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A Method of Measuring Gain in Liquids Based on the Friis Transmission Formula in the Near-Field Region(Measurements,<Special Section>2006 International Symposium on Antennas and Propagation)
http://hdl.handle.net/10191/25749
http://hdl.handle.net/10191/2574921fbbe34-2364-4c34-8652-589434e37dca
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
110007541051.pdf (1.3 MB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2014-02-25 | |||||
| タイトル | ||||||
| タイトル | A Method of Measuring Gain in Liquids Based on the Friis Transmission Formula in the Near-Field Region(Measurements,<Special Section>2006 International Symposium on Antennas and Propagation) | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Friis transmission formula | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | SAR probe calibration | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | conducting medium | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Fresnel approximation | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | far-field gain | |||||
| 資源タイプ | ||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||
| タイプ | journal article | |||||
| 著者 |
Ishii, Nozomu
× Ishii, Nozomu× Akagawa, Takuhei× Sato, Ken-ichi× Hamada, Lira× Watanabe, Soichi |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | In the 300MHz to 3GHz range, probes used to measure specific absorption rate (SAR) of mobile communication devices are usually calibrated using a rectangular waveguide filled with tissue-equivalent liquid. Above 3GHz, however, this conventional calibration can be inaccurate because the diameter of the probe is comparable to the cross-sectional dimension of the waveguide. Therefore, an alternative method of SAR probe calibration based on another principle was needed and has been developed by the authors. In the proposed calibration method, the gain of the reference antenna in the liquid is first evaluated using the two-antenna method based on the Friis transmission formula in the conducting medium. Then the electric field intensity radiated by the reference antenna is related to the output voltage of the SAR probe at a given point in the liquid. However, the fields are significantly reduced in the liquid, and the gain is impossible to calibrate in the far-field region. To overcome this difficulty, the Friis transmission formula in the conducting medium must be extended to the near-field region. Here, we report results of simulations and experiments on estimated gain based on the extended Friis transmission formula, which holds in the near-field region, and test the validity of the new formula. | |||||
| 言語 | en | |||||
| 書誌情報 |
en : IEICE transactions on communications 巻 E90-B, 号 9, p. 2401-2407, 発行日 2007-09 |
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| 出版者 | ||||||
| 出版者 | 電子情報通信学会 | |||||
| 言語 | ja | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0916-8516 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AA10826261 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | http://doi.org/10.1093/ietcom/e90-b.9.2401 | |||||
| 権利 | ||||||
| 権利情報 | Copyright (C) 2007 IEICE | |||||
| 権利 | ||||||
| 権利情報 | 本文データは学協会の許諾に基づきCiNiiから複製したものである | |||||
| 出版タイプ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| 著者版フラグ | ||||||
| 値 | publisher | |||||
| 異版である | ||||||
| 関連タイプ | isVersionOf | |||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://ci.nii.ac.jp/naid/110007541051 | |||||
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Ishii, Nozomu, Akagawa, Takuhei, Sato, Ken-ichi, Hamada, Lira, Watanabe, Soichi, 2007, A Method of Measuring Gain in Liquids Based on the Friis Transmission Formula in the Near-Field Region(Measurements,<Special Section>2006 International Symposium on Antennas and Propagation): 電子情報通信学会, 2401–2407 p.
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