EM fields in a human body due to a Manpack transceiver for different soil conditions

In this work, electromagnetic (EM) energy radiating into a model of a human body carrying a Manpack transceiver is calculated numerically using the finite-difference time-domain (FDTD) method. The specific absorption rate (SAR) values are calculated for the cases of a human body standing on dry and 13.77% wet loamy soil conditions at the frequencies of 80 MHz and 150 MHz. Initially the near- and far-field radiation field patterns of the Manpack transceiver in free space are validated by comparing computations from FDTD and the method of moments. This study shows that more EM radiated energy is coupled to the lower part of the body than to the upper region at 80 MHz, while more energy is coupled to the upper body region at 150 MHz. The wet loamy soil case resulted in higher SAR values in the foot region as compared to the dry loamy soil case.