扫描波束天线无相位近场测量技术

以寻找高频扫描波束天线近场测量方法为目的, 提出了一种结合差分进化算法和迭代傅里叶变换算法的双平面无相位近场测量方法.首先用线极化探头在近区采集正交方向切向场幅值信息; 其次使用差分进化算法寻找合适的初始迭代相位; 再利用迭代傅里叶变换算法对一扫描面上的相位进行还原; 最后使用采样幅值和还原相位结合近远场变换理论求得天线远场方向图.为验证方法可行性, 以对称振子天线阵为模型, 对不同扫描角时的测量过程进行仿真, 均获得良好结果.

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 de-termine 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 polari-zation probe.Secondly,an appropriate initial iterate phase distribution is obtained by applying the differ-ential evolution algorithm to the collected field amplitude data.Thirdly,iterate Fourier transform is cho-sen to revival the phase distribution on one of the scanning planes.Finally,far-field pattern can be recon-structed 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.