Abstract: The wireless channel is the medium in which electromagnetic waves propagate in the air, and the channel characteristics determine the performance of the wireless communication system. To understand the terahertz channel characteristics in short-distance scenarios, based on the channel measurement in the 310 GHz frequency band, the large-scale fading characteristics and the small-scale fading characteristics of the terahertz channel are studied. The analysis of the results shows that the path loss of the terahertz channel in the short-distance scenario is consistent with the results of the free-space path loss model at 0.2 m. After 0.2 m, the measured path loss results are smaller, and the propagation conditions are better than the free space. The results of the Rice K factor and root-mean-square(RMS) delay spread shows that compared with low-frequency channels, the terahertz channel has a lower degree of delay dispersion, and the direct path occupies the main received signal energy. The Rice K factor and RMS delay spread shows a strong correlation. These results provide a theoretical model basis for the design and optimization of short-distance terahertz communications.

Key words: terahertz, channel measurement, path loss, Rice K factor