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Paper Abstract and Keywords
Presentation 2012-03-16 14:25
Study on relationship between SVSWR and EMI measurement above 1GHz -- CISPR22 (2008) requirement --
Toshihiro Nagai, Norio Hama, Atsushi Shinozaki (SEIKO EPSON), Junichi Terashima, Toshiyuki Karube (Nagano Prefecture General Industrial Technology Center) EMCJ2011-140
Abstract (in Japanese) (See Japanese page) 
(in English) CISPR22 specifies radiated emission measurement in 1 to 6 GHz for information technology equipment. The measurement site above 1 GHz is assumed as a free space, and required that criterion of SVSWR (Site Voltage Standing Wave Ratio) specified in CISPR16-1-4 meets SVSWR  6 dB. Studies of methods and uncertainties of SVSWR validation have been reported. However, the relationship between SVSWR and radiated emission measurement is still unclear. In this contribution, we conducted SVSWR measurement and radiated emission measurement of two equipments by changing RF absorber area on the metal ground plane at an open area test site and a semi-anechoic chamber. As a result, we found that SVSWR and emission levels of a comb generator with a mini-biconical antenna have linear relationships both horizontal and vertical polarizations when the receiving antenna is scanned and the maximum emission level is searched. Extrapolating from the maximum gradient of regression lines, SVSWR = 6 dB corresponds to a variation of emission level of 1.9 dB for horizontal polarization and 2.0 dB for vertical, which are reasonable values compared to those of the reference. On the other hand, we found that SVSWR and emission levels of a desktop PC do not have clear relationships. In addition, the deviation of emission levels tends to be smaller when SVSWR is lower, although, the deviation could be converged if the maximum emission level is searched by scanning the receiving antenna. The evaluation of the measurement site above 1 GHz based on site attenuation would be a future work.
Keyword (in Japanese) (See Japanese page) 
(in English) CISPR22 / SVSWR / EMI / Above 1 GHz / / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 492, EMCJ2011-140, pp. 61-66, March 2012.
Paper # EMCJ2011-140 
Date of Issue 2012-03-09 (EMCJ) 
ISSN Print edition: ISSN 0913-5685    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 EMCJ2011-140

Conference Information
Committee EMCJ ITE-BCT  
Conference Date 2012-03-16 - 2012-03-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Broadcast, EMC, etc. 
Paper Information
Registration To EMCJ 
Conference Code 2012-03-EMCJ-BCT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Study on relationship between SVSWR and EMI measurement above 1GHz 
Sub Title (in English) CISPR22 (2008) requirement 
Keyword(1) CISPR22  
Keyword(2) SVSWR  
Keyword(3) EMI  
Keyword(4) Above 1 GHz  
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1st Author's Name Toshihiro Nagai  
1st Author's Affiliation SEIKO EPSON Corporation (SEIKO EPSON)
2nd Author's Name Norio Hama  
2nd Author's Affiliation SEIKO EPSON Corporation (SEIKO EPSON)
3rd Author's Name Atsushi Shinozaki  
3rd Author's Affiliation SEIKO EPSON Corporation (SEIKO EPSON)
4th Author's Name Junichi Terashima  
4th Author's Affiliation Nagano Prefecture General Industrial Technology Center (Nagano Prefecture General Industrial Technology Center)
5th Author's Name Toshiyuki Karube  
5th Author's Affiliation Nagano Prefecture General Industrial Technology Center (Nagano Prefecture General Industrial Technology Center)
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Speaker Author-1 
Date Time 2012-03-16 14:25:00 
Presentation Time 25 minutes 
Registration for EMCJ 
Paper # EMCJ2011-140 
Volume (vol) vol.111 
Number (no) no.492 
Page pp.61-66 
#Pages 6 
Date of Issue 2012-03-09 (EMCJ) 

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