This paper describes a new method which uses IDFT (Inverse Discrete Fourier Transform) technique to do time-domain near-field measurement for antenna.According to Fourier Transform Theory

the feasibility of this method is demonstrated in this paper.Some calculation examples show that this method is effective and exact.The errors led by this method are analyzed and the principles for deciding the key parameters in using this method are given

the test results are discussed and the conclusions are reached.