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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.

- Publication
- IEICE TRANSACTIONS on Communications Vol.E91-B No.6 pp.1831-1837

- Publication Date
- 2008/06/01

- Publicized

- Online ISSN
- 1745-1345

- DOI
- 10.1093/ietcom/e91-b.6.1831

- Type of Manuscript
- Special Section PAPER (Special Section on 2007 International Symposium on Antennas and Propagation)

- Category
- Measurements

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Nozomu ISHII, Hiroki SHIGA, Naoto IKARASHI, Ken-ichi SATO, Lira HAMADA, Soichi WATANABE, "Simultaneous Measurement of Antenna Gain and Complex Permittivity of Liquid in Near-Field Region Using Weighted Regression" in IEICE TRANSACTIONS on Communications,
vol. E91-B, no. 6, pp. 1831-1837, June 2008, doi: 10.1093/ietcom/e91-b.6.1831.

Abstract: 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.

URL: https://global.ieice.org/en_transactions/communications/10.1093/ietcom/e91-b.6.1831/_p

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@ARTICLE{e91-b_6_1831,

author={Nozomu ISHII, Hiroki SHIGA, Naoto IKARASHI, Ken-ichi SATO, Lira HAMADA, Soichi WATANABE, },

journal={IEICE TRANSACTIONS on Communications},

title={Simultaneous Measurement of Antenna Gain and Complex Permittivity of Liquid in Near-Field Region Using Weighted Regression},

year={2008},

volume={E91-B},

number={6},

pages={1831-1837},

abstract={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.},

keywords={},

doi={10.1093/ietcom/e91-b.6.1831},

ISSN={1745-1345},

month={June},}

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TY - JOUR

TI - Simultaneous Measurement of Antenna Gain and Complex Permittivity of Liquid in Near-Field Region Using Weighted Regression

T2 - IEICE TRANSACTIONS on Communications

SP - 1831

EP - 1837

AU - Nozomu ISHII

AU - Hiroki SHIGA

AU - Naoto IKARASHI

AU - Ken-ichi SATO

AU - Lira HAMADA

AU - Soichi WATANABE

PY - 2008

DO - 10.1093/ietcom/e91-b.6.1831

JO - IEICE TRANSACTIONS on Communications

SN - 1745-1345

VL - E91-B

IS - 6

JA - IEICE TRANSACTIONS on Communications

Y1 - June 2008

AB - 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.

ER -