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Paper Abstract and Keywords
Presentation 2023-12-08 16:50
Analysis of disturbance transmission using modal equivalent circuits for immunity evaluation of high-speed communication equipment
Takumi Kawashima (Kyutech), Kazuya Wakita, Yoshifumi Kaku (DENSO), Tohlu Matushima, Yuki Fukumoto (Kyutech) EMCJ2023-86
Abstract (in Japanese) (See Japanese page) 
(in English) In this report, the electromagnetic noise that enters the communication equipment from the coaxial cable to the in-vehicle communication module is evaluated from the viewpoint of immunity by using a mode conversion equivalent circuit, and the mechanism of mode conversion is clarified. Considering radiated immunity, the applied electromagnetic field induces a common mode in the coaxial cable, which propagates through the cable to the signal line inside the enclosure via the connector.
If the signal lines inside the board are microstrip lines, the difference in equilibrium between the two transmission lines causes a conversion from common mode to normal mode. Furthermore, when the difference in equilibria is small, the parasitic inductance between the ground connections at the connectors is dominant in the mode conversion.
To evaluate these phenomena, a mode-resolved circuit model with an ideal transformer was created, and circuit simulations were conducted using the model and a modal transmission line. The obtained results showed the same trend as that of the 3D electromagnetic feiled simulation.
Keyword (in Japanese) (See Japanese page) 
(in English) degree of equilibrium / Current distribution rate / Immunity / Ideal transformer / 3D electromagnetic field simulation / Circuit Simulation / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 303, EMCJ2023-86, pp. 29-34, Dec. 2023.
Paper # EMCJ2023-86 
Date of Issue 2023-12-01 (EMCJ) 
ISSN Online edition: ISSN 2432-6380
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  
Conference Date 2023-12-08 - 2023-12-08 
Place (in Japanese) (See Japanese page) 
Place (in English) Shizuoka University (Hamamatsu) 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EMCJ 
Conference Code 2023-12-EMCJ 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Analysis of disturbance transmission using modal equivalent circuits for immunity evaluation of high-speed communication equipment 
Sub Title (in English)  
Keyword(1) degree of equilibrium  
Keyword(2) Current distribution rate  
Keyword(3) Immunity  
Keyword(4) Ideal transformer  
Keyword(5) 3D electromagnetic field simulation  
Keyword(6) Circuit Simulation  
1st Author's Name Takumi Kawashima  
1st Author's Affiliation Kyusyu Institute of technology (Kyutech)
2nd Author's Name Kazuya Wakita  
2nd Author's Affiliation DENSO CORPORATION (DENSO)
3rd Author's Name Yoshifumi Kaku  
3rd Author's Affiliation DENSO CORPORATION (DENSO)
4th Author's Name Tohlu Matushima  
4th Author's Affiliation Kyusyu Institute of technology (Kyutech)
5th Author's Name Yuki Fukumoto  
5th Author's Affiliation Kyusyu Institute of technology (Kyutech)
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Speaker Author-1 
Date Time 2023-12-08 16:50:00 
Presentation Time 25 minutes 
Registration for EMCJ 
Paper # EMCJ2023-86 
Volume (vol) vol.123 
Number (no) no.303 
Page pp.29-34 
Date of Issue 2023-12-01 (EMCJ) 

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