Specific Absorption Rate Reduction Methode for Brain Safety in 5G Application

This paper presents a new Specific Absorption Rate (SAR) reduction method for Planar Inverted F Antenna (PIFA) for mobile devices in 5G. The approach is to perform periodic corrugations on the ground plane. This in turn adjust the current density induced by the antenna on the ground plane and eventually reduce SAR. Analysis of corrugation at different positions in the ground plane is presented. The design parameters of corrugations are optimized to maintain impedance matching and SAR reduction over 3.4 GHz to 3.8 GHz. Compared to the reference antenna, the peak value of 10 g average SAR of corrugated antennas are reduced by 57%. In addition, the efficiency of low SAR antennas is investigated. The validity of the proposed approach is proved by the simulation results of the antenna.