SAR reduction in implant body area networks with spatial diversity reception

Abstract

This paper investigates the impact of spatial diversity reception on specific absorption rate (SAR) reduction at 400 MHz medical implant communication service (MICS) band. First, in order to calculate the bit error rate (BER) performance under this implant propagation channel and derive the required transmit power to secure a permissible BER, we perform finite-difference time-domain (FDTD) simulations for implant BAN channel modeling with a numerical human body model. Then, we calculate the local peak SAR under the required transmit power when the implant transmitter moves along the digestive organs. Consequently, our simulation results demonstrate that the use of spatial diversity reception can significantly reduce SAR in implant body area networks.