Absorbed power density on a spherical model exposed to electromagnetic field from phased array antennas

This study investigated the effect of the beamforming capability of phased array antennas, incidence angle, and polarization on the assessment of local exposure to the electro-magnetic field for a spherical body model. The highest absorbed power density (APD) levels on a spherical model are estimated for various separation distances and antenna configurations under uniform amplitude and variable phase excitation and compared with the peak spatial APD under constant amplitude and uniform phase excitation. The increase of APD through the optimization of excitation phases exhibited the same distance dependency for the vertical and horizontal array configurations. In both cases, the maximum spatial value of APD was observed at the closest point to the center of the array antenna.