The Distance Effect in the Dosimetry Analysis of a Rat Model at GSM-900 Frequency Band: a Simulation Study
K. ATES H. Feza Carlak Sukru Ozen
AbstractIn this study, specific absorption rate (SAR) simulations of rat model have been carried out by using a finite integration technique (FIT). Although FIT is similar with finite difference time domain (FDTD) method in most ways, an integral form of Maxwell’s equations are used in the FIT method. A monopole antenna working at 900 MHz has been designed for the electromagnetic source. Conductivity and permittivity of tissue have been selected from realistic values and implemented for the voxel based rat model. Simulations have been implemented with the 5 W stimulation power. Aforementioned antenna has been located at 3.5 cm and 5 cm away from the nearest point of the rat model, respectively. Total SAR values are found as 0.483 W/kg for the 3.5 cm distance and 0.315 W/kg for the 5 cm distance. Maximum SAR induced at a head region as it is expected. Furthermore, cross section of the head and body results indicate that induced SAR vary in different parts of a body because of electrical properties of each tissue. As the distance of the antenna increases, the SAR value decreases. Results show that average SAR value in 1 gr rat tissue is higher than the value in 10 gr rat tissue.