| Presentation | 2019-07-19 Proposal of a Measurement Method for Complex Permittivity of a Lossy Liquid Using a Waveguide System Nozomu Ishii, Yuya Aoki, Yuto Shimizu, Tomoaki Nagaoka, Kanako Wake, Soichi Watanabe, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In a standard method for evaluating the specific absorption rate (SAR) of a mobile device, head phantom is formed by the tissue equivalent liquid with a dielectric shell, and SAR is determined by the electric field intensity invading the liquid from the mobile device outside the phantom. The electric field intensity in the liquid is evaluated by the output voltage with an electric field probe. The relationship between the detected electric field intensity and the output voltage in the probe, or, the probe calibration can be evaluated by inserting the probe into a waveguide filled with a tissue equivalent liquid by changing the position of the probe. It is the uncertainty of the complex permittivity measurement of the liquid that largely controls the uncertainty in the SAR measurement and probe calibration. In general, the coaxial probe method is used for measuring complex permittivity of a liquid in the GHz band, but it has large uncertainty because it depends on the reflection measurement from the surface of coaxial end. To suppress the uncertainty of the complex permittivity measurement, it is necessary to introduce a new method with a principle that is different from the coaxial probe method. In this report, to estimate the complex permittivity, we use a waveguide system for the calibration of electric field probe. The fundamental mode of the waveguide is excited on its bottom, and a small dipole antenna is moved from the bottom. The attenuation and phase constants are obtained by using the amplitude and phase of the received signal at the dipole antenna as a function of the distance, and the complex permittivity of the liquid is estimated. In addition, we show some examples of measurement and compare them with the coaxial probe method. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Specific absorption rate / Tissue-equivalent liquid / Waveguide / Complex permittivity measurement |
| Paper # | AP2019-38 |
| Date of Issue | 2019-07-10 (AP) |
| Conference Information | |
| Committee | AP / SANE / SAT |
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| Conference Date | 2019/7/17(3days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tohoku Univ. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Subsurface Electromagnetic Measurements, Sattelite Communication, Radio propagation, Antennas and Propagation |
| Chair | Qiang Chen(Tohoku Univ.) / Akitsugu Nadai(NICT) / Fumihiro Yamashita(NTT) |
| Vice Chair | Satoru Kurokawa(AIST) / Hiroyoshi Yamada(Niigata Univ.) / Makoto Tanaka(Tokai Univ.) / Hisashi Sujikai(NHK) / Hiroyasu Ishikawa(Nihon Univ.) |
| Secretary | Satoru Kurokawa(Mitsubishi Electric) / Hiroyoshi Yamada(Tokyo Univ. of Agric. & Tech.) / Makoto Tanaka(Univ. of Electro-Comm.) / Hisashi Sujikai(Mitsubishi Electric) / Hiroyasu Ishikawa(NTT) |
| Assistant | Michitaka Ameya(AIST) / Ryo Natsuaki(Univ. of Tokyo) / Masato Yamanashi(Mitsubishi Space Software) / Shunichi Futatsumori(ENRI) / Shinobu Nanba(KDDI Research) / Takuya Okura(NICT) |
| Paper Information | |
| Registration To | Technical Committee on Antennas and Propagation / Technical Committee on Space, Aeronautical and Navigational Electronics / Technical Committee on Satellite Telecommunications |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Proposal of a Measurement Method for Complex Permittivity of a Lossy Liquid Using a Waveguide System |
| Sub Title (in English) | |
| Keyword(1) | Specific absorption rate |
| Keyword(2) | Tissue-equivalent liquid |
| Keyword(3) | Waveguide |
| Keyword(4) | Complex permittivity measurement |
| 1st Author's Name | Nozomu Ishii |
| 1st Author's Affiliation | Niigata University(Niigata Univ.) |
| 2nd Author's Name | Yuya Aoki |
| 2nd Author's Affiliation | Niigata University(Niigata Univ.) |
| 3rd Author's Name | Yuto Shimizu |
| 3rd Author's Affiliation | National Institute of Information and Communications Technology(NICT) |
| 4th Author's Name | Tomoaki Nagaoka |
| 4th Author's Affiliation | National Institute of Information and Communications Technology(NICT) |
| 5th Author's Name | Kanako Wake |
| 5th Author's Affiliation | National Institute of Information and Communications Technology(NICT) |
| 6th Author's Name | Soichi Watanabe |
| 6th Author's Affiliation | National Institute of Information and Communications Technology(NICT) |
| Date | 2019-07-19 |
| Paper # | AP2019-38 |
| Volume (vol) | vol.119 |
| Number (no) | AP-120 |
| Page | pp.pp.89-94(AP), |
| #Pages | 6 |
| Date of Issue | 2019-07-10 (AP) |