| Presentation | 2021-07-02 Cavity Resonant Wireless Power Transfer Based on Online S-parameter Estimation Keito Takiya, Shinnosuke Kondo, Kentarou Murata, Naoki Honma, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | To improve the transmission efficiency at blind spots caused by standing waves in a cavity, a novel cavity resonant wireless power transfer that utilizes the diversity effect of dual parasitic antennas is proposed in this report. In the proposed method, the reflection characteristics for arbitrary load conditions can be predicted by estimating the S-parameters between the antennas online from the fluctuation of the reflected signal observed at the transmitting antenna during load modulation of dual parasitic antennas. Then, based on the principle of ``transmission maximization via reflection minimization'' established in an electromagnetically shielded space, the load condition that maximizes transmission efficiency can be indirectly identified by searching for the minimum point of the predicted reflection response surface. In an experiment conducted in a 200-mm metal cavity, the transmission efficiency was improved by up to 14.4 times compared with the case of using a single parasitic antenna, and spatial uniformity with a transmission efficiency of approximately 50% or more at most measurement points, was achieved by the proposed method. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Wireless power transfer / Cavity resonance / Parasitic antenna / S-parameter / Load modulation |
| Paper # | WPT2021-5 |
| Date of Issue | 2021-06-25 (WPT) |
| Conference Information | |
| Committee | EMCJ / EMD / WPT |
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| Conference Date | 2021/7/2(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Atsuhiro Nishikata(Tokyo Inst. of Tech.) / Yoshiki Kayano(Univ. of Electro-Comm.) / Toshio Ishizaki(Ryukoku Univ.) |
| Vice Chair | Kimihiro Tajima(NTT-AT) |
| Secretary | Kimihiro Tajima(NAIST) / (Hitachi) / (Nippon Inst. of Tech.) |
| Assistant | Kiyoto Matsushima(Hitachi) / Hiroyoshi Shida(EMC Tech.) / Toru Matsushima(Kyushu Inst. of Tech.) / Yuichi Hayashi(ＮＡＩＳＴ) / Kazuaki Miyanaga(Fujitsu Component) / Yoshiaki Narusue(Univ. of Tokyo) / Yuki Tanaka(Panasonic) |
| Paper Information | |
| Registration To | Technical Committee on Electromagnetic Compatibility / Technical Committee on Electromechanical Devices / Technical Committee on Wireless Power Transfer |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Cavity Resonant Wireless Power Transfer Based on Online S-parameter Estimation |
| Sub Title (in English) | |
| Keyword(1) | Wireless power transfer |
| Keyword(2) | Cavity resonance |
| Keyword(3) | Parasitic antenna |
| Keyword(4) | S-parameter |
| Keyword(5) | Load modulation |
| 1st Author's Name | Keito Takiya |
| 1st Author's Affiliation | Iwate University(Iwate Univ.) |
| 2nd Author's Name | Shinnosuke Kondo |
| 2nd Author's Affiliation | Iwate University(Iwate Univ.) |
| 3rd Author's Name | Kentarou Murata |
| 3rd Author's Affiliation | Iwate University(Iwate Univ.) |
| 4th Author's Name | Naoki Honma |
| 4th Author's Affiliation | Iwate University(Iwate Univ.) |
| Date | 2021-07-02 |
| Paper # | WPT2021-5 |
| Volume (vol) | vol.121 |
| Number (no) | WPT-84 |
| Page | pp.pp.1-6(WPT), |
| #Pages | 6 |
| Date of Issue | 2021-06-25 (WPT) |