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Paper Abstract and Keywords
Presentation 2024-07-19 16:40
[Invited Talk] A Consideration of Distance Property of Maximum Transmission Efficiency for Coupled and Radiative Wireless Power Transfer
Hiroshi Hirayama (NIT) WPT2024-14
Abstract (in Japanese) (See Japanese page) 
(in English) For the purpose of a comprehensive understanding of microwave (radiated) and coupled wireless power transmission, the distance characteristics of the maximum transmission efficiency between couplers (antennas, coils, etc.) are numerically investigated. As a result, 1) if the transmission distance is larger than λ/2π and the effective aperture area of the antenna is sufficiently small compared to the beam spot size, the maximum transmission efficiency is inversely proportional to the square of the distance according to Friis transmission formula. The optimum impedance at which the maximum transmission efficiency is achieved is independent of the distance. 2) If the transmission distance is larger than λ/2π and the effective aperture area of the antenna is negligible compared to the beam spot size (Fresnel region), the maximum transmission efficiency follows the modified Friis transmission formula. 3) If the distance is smaller than λ/2π and the coupler size is sufficiently small with respect to the wavelength, the maximum transmission efficiency is 100% independent of the transmission distance, based on the energy conservation law, if conductor losses are ignored. It is then necessary to vary the optimum impedance depending on the transmission distance. 4) If conductor losses are not negligible in 3), the slope of the maximum transmission efficiency with respect to distance depends on conductor losses. The above enables a seamless understanding of microwave power transmission based on Friis transmission formula and coupled wireless power transmission based on power electronics technology where the coupling between coils can be represented by a transformer.
Keyword (in Japanese) (See Japanese page) 
(in English) Radiative Wireless Power Transfer / Coupled Wireless Power Transfer / Maximum transmission efficiency / / Optimum impedance / Near-filed and Far-field / /  
Reference Info. IEICE Tech. Rep., vol. 124, no. 117, WPT2024-14, pp. 1-6, July 2024.
Paper # WPT2024-14 
Date of Issue 2024-07-12 (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 WPT2024-14

Conference Information
Committee EMCJ WPT EMD  
Conference Date 2024-07-19 - 2024-07-19 
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 2024-07-EMCJ-WPT-EMD 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Consideration of Distance Property of Maximum Transmission Efficiency for Coupled and Radiative Wireless Power Transfer 
Sub Title (in English)  
Keyword(1) Radiative Wireless Power Transfer  
Keyword(2) Coupled Wireless Power Transfer  
Keyword(3) Maximum transmission efficiency  
Keyword(4)  
Keyword(5) Optimum impedance  
Keyword(6) Near-filed and Far-field  
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Keyword(8)  
1st Author's Name Hiroshi Hirayama  
1st Author's Affiliation Nagoya Institute of Technology (NIT)
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Speaker Author-1 
Date Time 2024-07-19 16:40:00 
Presentation Time 25 minutes 
Registration for WPT 
Paper # WPT2024-14 
Volume (vol) vol.124 
Number (no) no.117 
Page pp.1-6 
#Pages 6 
Date of Issue 2024-07-12 (WPT) 

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