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Paper Abstract and Keywords
Presentation 2026-09-10 09:30
Fundamental Study of S-Parameter Analysis for the Lossy-Cylindrical-Dielectric-Loaded Rectangular Waveguide via Mode-Matching and Generalized Scattering Matrix Methods
Kouji Shibata (Hachinohe Inst. of Tech.) MW2026-68
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes a simple, root-finding-free mode-matching method based on a one-dimensional (1-D) Q-matrix approach combined with the generalized scattering matrix (GSM) technique. By rigorously expanding the transverse discontinuous relative permittivity distribution into a matrix formulation using the sinusoidal eigenfunctions of a hollow waveguide, the transverse Helmholtz equation is successfully reduced to a standard linear matrix eigenvalue problem. This formulation completely eliminates the need for iterative root-finding, allowing all complex propagation constants and corresponding mode amplitudes to be extracted simultaneously and uniquely through a single algebraic operation. Unlike existing multidimensional projection methods that suffer from dimensional explosion, the proposed 1-D formulation significantly reduces the computational matrix size while perfectly preserving numerical robustness via deterministic mode sorting under high-loss conditions. The validity, high computational efficiency, and numerical stability of the proposed method are verified through S-parameter calculations for rectangular dielectric posts inside a WR-90 waveguide over the 8–18 GHz range, demonstrating excellent agreement with three-dimensional finite-element method (3-D FEM) results.
Keyword (in Japanese) (See Japanese page) 
(in English) Microwave / Waveguide / Dielectric Post / Dielectric Slab / Mode-Matching Technique / Generalized Scattering Matrix / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 173, MW2026-68, pp. 1-5, Sept. 2026.
Paper # MW2026-68 
Date of Issue 2026-09-03 (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 MW2026-68

Conference Information
Committee MW AP  
Conference Date 2026-09-09 - 2026-09-11 
Place (in Japanese) (See Japanese page) 
Place (in English) Ishikawa Prefectural Library 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave, Millimeter wave, Radio propagation, Antennas and Propagation 
Paper Information
Registration To MW 
Conference Code 2026-09-MW-AP 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Fundamental Study of S-Parameter Analysis for the Lossy-Cylindrical-Dielectric-Loaded Rectangular Waveguide via Mode-Matching and Generalized Scattering Matrix Methods 
Sub Title (in English)  
Keyword(1) Microwave  
Keyword(2) Waveguide  
Keyword(3) Dielectric Post  
Keyword(4) Dielectric Slab  
Keyword(5) Mode-Matching Technique  
Keyword(6) Generalized Scattering Matrix  
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Keyword(8)  
1st Author's Name Kouji Shibata  
1st Author's Affiliation Hachinohe Institute of Technology (Hachinohe Inst. of Tech.)
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Speaker Author-1 
Date Time 2026-09-10 09:30:00 
Presentation Time 20 minutes 
Registration for MW 
Paper # MW2026-68 
Volume (vol) vol.126 
Number (no) no.173 
Page pp.1-5 
#Pages 5 
Date of Issue 2026-09-03 (MW) 

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