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Paper Abstract and Keywords
Presentation 2024-03-15 16:15
A Beamforming Antenna using Analog Phase Shifter for 5.7GHz RF Wireless Power Transfer System
Shota Futamata, Norimasa Nakashima (FIT) WPT2023-59
Abstract (in Japanese) (See Japanese page) 
(in English) This paper persents an attempt to realize a beamforming antenna using a reflective phase shifter for 5.7GHz wireless power transfer system. After prototyping a power divider, the phase shifter, and an antenna using an FR-4 and confirming their individual operations, we will complie them as a phased array antenna and evaluate amount of beam steering. Our prototype a Wilkinson splitter yields $2[si{dB}]$ more attennation of the transmission coefficient than the ideal value. We employ a varactor using $ang{90}$hybrid in the phase shifter. The goal was to secure a phase shift of $ang{135}$ toward steering the beam direction of the phased array antenna by $pmang{45}$, but the amount of phase shift change is realized only $ang{46}$. At this point, the maximum amount of steering that could be achieved by $pmang{15}$. We designed a 4-element rectangular microstrip array antenna and confirmed that it was less than $-10[si{dB}]$ in the $5.7si{GHz}$ band. A phased array antenna was created by combining these devices. The radiation pattern was measured by applying the imposed voltage to each varactors to obtain the desired amount of phase shift, which was confirmed when measuring the phase shifter alone. As a result, the expected radiation pattern was not obtained. The cause is considered to be the effect of combining elements.
Keyword (in Japanese) (See Japanese page) 
(in English) wireless power transfer system / refrect type phase shifter / 90°hybrid coupler / analog phase shifter / phased array antenna / beamforming antenna / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 437, WPT2023-59, pp. 117-122, March 2024.
Paper # WPT2023-59 
Date of Issue 2024-03-07 (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 WPT2023-59

Conference Information
Committee WPT  
Conference Date 2024-03-13 - 2024-03-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyoto-Univ. (Uji campus) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) SSPS Technology, General WPT 
Paper Information
Registration To WPT 
Conference Code 2024-03-WPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Beamforming Antenna using Analog Phase Shifter for 5.7GHz RF Wireless Power Transfer System 
Sub Title (in English)  
Keyword(1) wireless power transfer system  
Keyword(2) refrect type phase shifter  
Keyword(3) 90°hybrid coupler  
Keyword(4) analog phase shifter  
Keyword(5) phased array antenna  
Keyword(6) beamforming antenna  
Keyword(7)  
Keyword(8)  
1st Author's Name Shota Futamata  
1st Author's Affiliation Fukuoka Institute of Technology (FIT)
2nd Author's Name Norimasa Nakashima  
2nd Author's Affiliation Fukuoka Institute of Technology (FIT)
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Speaker Author-1 
Date Time 2024-03-15 16:15:00 
Presentation Time 25 minutes 
Registration for WPT 
Paper # WPT2023-59 
Volume (vol) vol.123 
Number (no) no.437 
Page pp.117-122 
#Pages 6 
Date of Issue 2024-03-07 (WPT) 

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