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Paper Abstract and Keywords
Presentation 2026-05-15 14:20
Efficiency and Operational Bandwidth of a Nonlocally Optimized D-Band Single-Polarized 1-D Anomalous Reflecting RIS
Eiru Morimoto, Atsushi Sanada (Osaka Univ) MW2026-19
Abstract (in Japanese) (See Japanese page) 
(in English) The relationship between reflection efficiency and operational bandwidth of a D-band (140 GHz) anomalous reflection metasurface-based reconfigurable intelligent surface (RIS), enhanced by efficiency optimization and broadband design, is numerically studied. First, for RIS designs with reflection angles of θ_r=30" ",45" ",60" ", and 75" " deg under normal incidence, non-local efficiency optimization utilizing surface waves is applied to improve reflection efficiency. As a result, both unwanted specular and spurious reflections are almost completely suppressed for all designs, and nearly 100% reflection efficiency toward the desired direction is numerically achieved. On the other hand, the trade-off between reflection efficiency and operational bandwidth is also investigated by allowing a certain degradation in efficiency at the design frequency. Numerical results show that a clear trade-off exists between reflection efficiency and bandwidth. The achieved relative bandwidths in which the undesired reflections are less than –10 dB for the designed RISs with θ_r=30" ",45" ",60" ", and 75" " deg are 13.6%, 9.5%, 8.1%, and 4.2%, respectively.
Keyword (in Japanese) (See Japanese page) 
(in English) metasurfaces / anomalous reflection RISs / non-local optimization / / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 24, MW2026-19, pp. 57-61, May 2026.
Paper # MW2026-19 
Date of Issue 2026-05-07 (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 MW2026-19

Conference Information
Committee MW  
Conference Date 2026-05-14 - 2026-05-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Sannomiya convention center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave, etc. 
Paper Information
Registration To MW 
Conference Code 2026-05-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Efficiency and Operational Bandwidth of a Nonlocally Optimized D-Band Single-Polarized 1-D Anomalous Reflecting RIS 
Sub Title (in English)  
Keyword(1) metasurfaces  
Keyword(2) anomalous reflection RISs  
Keyword(3) non-local optimization  
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1st Author's Name Eiru Morimoto  
1st Author's Affiliation The University of Osaka (Osaka Univ)
2nd Author's Name Atsushi Sanada  
2nd Author's Affiliation The University of Osaka (Osaka Univ)
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Speaker Author-1 
Date Time 2026-05-15 14:20:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2026-19 
Volume (vol) vol.126 
Number (no) no.24 
Page pp.57-61 
#Pages 5 
Date of Issue 2026-05-07 (MW) 

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