Computation of the Field Distribution Generated by a Rectangular Aperture in a Four-Layered Lossy Dielectric Medium by Modal Analysis

Shinya MIZOSHIRI; Katsumi ABE; Toshifumi SUGIURA; Shizuo MIZUSHINA

Computation of the Field Distribution Generated by a Rectangular Aperture in a Four-Layered Lossy Dielectric Medium by Modal Analysis

Shinya MIZOSHIRI, Katsumi ABE, Toshifumi SUGIURA, Shizuo MIZUSHINA

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An open-ended rectangular waveguide filled with a dielectric has been used as a contact-type antenna of microwave radiometer for non-invasive measurement of temperature in a biological object. In this application, the thermal radiation emitted by the object is measured as the brightness temperature by the instrument via the antenna. The brightness temperature is related to the physical temperatures in the object through the radiometric weighting function. By virtue of the reciprocity of antenna, the weighting function can be derived from the field distribution induced in the object by the antenna when it is operated in the active mode. In this work, we treat a problem of the rectangular waveguide antenna radiating into a four-layered medium by modal analysis. The results are first compared with those obtained by the FD-TD method to indicate that the results of the two methods are in a good agreement. The operation of an antenna used in a radiometer system in our laboratory is analyzed by this method and the weighting functions at different frequencies are computed, and the results are presented along with discussions on the results.

Publication: IEICE TRANSACTIONS on Communications Vol.E78-B No.6 pp.851-858

Publication Date: 1995/06/25

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Type of Manuscript: Special Section PAPER (Special Issue on Medical Applications of Electromagnetic Techniques)

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Shinya MIZOSHIRI, Katsumi ABE, Toshifumi SUGIURA, Shizuo MIZUSHINA, "Computation of the Field Distribution Generated by a Rectangular Aperture in a Four-Layered Lossy Dielectric Medium by Modal Analysis" in IEICE TRANSACTIONS on Communications, vol. E78-B, no. 6, pp. 851-858, June 1995, doi: .
Abstract: An open-ended rectangular waveguide filled with a dielectric has been used as a contact-type antenna of microwave radiometer for non-invasive measurement of temperature in a biological object. In this application, the thermal radiation emitted by the object is measured as the brightness temperature by the instrument via the antenna. The brightness temperature is related to the physical temperatures in the object through the radiometric weighting function. By virtue of the reciprocity of antenna, the weighting function can be derived from the field distribution induced in the object by the antenna when it is operated in the active mode. In this work, we treat a problem of the rectangular waveguide antenna radiating into a four-layered medium by modal analysis. The results are first compared with those obtained by the FD-TD method to indicate that the results of the two methods are in a good agreement. The operation of an antenna used in a radiometer system in our laboratory is analyzed by this method and the weighting functions at different frequencies are computed, and the results are presented along with discussions on the results.
URL: https://global.ieice.org/en_transactions/communications/10.1587/e78-b_6_851/_p

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@ARTICLE{e78-b_6_851,
author={Shinya MIZOSHIRI, Katsumi ABE, Toshifumi SUGIURA, Shizuo MIZUSHINA, },
journal={IEICE TRANSACTIONS on Communications},
title={Computation of the Field Distribution Generated by a Rectangular Aperture in a Four-Layered Lossy Dielectric Medium by Modal Analysis},
year={1995},
volume={E78-B},
number={6},
pages={851-858},
abstract={An open-ended rectangular waveguide filled with a dielectric has been used as a contact-type antenna of microwave radiometer for non-invasive measurement of temperature in a biological object. In this application, the thermal radiation emitted by the object is measured as the brightness temperature by the instrument via the antenna. The brightness temperature is related to the physical temperatures in the object through the radiometric weighting function. By virtue of the reciprocity of antenna, the weighting function can be derived from the field distribution induced in the object by the antenna when it is operated in the active mode. In this work, we treat a problem of the rectangular waveguide antenna radiating into a four-layered medium by modal analysis. The results are first compared with those obtained by the FD-TD method to indicate that the results of the two methods are in a good agreement. The operation of an antenna used in a radiometer system in our laboratory is analyzed by this method and the weighting functions at different frequencies are computed, and the results are presented along with discussions on the results.},
keywords={},
doi={},
ISSN={},
month={June},}

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TY - JOUR
TI - Computation of the Field Distribution Generated by a Rectangular Aperture in a Four-Layered Lossy Dielectric Medium by Modal Analysis
T2 - IEICE TRANSACTIONS on Communications
SP - 851
EP - 858
AU - Shinya MIZOSHIRI
AU - Katsumi ABE
AU - Toshifumi SUGIURA
AU - Shizuo MIZUSHINA
PY - 1995
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E78-B
IS - 6
JA - IEICE TRANSACTIONS on Communications
Y1 - June 1995
AB - An open-ended rectangular waveguide filled with a dielectric has been used as a contact-type antenna of microwave radiometer for non-invasive measurement of temperature in a biological object. In this application, the thermal radiation emitted by the object is measured as the brightness temperature by the instrument via the antenna. The brightness temperature is related to the physical temperatures in the object through the radiometric weighting function. By virtue of the reciprocity of antenna, the weighting function can be derived from the field distribution induced in the object by the antenna when it is operated in the active mode. In this work, we treat a problem of the rectangular waveguide antenna radiating into a four-layered medium by modal analysis. The results are first compared with those obtained by the FD-TD method to indicate that the results of the two methods are in a good agreement. The operation of an antenna used in a radiometer system in our laboratory is analyzed by this method and the weighting functions at different frequencies are computed, and the results are presented along with discussions on the results.
ER -