nobuyoshi Kikuma, Kunio Sakakibara

    IEICE Trans. On Electron IEICE   E93-C ( 1 )   66 - 73   2010.01

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    DOI: 10.1587/tansele.E93.C.66

  • A consideration of electro-magnetic-resonant coupling mode in wireless power transmission Reviewed

    Hiroshi Hirayama, Toshiyuki Ozawa, Yosuke Hiraiwa, Nobuyoshi Kikuma, and Kunio Sakakibara

    IEICE Electronics Express IEICE   6 ( 19 )   1421 - 1425   2009.10

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    DOI: 10.1587/elex.6.1421

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