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Paper Abstract and Keywords
Presentation 2026-03-05 16:00
A Study on OAM Wave Focusing with Reflectarray
Takumi Aramaki, Akira Saitou, Kazuhiko Honjo, Ryo Ishikawa (UEC) MW2025-206
Abstract (in Japanese) (See Japanese page) 
(in English) We have developed a reflectarray that reflects and focuses orbital angular momentum (OAM) waves radiated from a loop antenna array.
By using the OAM waves, multiple communication on the same frequency is possible due to spatial mode orthogonality. However, they have some issues in use, such as the fact that they tend to spread and are difficult to use over long distances, and the need to align the central axis when transmitting and receiving. Therefore, we introduce a reflectarray to extend the range of OAM waves. In addition to changing the propagation direction, we also aim to extend the propagation distance by providing a focusing effect through appropriate adjustment of the reflection phase. As a first step, in this paper, we first investigated the focusing effect of the reflectarray by replacing the paraboloid reflector used for long-distance communications to focus OAM waves radiated from loop antennas with a reflectarray. In this study, it was examined that the arrangement of the reflectarray's unit cells, confirmed the characteristics of two types of unit cell structures, analyzed propagation performance, and conducted measurements in the 40 GHz band. As a result, a certain degree of OAM wave focusing effect was confirmed for lower-order mode OAM waves.
Keyword (in Japanese) (See Japanese page) 
(in English) orbital angular momentum / loop antenna array / dielectric lens / multiple communication / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 394, MW2025-206, pp. 52-57, March 2026.
Paper # MW2025-206 
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 MW2025-206

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) A Study on OAM Wave Focusing with Reflectarray 
Sub Title (in English)  
Keyword(1) orbital angular momentum  
Keyword(2) loop antenna array  
Keyword(3) dielectric lens  
Keyword(4) multiple communication  
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1st Author's Name Takumi Aramaki  
1st Author's Affiliation The University of Electro-Communications (UEC)
2nd Author's Name Akira Saitou  
2nd Author's Affiliation The University of Electro-Communications (UEC)
3rd Author's Name Kazuhiko Honjo  
3rd Author's Affiliation The University of Electro-Communications (UEC)
4th Author's Name Ryo Ishikawa  
4th Author's Affiliation The University of Electro-Communications (UEC)
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Speaker Author-1 
Date Time 2026-03-05 16:00:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2025-206 
Volume (vol) vol.125 
Number (no) no.394 
Page pp.52-57 
#Pages 6 
Date of Issue 2026-02-26 (MW) 

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