Title :
Specific Absorption Rates of Anatomically Realistic Human Models Exposed to RF Electromagnetic Fields From Mobile Phones Used in Elevators
Author :
Simba, Ally Y. ; Hikage, Takashi ; Watanabe, Soichi ; Nojima, Toshio
Author_Institution :
Nat. Inst. of Inf. & Commun. Technol., Tokyo
fDate :
5/1/2009 12:00:00 AM
Abstract :
This paper presents a detailed numerical investigation to determine whether or not an increased specific absorption rate (SAR) in an adult using a mobile phone inside an elevator due to the multireflections of electromagnetic fields from the walls exceed the RF-exposure guidelines. A fully realistic heterogeneous human body model and an actual elevator size were employed. The nonuniform mesh finite-difference time-domain technique and a supercomputer were employed to obtain the SAR and other important parameters. The mobile phone was modeled as a lambda/2 dipole antenna placed at a distance of 16 mm from the head. For computations, operating frequencies of 900, 1500, and 2000 MHz with transmitting power of 250 mW were used. Computed results show that the peak spatial-average 10-g SAR depends on the position of the passenger and the antenna against the elevator walls. We observed a substantial increase in the whole-body average SAR and peak 10-g SAR values of the passenger in the elevator over their respective free-space values. However, the maximum values obtained do meet the basic restrictions described in the international RF safety guidelines. For example, the maximum values of the whole-body average and peak spatial-average SAR were 4.4% and 78% of the international RF safety guideline, respectively.
Keywords :
UHF antennas; dipole antennas; electromagnetic fields; finite difference time-domain analysis; mobile handsets; RF electromagnetic fields; RF-exposure guidelines; SAR; anatomically realistic human models; dipole antenna; free-space values; frequency 1500 MHz; frequency 2000 MHz; frequency 900 MHz; international RF safety guidelines; mobile phones; nonuniform mesh finite-difference time-domain technique; specific absorption rates; Finite-difference time-domain (FDTD) technique; multireflections; realistic human model; specific absorption rate (SAR);
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2009.2017354