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Paper Abstract and Keywords
Presentation 2023-06-30 15:30
[Invited Lecture] Impedance Inversion Wireless Matching Circuit Using Qi Coils
Ryoya Honda, Hiroki Ito, Minoru Mizutani (PW) WPT2023-13
Abstract (in Japanese) (See Japanese page) 
(in English) We report on the matching circuit designed in the matching circuit contest (85 kHz category) held on March 17, 2023. This contest was a competition to magnify the transmission coefficient |S21|2 of a 2-port network of circuits connected to a fabricated matching circuit and a pre-distributed Zkown circuit. We speculate that the Zknown circuit may satisfy the gyrator characteristic. To verify this speculation, we confirm the input-output current-voltage characteristics and impedance conversion characteristics of the ideal gyrator. As a result, we find that the Zkown circuit shows the gyrator characteristic. Next, we show that the vertical connection of gyrators with equal gyration resistances satisfies the Through characteristic. Taking advantage of this characteristic, in this contest we fabricate a gyrator with equal gyration resistance to the Zknown circuit and match it to 50 Ω. While there are several circuit configurations that satisfy the gyrator property, we fabricate a wireless gyrator with a Qi coil, named after the organizer. As a result of the competition, the fabricated wireless gyrator resulted in |S21| = —1.7291 dB, |S21|2 =0.67. This result was the highest among the participating teams and won the grand prize. This paper reports on the design method of the prototype wireless gyrator using Qi coils.
Keyword (in Japanese) (See Japanese page) 
(in English) WPT contest / Inductive coupling / Qi coils / Gyrator / Impedance matching / / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 93, WPT2023-13, pp. 13-17, June 2023.
Paper # WPT2023-13 
Date of Issue 2023-06-23 (WPT) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 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)
Download PDF WPT2023-13

Conference Information
Committee WPT  
Conference Date 2023-06-30 - 2023-06-30 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To WPT 
Conference Code 2023-06-WPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Impedance Inversion Wireless Matching Circuit Using Qi Coils 
Sub Title (in English)  
Keyword(1) WPT contest  
Keyword(2) Inductive coupling  
Keyword(3) Qi coils  
Keyword(4) Gyrator  
Keyword(5) Impedance matching  
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Keyword(8)  
1st Author's Name Ryoya Honda  
1st Author's Affiliation Power Wave Co., Ltd., (PW)
2nd Author's Name Hiroki Ito  
2nd Author's Affiliation Power Wave Co., Ltd., (PW)
3rd Author's Name Minoru Mizutani  
3rd Author's Affiliation Power Wave Co., Ltd., (PW)
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Speaker Author-1 
Date Time 2023-06-30 15:30:00 
Presentation Time 25 minutes 
Registration for WPT 
Paper # WPT2023-13 
Volume (vol) vol.123 
Number (no) no.93 
Page pp.13-17 
#Pages 5 
Date of Issue 2023-06-23 (WPT) 

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