zastosowania elektromagnetyzmu w nowoczesnych ... - PTZE

XVIII Sympozjum PTZE, Zamość 2008
CALCULATION OF SAR IN BIOLOGICAL OBJECTS
WITH DIFFERENT PARAMETERS
Introduction
Katarzyna Ciosk
Kielce University of Technology, Poland
The use of wireless personal communication devices, especcialy cellular telephones has
increased rapidly during last decade. Cellular communication systems require the use of many
base stations located throughout a service area and it is necessary to install antenas on
residential and public buildings. Hence, a general public concern about possible
electromagnetic hazards coming from these wireless communication sources has emerged in
the last years. The SAR (Specific Absorption Rate) coefficient is recommended as parameter
to determine the energy absorbed by the body exposed to electromagnetic field. The SAR
takes into account the incient electromagnetic field parameters and also parameters of the
body subjected to electromagnetic field. Value of SAR depends on the incident field
parameters such the intensity, polarization [1] and frequency [2]. The absorption of
electromagnetic field depends also on parameters of object such as size, shape and orientation.
SAR is higher when the body is more perpendicular than parallel to an incident field. It is also
higher when the cross section of the body perpendicular to the incident magnetic field is
larger.
The aims of this study is to analyse the influence of the body shape and electrical properties
on whole body SAR in spheroidal biological object shown in Fig.1.
Method of calculation
E
H
Fig. 1. Schematic diagram of spheroidal model
To trace the influence of body properties on the value of the whole-body SAR the calculations
were made. The values of the SAR were calculated based on the calculating of the electric
field strength distribution inside the body. The model as a prolate spheroid with major axis
x
k
z
y
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