准远场天线测量修正方法研究

Research on Correction Method of Quasi-far-field Antenna Test

远场测量是获得天线辐射特性的一种常用方法。然而对于一维电尺寸大,另一维电尺寸小的天线,如基站天线,由于场地因素的限制,往往不能满足远场测量条件,用近场测量又费时费力。在这种准远场条件下,天线测量结果与远场情况下的测量结果有较大差异。本文基于柱面波展开,给出了一种由准远场距离上测得的方向图计算远场的理论计算方法,经过该算法补偿后的结果与理论计算结果吻合很好,从而验证了算法的正确性。

Far-field antenna measurement is a common method to obtain antenna radiation characteristics.However,for the antenna with large one dimension and small one dimension,such as the base station antenna,it is often unable to meet the far-field test conditions due to the limitation of site factors,and the near-field measurement is timeconsuming and laborious.In this Quasi-far-field condition,the antenna test results are quite different from those in the farfield condition.This paper presents a theoretical calculation method for calculating the far-field pattern from the pattern measured on the distance of the Quasi-far field based on cylindrical wave expansion.The results of the algorithm are in good agreement with the results of the theoretical calculation,and the correctness of the algorithm is verified.