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| 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 |
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| 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 |
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| 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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