CMOS Camera-Type THz Compact Antenna Test Range for Far-Field Radiation Pattern Analysis

This paper presents a CMOS camera-type THz compact antenna test range (CATR) to facilitate a convenient means to measure far-field radiation patterns of transmitters (TXs). For concept validation, we measured the far-field radiation pattern of a 26-dBi 0.852-THz standard gain horn antenna-type TX with known far-field characteristics with the THz CATR. With the help of geometrical multi-frame super-resolution imaging, the directivity determination accuracy achieved at a peak signal-to-noise ratio (PSNR) of 34.8 dB is 0.2 dB. Further, we investigated a THz continuous-wave (CW) photomixer TX with unknown far-field characteristics at 0.852 THz. It emits a higher-order mode far-field radiation pattern, and its directivity is 25.4 dBi, determined at a PSNR of 31.8 dB.