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Paper Abstract and Keywords
Presentation 2026-03-05 11:50
RF/IF Isolation and Conjugation Accuracy Improvement of Mixer for Phase-Conjugate Loop
Takayuki Matsumuro (ATR), Akio Wakejima (Kumamoto Univ.) MW2025-201
Abstract (in Japanese) (See Japanese page) 
(in English) A both-side retrodirective scheme (BOARD-WPT) has attracted attention as a leakage-reduction method for wireless power transmission systems. In this scheme, a phase-conjugate loop is formed between the transmitter and receiver through mutual re-transmission of phase-conjugated waves. Therefore, the non-ideal characteristics of the phase-conjugate mixer can significantly affect the loop operation. In particular, insufficient RF/IF isolation results in leakage components that distort the amplitude and phase of the conjugated signal, thereby degrading conjugation accuracy. In this study, an equivalent mixer model incorporating RF/IF leakage is introduced, and the relationships between RF/IF isolation and the resulting phase and amplitude errors are theoretically clarified. Furthermore, a leakage cancellation principle based on a dual-mixer configuration with 180° hybrids is presented, and the sensitivity to branch phase imbalance is evaluated. The results show that the effective isolation at the Σ port is primarily limited by the branch phase imbalance rather than the isolation performance of a single mixer. To achieve an effective isolation of 45 dB, the branch phase imbalance must be suppressed within approximately 8°. These results provide design guidelines for improving conjugation accuracy in phase-conjugate loop applications.
Keyword (in Japanese) (See Japanese page) 
(in English) Phase Conjugation / RF/IF Isolation / Mixer / Leakage Cancellation / Wireless Power Transmission / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 394, MW2025-201, pp. 28-32, March 2026.
Paper # MW2025-201 
Date of Issue 2026-02-26 (MW) 
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 MW2025-201

Conference Information
Committee MW  
Conference Date 2026-03-05 - 2026-03-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Setoda city hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave, etc. 
Paper Information
Registration To MW 
Conference Code 2026-03-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) RF/IF Isolation and Conjugation Accuracy Improvement of Mixer for Phase-Conjugate Loop 
Sub Title (in English)  
Keyword(1) Phase Conjugation  
Keyword(2) RF/IF Isolation  
Keyword(3) Mixer  
Keyword(4) Leakage Cancellation  
Keyword(5) Wireless Power Transmission  
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Keyword(7)  
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1st Author's Name Takayuki Matsumuro  
1st Author's Affiliation Advanced Telecommunications Research Institute International (ATR)
2nd Author's Name Akio Wakejima  
2nd Author's Affiliation Kumamoto University (Kumamoto Univ.)
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Speaker Author-1 
Date Time 2026-03-05 11:50:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2025-201 
Volume (vol) vol.125 
Number (no) no.394 
Page pp.28-32 
#Pages 5 
Date of Issue 2026-02-26 (MW) 

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