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Paper Abstract and Keywords
Presentation 2026-02-19 15:45
[Invited Lecture] A Study and Field Evaluation of the Vertical-Plane Directivity of Transmit Array Antennas for Outdoor mmWave Band Base Stations
Shumpei Tabuchi, Toshiki Hozen, Kazuma Tomimoto, Ryo Yamaguchi (Softbank), Keisuke Arai, Toshiki Sayama, Osamu Kagaya (AGC) AP2025-214
Abstract (in Japanese) (See Japanese page) 
(in English) In the mm-wave band of 5th generation (5G) mobile communication systems, antenna configurations capable of beam steering and MIMO communication are required to compensate for high propagation loss and to provide wide-area coverage. Although large-scale antenna arrays are widely used, the required number of precoders increases circuit complexity and power consumption. This paper focuses on a transmit array antenna composed of a primary radiator and a metasurface-based transmissive plate. Beam steering is performed in the horizontal direction using the primary radiator, while a fixed cosecant-squared radiation pattern is applied in the vertical direction. This configuration enables a reduction in the number of precoders while maintaining effective area coverage. The effectiveness of the proposed antenna is evaluated through simulations and outdoor experiments in a hotspot environment.
Keyword (in Japanese) (See Japanese page) 
(in English) mmWave Band / Base Station Antenna / Transmit Array Antenna / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 357, AP2025-214, pp. 26-30, Feb. 2026.
Paper # AP2025-214 
Date of Issue 2026-02-12 (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 AP2025-214

Conference Information
Committee AP  
Conference Date 2026-02-19 - 2026-02-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagoya Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Industrial Session, Antennas and Propagation 
Paper Information
Registration To AP 
Conference Code 2026-02-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study and Field Evaluation of the Vertical-Plane Directivity of Transmit Array Antennas for Outdoor mmWave Band Base Stations 
Sub Title (in English)  
Keyword(1) mmWave Band  
Keyword(2) Base Station Antenna  
Keyword(3) Transmit Array Antenna  
Keyword(4)  
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1st Author's Name Shumpei Tabuchi  
1st Author's Affiliation Softbank Corp. (Softbank)
2nd Author's Name Toshiki Hozen  
2nd Author's Affiliation Softbank Corp. (Softbank)
3rd Author's Name Kazuma Tomimoto  
3rd Author's Affiliation Softbank Corp. (Softbank)
4th Author's Name Ryo Yamaguchi  
4th Author's Affiliation Softbank Corp. (Softbank)
5th Author's Name Keisuke Arai  
5th Author's Affiliation AGC Inc. (AGC)
6th Author's Name Toshiki Sayama  
6th Author's Affiliation AGC Inc. (AGC)
7th Author's Name Osamu Kagaya  
7th Author's Affiliation AGC Inc. (AGC)
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Speaker Author-1 
Date Time 2026-02-19 15:45:00 
Presentation Time 25 minutes 
Registration for AP 
Paper # AP2025-214 
Volume (vol) vol.125 
Number (no) no.357 
Page pp.26-30 
#Pages 5 
Date of Issue 2026-02-12 (AP) 

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