Study on the Reduction of the Local Specific Absorption Rate of a 1.2-GHz- Band Transceiver with a Reflector

Amateur radio stations, which use greater radiation power than smartphones, are expected to have a high specific absorption rate (SAR). However, few studies have explored the electromagnetic wave exposure in amateur stations. In this paper, we propose mounting a reflector on a 1.2-GHz-band monopole antenna that is mounted on a transceiver-simulating metallic case. Numerical analysis was performed through the finite-difference time-domain (FDTD) method using a simple brain-equivalent model and a numerical model of the human body. The results demonstrated that the SAR can be reduced through the proposed method without greatly altering the antenna characteristics.