Simultaneous Measurement of Antenna Gain and Complex Permittivity of Liquid in Near-Field Region Using Weighted Regression
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概要
- 論文の詳細を見る
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 the 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 the near-field region. In this paper, the method of weighted least squares is introduced to reduce the effect of the noise in the measurement system when the gain of the antenna operated in the liquid is determined by the curve-fitting technique. And we examine how to choose the fitting range to reduce the uncertainty of the estimated gain.
- （社）電子情報通信学会の論文
- 2008-06-01
著者
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Watanabe Soichi
NICT
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Hamada Lira
National Inst. Of Information And Communications Technol. Koganei‐shi Jpn
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WATANABE Soichi
National Institute of Information and Communications Technology
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ISHII Nozomu
Faculty of Engineering, Niigata University
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SHIGA Hiroki
Graduate School of Science and Technology, Niigata University
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IKARASHI Naoto
Graduate School of Science and Technology, Niigata University
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SATO Ken-ichi
NTT Advanced Technology
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Shiga Hiroki
Graduate School Of Science And Technology Niigata University
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Ishii Nozomu
National Inst. Of Information And Communications Technol. Koganei‐shi Jpn
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Ishii Nozomu
Faculty Of Engineering Niigata University
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Sato Ken‐ichi
Nagoya Univ. Nagoya Jpn
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Hamada Lira
National Inst. Of Information And Communications Technol. (nict) Koganei‐shi Jpn
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Ishii Nozomu
Faculty Of Engineering The Niigata University
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SATO Ken-ichi
the NTT Advanced Technology
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