Dual-Polarized Sub-THz Channel Measurements in D-Band in an Industrial Environment

In this paper, we introduce a novel time domain (TD) correlation based channel sounder that operates in the D-band (110 GHz to 170 GHz) with which we performed dual-polarized sub-THz channel measurements in an industrial environment. The channel measurements cover all four channel polarization components: two co-polar channels and two cross-polar channels. This was achieved by changing the antenna polarization both at the transmitter (TX) and receiver (RX). To evaluate the impact of the antenna type, two different antennas at the RX side were used: On the one hand, a WR-06 waveguide probe antenna and on the other hand, a WR-06 waveguide pyramidal horn antenna with a higher gain and a narrower half-power beam width (HPBW). The collected channel impulse responses (CIRs) of 8 measurement positions were evaluated with regards to the path loss and the cross-polarization ratio (CPR). The measurements report, that the cross-polarization isolation (CPI) in average is around 30 dB and the average CPR is around -24.4 dB. Further, the antenna's HPBW has a strong impact on the CPR leading to deviations of around 4 dB.