匹配网络对测向天线阵性能的改善

利用相位信息确定来波入射角能达到较高的精度，但测向天线之间的互耦对系统性能的影响很大。加载匹配网络人但能降低接收机端口的驻波收，还能有效地减弱天线之间互耦的影响，改善系统性能。本文给出使用矩量法分析天线阵接收性能时几个关键问题的处理方法。加载不同匹配网络的结果表明，加载有耗网络会改善系统的测向性能，但系统的最大增益要降低。同时发现，对应对称振子和天线阵的特征尺寸出现了“广义谐振”现象，这种现象的消

Improving the Performance of Direction Finding System by Loading the Array with Matching Networks

High accuracy can be obtained in direction finding system where the angle of incidence is determined by the phase information of the incident wave, but the mutual coupling between antennae will effect the performance of the system. Loading the antennae with matching networks will not only decrease the VSWR at the ports of the receivers, but also reduce the influence of the mutual coupling. Some key techniques using the Method of Moments in the analysis of receiving performance of array are given. The results illustrate that loading lossy network can improve the performance of the system, but decrease the maximum gain. The phenomenon named "Generalized resonance" corresponding to the characteristic dimensions of the antennae and the array has also been found which can only be shifted out of the band by adjusting the characteristic dimensions.