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oai:niigata-u.repo.nii.ac.jp:00001793
2022-12-15T03:34:37Z
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Simultaneous Measurement of Antenna Gain and Complex Permittivity of Liquid in Near-Field Region Using Weighted Regression
Ishii, Nozomu
5616
Shiga, Hiroki
5617
Ikarashi, Naoto
5618
Sato, Ken-ichi
5619
Hamada, Lira
5620
Watanabe, Soichi
5621
SAR
near-field region
absolute gain
Friis transmission equation
least square method
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.
journal article
電子情報通信学会
2008-06
application/pdf
IEICE transactions on communications
6
E91-B
1831
1837
AA10826261
0916-8516
https://niigata-u.repo.nii.ac.jp/record/1793/files/E91-B_6_1831-1837.pdf
eng
http://doi.org/10.1093/ietcom/e91-b.6.1831
http://search.ieice.org/
Copyright (C) 2008 IEICE
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