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Paper Abstract and Keywords
Presentation 2021-07-02 14:20
Cavity Resonant Wireless Power Transfer Based on Online S-parameter Estimation
Keito Takiya, Shinnosuke Kondo, Kentarou Murata, Naoki Honma (Iwate Univ.) WPT2021-5
Abstract (in Japanese) (See Japanese page) 
(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) 
(in English) Wireless power transfer / Cavity resonance / Parasitic antenna / S-parameter / Load modulation / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 84, WPT2021-5, pp. 1-6, July 2021.
Paper # WPT2021-5 
Date of Issue 2021-06-25 (WPT) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee EMCJ EMD WPT  
Conference Date 2021-07-02 - 2021-07-02 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To WPT 
Conference Code 2021-07-EMCJ-EMD-WPT 
Language Japanese 
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  
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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.)
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Speaker Author-1 
Date Time 2021-07-02 14:20:00 
Presentation Time 25 minutes 
Registration for WPT 
Paper # WPT2021-5 
Volume (vol) vol.121 
Number (no) no.84 
Page pp.1-6 
#Pages
Date of Issue 2021-06-25 (WPT) 


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