Design and Application of Off-focus Multi-feed Compact Range for 5G Over-the-Air Test

This paper presents a multi-feed compact range system for 5G Over-the-Air (OTA) test. There are 4 different feed antennas arranged around the focus of the compact antenna test range (CATR) which cover 6 to 90 GHz frequency band. The efficiency of out-of-band spurious emission test is improved 3 times as a minimum. In addition, the two optimized off-focus 24-50GHz in-band feed antennas are introduced enable the whole system supports 3-channel in-band measurement simultaneously. The antenna under test (AUT) is measured both using the focus and off-focus feed antennas, it is observed that the inconsistency of the main lobes is less than 0.1dB.