Relationship between PD and Polarization for mm-Wave Handset Antennas

For wireless terminal devices at mm-wave bands, power density (PD) is an important metric to measure the impact of radiation on the human body. In this work, we investigate the relationship between PD and antenna polarizations using simple patch antennas with different polarizations. The square patch array, resonating at 29.4 GHz, is mounted along the frame of the mobile handset. It is observed that the PD of the horizontally polarized array is greater than that of the vertically polarized array. The underlying reasons are explained.