A new approach to assess the Specific Absorption Rate induced by multiple plane waves at 2.1 GHz

In this paper, a new and fast numerical approach is proposed to assess the Specific Absorption Rate (SAR) in a heterogeneous human body model induced by 5 plane waves having amplitudes log-normally distributed, azimuth angles and phases uniformly distributed between 0° and 360°. We performed a complete statistical analysis with only 36 azimuth angles. The values of WBSAR are computed for a V-polarized plane wave and for azimuth incidence angles varying between 0° and 350° with a step of 10°. To assess the exposure to 5 plane waves, the amplitudes and the phases induced by each plane wave in the human body are summed and recombined cells by cells. Considering this finite set of 36 azimuth angles, we set up a Latin Hypercube Sampling design. The values of whole body SAR are statistically analyzed. A model of regression terms based on the relationship between the WBSAR and incidences among (surface projected) have been proposed and analyzed. Using input parameters and the WBSAR results, we estimate with regression the model coefficients. The accuracy of this model is analyzed and discussed.