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Paper Abstract and Keywords
Presentation 2026-06-04 14:00
[Invited Lecture] EP Tracking via PWM Load Switching in a PT-Symmetry-Based Wearable WPT
Teppei Fukui, Akihito Noda (KUT) SRW2026-3 MWPTHz2026-3
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes an active load modulation method for parity-time (PT) symmetric wireless power transfer (WPT) to achieve high-efficiency power delivery to clothing equipped with multiple sensor nodes. As an example of a power transmission method that preserves wearability and comfort, we consider a system where a battery mounted on the belt transmits power wirelessly to a receiving coil embedded in a shirt. In PT-symmetric WPT, the exceptional point (EP) marks the boundary for maintaining constant efficiency. We demonstrate that this EP is strictly determined by the external quality factor. Consequently, when circuit parameters are fixed, an intrinsic tradeoff emerges where aiming for higher efficiency narrows the operating range. To overcome this limitation, we propose a simple circuit configuration and control scheme that actively tracks the EP according to the coupling state by adjusting the effective load resistance via PWM switching. Circuit simulations confirm that tracking the EP with the proposed method enables high-efficiency WPT over a wide range.
Keyword (in Japanese) (See Japanese page) 
(in English) Wireless power transfer (WPT) / parity-time symmetry (PT symmetry) / wearable systems / two-dimensional communication / contactless power transfer / PWM control / Active load modulation /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 55, SRW2026-3, pp. 7-12, June 2026.
Paper # SRW2026-3 
Date of Issue 2026-05-28 (SRW, MWPTHz) 
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 SRW2026-3 MWPTHz2026-3

Conference Information
Committee SRW MWPTHz  
Conference Date 2026-06-04 - 2026-06-05 
Place (in Japanese) (See Japanese page) 
Place (in English) NICT Innovation center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) MWPTHz, WLAN, WPAN, Ad-hoc, mmWave, THz, etc. 
Paper Information
Registration To SRW 
Conference Code 2026-06-SRW-MWPTHz 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) EP Tracking via PWM Load Switching in a PT-Symmetry-Based Wearable WPT 
Sub Title (in English)  
Keyword(1) Wireless power transfer (WPT)  
Keyword(2) parity-time symmetry (PT symmetry)  
Keyword(3) wearable systems  
Keyword(4) two-dimensional communication  
Keyword(5) contactless power transfer  
Keyword(6) PWM control  
Keyword(7) Active load modulation  
Keyword(8)  
1st Author's Name Teppei Fukui  
1st Author's Affiliation Kochi University of Technology (KUT)
2nd Author's Name Akihito Noda  
2nd Author's Affiliation Kochi University of Technology (KUT)
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Speaker Author-1 
Date Time 2026-06-04 14:00:00 
Presentation Time 25 minutes 
Registration for SRW 
Paper # SRW2026-3, MWPTHz2026-3 
Volume (vol) vol.126 
Number (no) no.55(SRW), no.56(MWPTHz) 
Page pp.7-12 
#Pages 6 
Date of Issue 2026-05-28 (SRW, MWPTHz) 

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