Electric field distribution and SAR in human head from mobile phones

This paper presents the distribution of electric field inside a human head as well as around the electromagnetic field source, i.e. the mobile phone. Specific Absorption Rate (SAR), which is obtained inside a human head and the thermal effect due to exposure to electric field from mobile phone was presented. For this research two different models of human head have been used. In the first case electromagnetic parameters of biological tissues of human head were modeled with a volumetric interpolation function that estimates the characteristics of a given tissue inside the human head while in the second case model with layers was used. The layers represent human head parts (skin, fat tissue, muscles, the skull, and the brain). The parts of the human head are based on their electromagnetic properties (conductivity, electric permittivity, and magnetic permeability). In order to obtain the electric field distribution for different cross-sections, the numerical calculation based on the Finite Integration Technique (FIT) and Finite Element Method (FEM) was performed.

I. Introduction

In our everyday life we often use and encounter sources of nonionizing radiation, from our place of residence or work to modern means of communication. All these sources are anthropogenic. In order to make everyday life more comfortable, various wireless devices used for transfer of different multimedia content and for regular daily activities at home have been developed. The common characteristic of all such devices is that they are sources of nonionizing radiation.