Finite-difference time-domain calculations of absorbed power in the ankle for 10-100 MHz plane wave exposure

The authors present finite-difference time-domain (FDTD) calculations of the short-circuit current and the specific energy absorption rate (SAR) in the ankle. Plane wave exposures from 10 to 100 MHz for an adult, a 10-year old, and 5-year old are considered. The calculations are performed in two parts. First, the coupling between a homogeneous whole body phantom and the applied field is calculated. The region around a lower leg is then expanded, the leg being described by a realistic fine-scale heterogeneous model. Tangential electric field components from the first part are used as boundary conditions on the reduced domain of the second part. Electric field values based on a maximum SAR of 20 W kg ^-1 are presented.