JOURNAL OF COMPUTERS (JCP)
ISSN : 1796-203X
Volume : 4    Issue : 2    Date : February 2009

FDTD Simulation of a Mobile Phone Operating Near a Metal Wall
Nuttaka Homsup, Terapass Jariyanorawiss, and Wiroj Homsup
Page(s): 168-175
Full Text:
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Abstract
The Finite-Difference Time-Domain (FDTD) is the most often used method for evaluating of
electromagnetic fields in human tissue. This paper presents a study of heating effects resulted from
using a mobile phone operating near a metal wall. The finite-difference time-domain (FDTD)
simulation scheme was used in the simulation. The simulated physical domain consists of a
dipole antenna, a highresolution human head model and a metal wall enclosed by the Perfectly
Matched Layer (PML). In this case, the PML acts as an electromagnetic field absorbing layer and
was backed by a perfect electric conductor. An antenna model operated at 900 and 1.8 GHz was
used in the simulation. The Specific Absorption Rate (SAR) was computed and averaged on a
tissue mass of one gram and ten grams, SAR 1-g and SAR 10-g, respectively. The main purpose of
the present research is to compare SAR resulted from a mobile phone operated at two different
frequencies (900 MHz and 1.8 GHz) in the close proximity to a metal wall. Also, average powers
(P
avg) obsorbed in various human tissues were computed with a distance between an antenna and
a metal wall (Δ
l) as a varying parameter. Results from the simulation show that the computed SAR
1-g and SAR 10-g values are not exceed the limitation values established by various standard
institutes. Also, the average power absorbed in all tissue models with a mobile phone operated at
1.8 GHz has an average power lower than those operated at 900 MHz except for the average power
absorbed in muscle (7<Δ
l< 9 cm) and eye (7< Δl<11cm).

Index Terms
Finite-Difference Time-Domain (FDTD), Perfectly Matched Layer (PML), SAR.