Specific Absorption Rate (SAR) Distribution in the Human Head at Global System Mobil (GSM) Frequencies

When electromagnetic waves hit a biological tissue, the wave is absorbed, refracted and diffracted. The physical modification of matter after interaction can have a biological effect. The paper's purpose estimate the Specific Absorption Rate (SAR) distribution in a human head exposed to electromagnetic field emitted from a handheld cellular phone operating in the 900 MHz and 1800 MHz rang in a partially closed environment. The HFSS software called high frequency structure simulator (HFSS) and the Finite-Difference Time-Domain (FDTD) computations were used to evaluate the SAR in realistic anatomically based model of the human head for different antenna-head distances.