Electromagnetic absorption in the human head and neck for mobiletelephones at 835 and 1900 MHz
Gandhi, O.P.
Lazzi, G.
Furse, C.M.
Dept. of Electr. Eng., Utah Univ., Salt Lake City, UT;
This paper appears in: Microwave Theory and Techniques, IEEE Transactions on
Publication Date: Oct 1996
Volume: 44,
Issue: 10, Part 2
On page(s): 1884-1897
ISSN: 0018-9480
References Cited: 16
CODEN: IETMAB
INSPEC Accession Number: 5414640
Digital Object Identifier: 10.1109/22.539947
Current Version Published: 2002-08-06
Abstract
The authors have used the finite-difference time-domain method and
a new millimeter-resolution anatomically based model of the human to
study electromagnetic energy coupled to the head due to mobile
telephones at 835 and 1900 MHz. Assuming reduced dimensions
characteristic of today's mobile telephones, the authors have obtained
SAR distributions for two different lengths of monopole antennas of
lengths λ/4 and 3λ/8 for a model of the adult male and
reduced-scale models of 10- and 5-year-old children and find that peak
one-voxel and 1-g SARs are larger for the smaller models of children,
particularly at 835 MHz. Also, a larger in-depth penetration of absorbed
energy for these smaller models is obtained. The authors have also
studied the effect of using the widely disparate tissue properties
reported in the literature and of using homogeneous instead of the
anatomically realistic heterogeneous models on the SAR distributions.
Homogeneous models are shown to grossly overestimate both the peak
1-voxel and 1-g SARs. Last, the authors show that it is possible to use
truncated one-half or one-third models of the human head with negligible
errors in the calculated SAR distributions. This simplification will
allow considerable savings in computer memory and computation
times
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