Phaseless near-field measurement of scanned bean antenna

For finding the method to measure the high frequency scanned bean antenna, this paper presents a method combing differential evolution algorithm with iterate Fourier transform algorithm to determine the far-field pattern of the antenna under test. This method firstly collects the field amplitudes in two orthogonal directions on two scanning planes in the near-field region of the antenna with linear polarization probe. Secondly, an appropriate initial iterate phase distribution is obtained by applying the differential evolution algorithm to the collected field amplitude data. Thirdly, iterate Fourier transform is chosen to revival the phase distribution on one of the scanning planes. Finally, far-field pattern can be reconstructed according to the near-field far-field transform theory. A simulation is performed in different bean direction angles which confirm the good performance of the presented method.