FDTD simulations of a mobile phone operating near a metal wall

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 high-resolution human head model and a metal wall enclosed by the perfectly matched layer (PML). The PML acts as an electromagnetic field absorbing layer and was backed by a perfect electric conductor. An antenna model operated at 900 MHz. and 1800 MHz. were used in the simulation. The Specific Absorption Rate (SAR) was computed and averaged on a tissue mass of one gram and ten grams which is called SAR 1-g and SAR 10-g, respectively. The main purpose of the present research is to compare SAR of using a mobile phone at two different frequencies (900 MHz and 1.8 GHz) in the close proximity to a metal wall. Simulation results show that all SAR values decrease dramatically at both 900 MHz. and 1800 MHz. frequencies, as location of an antenna gets closer to a metal wall.