Evaluation of SAR Reduction for Dipole Antenna Using RF Shield

In this paper we propose to use radio frequency (RF) shield on dipole antenna to reduce Specific Absorption Rate (SAR) in the spherical head model. RF Shields made of Ferrimagnetic material are used to suppress surface current on antenna. Many kinds of simulation are performed to investigate the effect of various parameters like thickness, size, location and type of the shield on the SAR using CST-Microwave studio, the field simulation software. Paper includes numerical evaluation of the SAR reduction and also analyzes the SAR data for shielding effectiveness. Drastic reduction in SAR was observed in case of Ferrite3 material with increase in shielding size and thickness. However there was no appreciable change in SAR for change in shielding location. Simulation results will be useful for compliance testing of wireless communication devices.