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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。加载匹配网络不但能降低接收机端口的驻波比 ,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 ,这种现象的消除只能通过改变系统的特征尺寸来实现。
The use of phase information to determine the incident angle to the wave can reach a higher accuracy, but the mutual coupling between the directional antennas have a great impact on system performance. Loaded matching network can not only reduce the VSWR of the receiver port, but also effectively reduce the influence of the mutual coupling between the antennas and improve the system performance. In this paper, several key problems in the analysis of antenna array receiving performance using moment method are given. The results of loading different matching networks show that loading a lossy network will improve the DF performance of the system, but the maximum gain of the system should be reduced. At the same time, it is found that the phenomenon of “generalized resonance” appears in the feature sizes of the corresponding symmetric oscillator and antenna array. The elimination of this phenomenon can only be achieved by changing the feature size of the system.