Skin Dosimetry Analysis Based on a Spatial Synthetic Exposure Equipment at 60 GHz

This study presents a millimeter wave dosimetry analysis based on a spatial synthetic exposure system for real animal experiments. The exposure system consists of two lens antennas operating at 60 GHz, creating a focused radiation beam area within 1 cm² at the skin surface of the exposure target. The spatially averaged absorbed power density (sAPD) at the skin surface was calculated by FDTD method using a high-resolution rat voxel model, with the beam directed towards the dorsal side of the rat. Considering the potential misalignment of the exposure beam in realistic experiments, the deviation in sAPD caused by the location of the focal beam was analyzed. The results showed that, compared to the variation caused by the separation distance between the antenna and the skin surface, the misalignment of the synthetic beam center on the exposed area may have a larger impact on the calculated sAPD. This may be due to slight changes in the averaging area of the sAPD on the uneven skin surface.