Analysis on the Specific Absorption Rate due to the metallic objects exposed to radiation source

This paper discusses the simulation and measurement results of Specific Absorption Rate (SAR) due to the presence of common metallic items close to the radiation source. Numerical simulations are performed by using Finite Integration Technique (FIT). A heterogeneous Voxel body model is used in the simulation and has been exposed to a simple λ/2 dipole antenna at three different frequencies; 0.9, 1.8, and 2.4 GHz. In order to investigate the effect of metallic item, three types of common metallic objects are introduced and discussed in this paper. The results indicated that the presence of coin and ring significantly affect the value of point SAR. Higher increment of 16 times from reference SAR is observed at 1.8 GHz in the presence of 28 mm (diameter) ring. The measurement result is in good agreement with simulation results (at 2.4 GHz) indicating that the presence of metallic ring increases the point SAR by more than 10%.