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Paper Abstract and Keywords
Presentation 2025-12-19 10:55
basic study for common mode estimation method from substrate model with discontinuity of signal line structure
Rin Koike, Jyuntarou Kurashina (NIT,Nagano College), Hayato Ide, Taiki Kitazawa, Fujimoto Daisuke, Yu-ichi Hayashi (NAIST), Takashi Kasuga (NIT,Nagano College) EMCJ2025-89
Abstract (in Japanese) (See Japanese page) 
(in English) Printed circuit boards and cables are connected through connectors. However, even if the characteristic impedance of each line is consistent, discontinuities in the line structure can cause signal reflection and radiation. To reduce Signal Integrity (SI) degradation and EMI, it is necessary to consider the board-connector-cable structure. The purpose of this study is to develop a system to analyze electric field emissions from boards interconnected by connectors. We use near-field analysis using the finite-difference time-domain (FDTD) method and a far-field estimation method using near-far transformation. We confirmed that the far-field estimation method was accurate using a half-wavelength dipole antenna as a wave source. We also investigated conditions for reducing the conversion data while maintaining calculation accuracy to reduce the amount of analysis required for far-field estimation. We calculated common-mode radiation from a microstrip line and examined the correlation between common-mode current and far-field. Finally, we analyzed the radiated electric field from a board model interconnected by a differential line and a USB connector.
Keyword (in Japanese) (See Japanese page) 
(in English) Far field / common-mode / FDTD analysis method / USB connector / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 305, EMCJ2025-89, pp. 19-24, Dec. 2025.
Paper # EMCJ2025-89 
Date of Issue 2025-12-12 (EMCJ) 
ISSN Online edition: ISSN 2432-6380
Copyright
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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)
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Conference Information
Committee EMCJ IEE-EMC  
Conference Date 2025-12-19 - 2025-12-19 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EMCJ 
Conference Code 2025-12-EMCJ-EMC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) basic study for common mode estimation method from substrate model with discontinuity of signal line structure 
Sub Title (in English)  
Keyword(1) Far field  
Keyword(2) common-mode  
Keyword(3) FDTD analysis method  
Keyword(4) USB connector  
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1st Author's Name Rin Koike  
1st Author's Affiliation National Institute of Technology, Nagano College (NIT,Nagano College)
2nd Author's Name Jyuntarou Kurashina  
2nd Author's Affiliation National Institute of Technology, Nagano College (NIT,Nagano College)
3rd Author's Name Hayato Ide  
3rd Author's Affiliation Nara Institute of Science and Technology (NAIST)
4th Author's Name Taiki Kitazawa  
4th Author's Affiliation Nara Institute of Science and Technology (NAIST)
5th Author's Name Fujimoto Daisuke  
5th Author's Affiliation Nara Institute of Science and Technology (NAIST)
6th Author's Name Yu-ichi Hayashi  
6th Author's Affiliation Nara Institute of Science and Technology (NAIST)
7th Author's Name Takashi Kasuga  
7th Author's Affiliation National Institute of Technology, Nagano College (NIT,Nagano College)
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Speaker Author-1 
Date Time 2025-12-19 10:55:00 
Presentation Time 25 minutes 
Registration for EMCJ 
Paper # EMCJ2025-89 
Volume (vol) vol.125 
Number (no) no.305 
Page pp.19-24 
#Pages 6 
Date of Issue 2025-12-12 (EMCJ) 

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