| Presentation | 2012-03-16 Study on Relationship between SVSWR and EMI Measurement above 1 GHz : CISPR22 (2008) requirement Toshihiro NAGAI, Norio HAMA, Atsushi SHINOZAKI, Junichi TERASHIMA, Toshiyuki KARUBE, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(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 RE 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) |
| Keyword(in English) | CISPR22 / SVSWR / EMI / Above 1 GHz |
| Paper # | EMCJ2011-140 |
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| Conference Information | |
| Committee | EMCJ |
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| Conference Date | 2012/3/9(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Electromagnetic Compatibility (EMCJ) |
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| Language | JPN |
| 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 1 GHz : CISPR22 (2008) requirement |
| Sub Title (in English) | |
| Keyword(1) | CISPR22 |
| Keyword(2) | SVSWR |
| Keyword(3) | EMI |
| Keyword(4) | Above 1 GHz |
| 1st Author's Name | Toshihiro NAGAI |
| 1st Author's Affiliation | Seiko Epson Corporation Hirooka office() |
| 2nd Author's Name | Norio HAMA |
| 2nd Author's Affiliation | Seiko Epson Corporation Hirooka office |
| 3rd Author's Name | Atsushi SHINOZAKI |
| 3rd Author's Affiliation | Seiko Epson Corporation Hirooka office |
| 4th Author's Name | Junichi TERASHIMA |
| 4th Author's Affiliation | Nagano Prefecture General Industrial Technology Center |
| 5th Author's Name | Toshiyuki KARUBE |
| 5th Author's Affiliation | Nagano Prefecture General Industrial Technology Center |
| Date | 2012-03-16 |
| Paper # | EMCJ2011-140 |
| Volume (vol) | vol.111 |
| Number (no) | 492 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |