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Paper Abstract and Keywords
Presentation 2011-12-09 09:05
Characteristics of FM-Band Cross-Talks between Two Parallel Signal Traces on Printed Circuit Boards with Separated Ground Pattenrs for Vehicles
Michihira Iida (DENSO/NIT), Tsuyoshi Maeno (DENSO), Jianqing Wang, Osamu Fujiwara (NIT) EMCJ2011-96
Abstract (in Japanese) (See Japanese page) 
(in English) It is well known that electromagnetic disturbances in vehicle-mounted radios are mainly caused by conducted noise currents flowing through wiring-harnesses from vehicle-mounted printed circuit boards (PCBs) with common slitting ground patterns. To suppress these kinds of noise currents from PCBs, we previously measured them for simple two-layer PCBs with two parallel signal traces and slitting or non-slitting ground patterns. The results revealed that making slits with open ends on the ground patterns in parallel with the traces can reduce the conducted noise currents. Also it was found that a contributory factor for FM-band cross-talk reduction is the reduction of mutual inductance between the two parallel traces. Moreover, it was also interesting to note that the noise currents from PCBs can rather be suppressed despite the small size of the return ground. We then performed further FDTD simulation using eight simple two-layer PCB models in which the ground patterns were divided into two parts with different widths. The results showed that the cross-talk cannot always be reduced by widening the width of ground patters. In this study, to confirm the above findings, we made actual PCB samples with the same specification as the models used in the previous FDTD simulation, and measured cross-talks between the two parallel signal traces with respect to the different widths of ground patterns. As a result, we confirmed that the measured results agree with the FDTD simulation, and also that the cross-talks have the smallest values at specific spaces between the divided ground patterns. In order to clarify the latter result, we calculated cross-talks from a simplified equivalent circuit model consisting of inductances for the traces and ground patterns, and found that the circuit model can qualitatively explain the dependence of cross-talks on ground pattern width. The minimum reduction mechanism was found to come from the fact that a specific width of the ground pattern provides the smallest interlinking magnetic flux between the trace and the ground pattern.
Keyword (in Japanese) (See Japanese page) 
(in English) vehicle-mounted PCB / divided ground / cross-talks between two parallel signal traces / mutual inductance / / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 335, EMCJ2011-96, pp. 1-6, Dec. 2011.
Paper # EMCJ2011-96 
Date of Issue 2011-12-02 (EMCJ) 
ISSN Print edition: ISSN 0913-5685    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 2011-12-09 - 2011-12-09 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagoya Inst. of Tech. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Power electronics, Biomedical, EMC, etc. 
Paper Information
Registration To EMCJ 
Conference Code 2011-12-EMCJ-EMC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Characteristics of FM-Band Cross-Talks between Two Parallel Signal Traces on Printed Circuit Boards with Separated Ground Pattenrs for Vehicles 
Sub Title (in English)  
Keyword(1) vehicle-mounted PCB  
Keyword(2) divided ground  
Keyword(3) cross-talks between two parallel signal traces  
Keyword(4) mutual inductance  
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1st Author's Name Michihira Iida  
1st Author's Affiliation DENSO CORPORATION/Nagoya Institute of Technology (DENSO/NIT)
2nd Author's Name Tsuyoshi Maeno  
2nd Author's Affiliation DENSO CORPORATION (DENSO)
3rd Author's Name Jianqing Wang  
3rd Author's Affiliation Nagoya Institute of Technology (NIT)
4th Author's Name Osamu Fujiwara  
4th Author's Affiliation Nagoya Institute of Technology (NIT)
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Speaker Author-1 
Date Time 2011-12-09 09:05:00 
Presentation Time 20 minutes 
Registration for EMCJ 
Paper # EMCJ2011-96 
Volume (vol) vol.111 
Number (no) no.335 
Page pp.1-6 
#Pages 6 
Date of Issue 2011-12-02 (EMCJ) 

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