Abstract
This paper presents Finite Difference Time Domain (FDTD) simulation results of operating mobile phone near metal wall sheet and near a one metal cell. Results show that placing a one metal cell closed to a mobile phone is more harmful to human health than a metal wall sheet. The one metal cell is the Yee’s cell that has a metal characteristic, high conductivity and low permittivity. In general, the mobile phone was modeled by a dipole antenna so the one metal cell’s characteristic can be chosen as the dipole’s characteristic. This simulation uses Finite Difference Time Domain (FDTD) scheme. It’s domain is divided into two parts: the physical domain and the artificial domain. The physical domain consists of a dipole antenna located at 1 cm from a human head model and a one metal cell varied distance (Δl) from the dipole. In addition, the dipole antenna operated at 900 MHz and 1800 MHz was used in the simulation. The artificial domain is a Perfectly Matched Layer (PML). The PML acts as an electromagnetic field absorbing layer and was backed by a Perfect Electric Conductor (PEC). 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. Also, the average power (Pavg) absorbed in various human tissues is computed with a distance between the dipole antenna and a one metal cell as a varying parameter (Δl). Simulation results from a one metal cell will be compared to referenced values. There are three reference SAR values: the standard SAR 1-g (FCC, Federal Communications Commission), the simulation in an open area and the simulation with the metal wall. In this case, 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 (1.6 Watt/kg), however, for Δl = 0-5 cm, both of the SAR and the average power absorb are higher than the simulation with the metal wall and the simulation in an open area. Keywords-FDTD, PML, metal wall ,one metal cell
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