| Presentation | 2007-05-25 Uncertainty of Simultaneous Measurement of Antenna Gain in the Liquid and Its Dielectric Property Including the Contribution of the Fresnel-field Hiroki SHIGA, Naoto IKARASHI, Nozomu ISHII, Ken-ichi SATO, Lira HAMADA, Soichi WATANABE, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | As a technique for calibrating electric-field probes used in standardized SAR (Specific Absorption Rate) assessment, we have studied the technique using the Friis transmission formula in the tissue equivalent liquid. It is difficult to measure power transmission between two reference antennas in far-field region due to large attenuation in the liquid. This means that the conventional Friis transmission formula cannot be applied to our measurement so that we developed an extension of this formula that is valid in Fresnel-field region. In this report, the method of weighted least square is introduced to reduce the contribution of noise in the measurement system when the gain of the antenna in the liquid is determined by curve-fitting. And we examine how to choice the fitting range to reduce the uncertainty of the estimated gain. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | SAR / Fresnel-field region / absolute gain / Friis transmission equation / least square method |
| Paper # | EMCJ2007-10 |
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| Conference Information | |
| Committee | EMCJ |
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| Conference Date | 2007/5/18(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
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| Vice Chair | |
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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) | Uncertainty of Simultaneous Measurement of Antenna Gain in the Liquid and Its Dielectric Property Including the Contribution of the Fresnel-field |
| Sub Title (in English) | |
| Keyword(1) | SAR |
| Keyword(2) | Fresnel-field region |
| Keyword(3) | absolute gain |
| Keyword(4) | Friis transmission equation |
| Keyword(5) | least square method |
| 1st Author's Name | Hiroki SHIGA |
| 1st Author's Affiliation | Graduate School of Science and Technology, Niigata University() |
| 2nd Author's Name | Naoto IKARASHI |
| 2nd Author's Affiliation | Graduate School of Science and Technology, Niigata University |
| 3rd Author's Name | Nozomu ISHII |
| 3rd Author's Affiliation | Faculty of Engineering, Niigata University:National Institute of Information and Communications Technology |
| 4th Author's Name | Ken-ichi SATO |
| 4th Author's Affiliation | NTT Advanced Technology |
| 5th Author's Name | Lira HAMADA |
| 5th Author's Affiliation | National Institute of Information and Communications Technology |
| 6th Author's Name | Soichi WATANABE |
| 6th Author's Affiliation | National Institute of Information and Communications Technology |
| Date | 2007-05-25 |
| Paper # | EMCJ2007-10 |
| Volume (vol) | vol.107 |
| Number (no) | 68 |
| Page | pp.pp.- |
| #Pages | 5 |
| Date of Issue | |