Time-gating method for V/UHF antenna pattern measurement inside an anechoic chamber

Traditionally, the time-gating method (TGM) is helpful in improvement of ordinary antenna pattern measurement. But for a low frequency antenna under test (AUT), especially a narrow bandwidth AUT, even inside an anechoic chamber, the improvement may be very limited. This paper presents a method of bandwidth expanding for a FD measuring system, which can realize TGM with its fast frequency sweep function. By this means, the interference caused by multi-path reflection can be reduced effectively, and the pattern of V/UHF AUT obtained can be more precise. The results from simulation and experiment show the efficiency of this new method.