3D Double-Directional 105 GHz Channel Sounder for Ultra-Wideband Low Sub-THz Propagation Measurement

This study presents the world's fastest three-dimensional double-directional channel sounding system operating at 105 GHz with a null-to-null bandwidth of 4 GHz. The developed channel sounding system allows a full scan of the 105 GHz multipath channel in both azimuth and elevation angles of the transmitter (TX) and receiver (RX) directional antennas. The developed channel sounding system is calibrated with an anechoic measurement in that the path loss of the observed line-of-sight ray coincides with the free-space path loss. Moreover, the anechoic measurement verifies the performance of the channel sounding system, where the peak width at the half-power in delay domain is lower than 0.5 ns, and the peak width at the half-power in angular domain is approximately 10° in the azimuth plane for both TX and RX.