FDTD Based Numerical Calculation of Electromagnetic Wave Radiation in Multi-layer Circular Cylindrical Human Head

Electromagnetic radiation rate in the multi-layer circular cylindrical human head model are studied using FDTD (finite different time domain) method in two different frequencies 3.35 GHz and 4.5 GHz. Human head is designed as the layered structures such as skin, fat, bone, Dura, CSF (Cerebrospinal fluid) and brain. The electrical and magnetic fields are numerically examined by FDTD method of two dimensional Maxwell’s equation. For 2D FDTD, the electric field is polarized along the cylindrical axis and FDTD method is implemented with Matlab programming. The electric field point source is kept near cylindrical human head and then analyze the nature of wave propagation to the tissue layer by layer using the impedance mismatch and specific absorption rate (SAR). Only some part of head that located near the source has the high level of E field absorption rate and then it sharply decreases. The electric field absorption rate reach peak in Skin and CSF layer. This paper also mentions the relationship between the rising of SAR rate and the reflection rate at each tissue layer interface.