Analysis of Materials Effects on Radio Frequency Electromagnetic Fields in Human Head

In this paper, we propose to study the variability of speciflc absorption rate (SAR) of a human head due to difierent materials in the vicinity of the handset. We include the efiects of the human hand, handset chassis and additional conductive material particularly hand- ring jewelry. A flnite-difierence time-Domain (FDTD) method was used to analyze difierent positions of the conductive ring materials within the hand model. Furthermore, the impact of this material on the performance of an antenna was considered in this study. We found that including a hand model leads to a signiflcant reduction in SAR. The hand in∞uences not only SAR distribution but also antenna performance. Moreover, adding conductive materials to the hand results in increases in the local SAR values of the head model. The results suggest that the hand model is important in SAR evaluation and that having an additional conductive material on the hand may vary the amount of electromagnetic (EM) energy absorption depending on the position of the material.

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