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Paper Abstract and Keywords
Presentation 2026-02-20 10:45
Design of a Low-Grating-Lobe SIW Endfire Interpolating Fed Phased Array in 300 GHz Band
Daisuke Sakai, Yoshiki Sugimoto, Kunio Sakakibara (NIT), Yoshihiro Kanasaki (PSNRD), Yuji Tanaka, Nobuyoshi Kikuma (NIT) AP2025-219
Abstract (in Japanese) (See Japanese page) 
(in English) An SIW endfire antenna phased array with interpolating element was designed in 300-GHz band. Endfire antennas have narrow bandwidth because impedance matching at the radiating aperture is difficult. Each array element antenna achieves broad bandwidth by incorporating a stepped impedance matching structure inside the SIW, taking the advantage of multilayer substrate. In 300 GHz band, the RF feeding circuit size limits dense element spacing, causing grating-lobes. In proposed antenna, interpolating fed technique is employed, in which the interpolating element is excited by coupling from the feeding elements and radio waves are radiated both from the feeding and interpolating elements. By coupling to the interpolating element, radio waves are radiated not only from the feeding elements but also from the interpolating element. This effectively halves the radiating element spacing and suppresses grating-lobes even when the feeding elements spacing exceeds one wavelength in free space.
Keyword (in Japanese) (See Japanese page) 
(in English) Sub-Terahertz Band / Substrate-Integrated Waveguide (SIW) / Endfire Antennas / Phased Arrays / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 357, AP2025-219, pp. 52-56, Feb. 2026.
Paper # AP2025-219 
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 AP2025-219

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) Design of a Low-Grating-Lobe SIW Endfire Interpolating Fed Phased Array in 300 GHz Band 
Sub Title (in English)  
Keyword(1) Sub-Terahertz Band  
Keyword(2) Substrate-Integrated Waveguide (SIW)  
Keyword(3) Endfire Antennas  
Keyword(4) Phased Arrays  
Keyword(5)  
Keyword(6)  
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Keyword(8)  
1st Author's Name Daisuke Sakai  
1st Author's Affiliation Nagoya Institute of Technology (NIT)
2nd Author's Name Yoshiki Sugimoto  
2nd Author's Affiliation Nagoya Institute of Technology (NIT)
3rd Author's Name Kunio Sakakibara  
3rd Author's Affiliation Nagoya Institute of Technology (NIT)
4th Author's Name Yoshihiro Kanasaki  
4th Author's Affiliation Panasonic System Networks R&D Lab. Co., Ltd. (PSNRD)
5th Author's Name Yuji Tanaka  
5th Author's Affiliation Nagoya Institute of Technology (NIT)
6th Author's Name Nobuyoshi Kikuma  
6th Author's Affiliation Nagoya Institute of Technology (NIT)
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Speaker Author-1 
Date Time 2026-02-20 10:45:00 
Presentation Time 25 minutes 
Registration for AP 
Paper # AP2025-219 
Volume (vol) vol.125 
Number (no) no.357 
Page pp.52-56 
#Pages 5 
Date of Issue 2026-02-12 (AP) 

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