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Paper Abstract and Keywords
Presentation 2026-05-21 13:30
Study on a Metasurface for Large-Angle Anomalous Reflection of Normally Incident Waves
Hibiki Kagami, Takumi Yoneda, Daisuke Kitayama, Adam Pander, Tomoki Murakami, Riichi Kudo, Hiroyuki Takahashi (NTT) AP2026-17
Abstract (in Japanese) (See Japanese page) 
(in English) In millimeter-wave and sub-millimeter-wave communications, diffraction effects become negligible due to the short wavelength, leading to increased blockage loss and degraded communication quality, particularly in indoor non-line-of-sight (NLOS) environments. In scenarios such as corridor corners and wall obstructions, where blockage frequently occurs, techniques to guide electromagnetic waves beyond obstacles are required. In this paper, we focus on a reflective metasurface for controlling the reflection direction when installed on a wall. The proposed metasurface is designed and fabricated to reflect waves at normal incidence toward horizontal directions (75–90°). Measurement results at 28 GHz demonstrate the intended large-angle reflection characteristics and improvement in received signal strength under NLOS conditions, indicating the effectiveness of the proposed approach for enhancing indoor radio coverage.
Keyword (in Japanese) (See Japanese page) 
(in English) metasurface / Propagation control / Coverage expansion / / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 32, AP2026-17, pp. 1-6, May 2026.
Paper # AP2026-17 
Date of Issue 2026-05-14 (AP) 
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 AP2026-17

Conference Information
Committee AP  
Conference Date 2026-05-21 - 2026-05-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagasaki University Technology Innovation Campus 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Antennas and Propagation 
Paper Information
Registration To AP 
Conference Code 2026-05-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Study on a Metasurface for Large-Angle Anomalous Reflection of Normally Incident Waves 
Sub Title (in English)  
Keyword(1) metasurface  
Keyword(2) Propagation control  
Keyword(3) Coverage expansion  
Keyword(4)  
Keyword(5)  
Keyword(6)  
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1st Author's Name Hibiki Kagami  
1st Author's Affiliation NTT, Inc. (NTT)
2nd Author's Name Takumi Yoneda  
2nd Author's Affiliation NTT, Inc. (NTT)
3rd Author's Name Daisuke Kitayama  
3rd Author's Affiliation NTT, Inc. (NTT)
4th Author's Name Adam Pander  
4th Author's Affiliation NTT, Inc. (NTT)
5th Author's Name Tomoki Murakami  
5th Author's Affiliation NTT, Inc. (NTT)
6th Author's Name Riichi Kudo  
6th Author's Affiliation NTT, Inc. (NTT)
7th Author's Name Hiroyuki Takahashi  
7th Author's Affiliation NTT, Inc. (NTT)
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Speaker Author-1 
Date Time 2026-05-21 13:30:00 
Presentation Time 25 minutes 
Registration for AP 
Paper # AP2026-17 
Volume (vol) vol.126 
Number (no) no.32 
Page pp.1-6 
#Pages 6 
Date of Issue 2026-05-14 (AP) 

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