IEICE TRANSACTIONS on Communications
Attenuation Characteristics of the SAR in a COST244 Phantom with Different EM Source Locations and Sizes
Summary :
This paper addresses the variation of the attenuation characteristics of the Specific Absorption Rate (SAR) in a lossy medium as a function of the distance between an antenna and the medium with different EM-source sizes. Analysis and measurements were performed using a dipole antenna at 900 MHz and a COST244 cubic phantom. From this, an empirical equation has been derived, representing the attenuation characteristics of the SAR. The equation takes into consideration an energy loss due to the spatial spread of electromagnetic waves. In the case where an antenna is placed more than λ/2π away from the medium, the attenuation characteristics of the SAR are those obtained from plane waves in the lossy medium. In the case where a half-wavelength dipole antenna is located close to the medium, at a distance of less than λ/2π, the attenuation characteristics of the SAR are calculated from an equation that includes a loss caused by the spread of energy as a cylindrical wave. Moreover, when the length of antenna is short, it is found that a spatial attenuation factor appropriate to a spherical wave should be taken into account.
- Publication
- IEICE TRANSACTIONS on Communications Vol.E88-B No.6 pp.2391-2400
- Publication Date
- 2005/06/01
- Publicized
- Online ISSN
- DOI
- 10.1093/ietcom/e88-b.6.2391
- Type of Manuscript
- Special Section PAPER (Special Section on 2004 International Symposium on Antennas and Propagation)
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Shoichi KAJIWARA, Atsushi YAMAMOTO, Koichi OGAWA, Akihiro OZAKI, Yoshio KOYANAGI, "Attenuation Characteristics of the SAR in a COST244 Phantom with Different EM Source Locations and Sizes" in IEICE TRANSACTIONS on Communications,
vol. E88-B, no. 6, pp. 2391-2400, June 2005, doi: 10.1093/ietcom/e88-b.6.2391.
Abstract: This paper addresses the variation of the attenuation characteristics of the Specific Absorption Rate (SAR) in a lossy medium as a function of the distance between an antenna and the medium with different EM-source sizes. Analysis and measurements were performed using a dipole antenna at 900 MHz and a COST244 cubic phantom. From this, an empirical equation has been derived, representing the attenuation characteristics of the SAR. The equation takes into consideration an energy loss due to the spatial spread of electromagnetic waves. In the case where an antenna is placed more than λ/2π away from the medium, the attenuation characteristics of the SAR are those obtained from plane waves in the lossy medium. In the case where a half-wavelength dipole antenna is located close to the medium, at a distance of less than λ/2π, the attenuation characteristics of the SAR are calculated from an equation that includes a loss caused by the spread of energy as a cylindrical wave. Moreover, when the length of antenna is short, it is found that a spatial attenuation factor appropriate to a spherical wave should be taken into account.
URL: https://global.ieice.org/en_transactions/communications/10.1093/ietcom/e88-b.6.2391/_p
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@ARTICLE{e88-b_6_2391,
author={Shoichi KAJIWARA, Atsushi YAMAMOTO, Koichi OGAWA, Akihiro OZAKI, Yoshio KOYANAGI, },
journal={IEICE TRANSACTIONS on Communications},
title={Attenuation Characteristics of the SAR in a COST244 Phantom with Different EM Source Locations and Sizes},
year={2005},
volume={E88-B},
number={6},
pages={2391-2400},
abstract={This paper addresses the variation of the attenuation characteristics of the Specific Absorption Rate (SAR) in a lossy medium as a function of the distance between an antenna and the medium with different EM-source sizes. Analysis and measurements were performed using a dipole antenna at 900 MHz and a COST244 cubic phantom. From this, an empirical equation has been derived, representing the attenuation characteristics of the SAR. The equation takes into consideration an energy loss due to the spatial spread of electromagnetic waves. In the case where an antenna is placed more than λ/2π away from the medium, the attenuation characteristics of the SAR are those obtained from plane waves in the lossy medium. In the case where a half-wavelength dipole antenna is located close to the medium, at a distance of less than λ/2π, the attenuation characteristics of the SAR are calculated from an equation that includes a loss caused by the spread of energy as a cylindrical wave. Moreover, when the length of antenna is short, it is found that a spatial attenuation factor appropriate to a spherical wave should be taken into account.},
keywords={},
doi={10.1093/ietcom/e88-b.6.2391},
ISSN={},
month={June},}
Copy
TY - JOUR
TI - Attenuation Characteristics of the SAR in a COST244 Phantom with Different EM Source Locations and Sizes
T2 - IEICE TRANSACTIONS on Communications
SP - 2391
EP - 2400
AU - Shoichi KAJIWARA
AU - Atsushi YAMAMOTO
AU - Koichi OGAWA
AU - Akihiro OZAKI
AU - Yoshio KOYANAGI
PY - 2005
DO - 10.1093/ietcom/e88-b.6.2391
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E88-B
IS - 6
JA - IEICE TRANSACTIONS on Communications
Y1 - June 2005
AB - This paper addresses the variation of the attenuation characteristics of the Specific Absorption Rate (SAR) in a lossy medium as a function of the distance between an antenna and the medium with different EM-source sizes. Analysis and measurements were performed using a dipole antenna at 900 MHz and a COST244 cubic phantom. From this, an empirical equation has been derived, representing the attenuation characteristics of the SAR. The equation takes into consideration an energy loss due to the spatial spread of electromagnetic waves. In the case where an antenna is placed more than λ/2π away from the medium, the attenuation characteristics of the SAR are those obtained from plane waves in the lossy medium. In the case where a half-wavelength dipole antenna is located close to the medium, at a distance of less than λ/2π, the attenuation characteristics of the SAR are calculated from an equation that includes a loss caused by the spread of energy as a cylindrical wave. Moreover, when the length of antenna is short, it is found that a spatial attenuation factor appropriate to a spherical wave should be taken into account.
ER -
English
