有源相控阵天线一般通过设置延迟单元来实现宽带信号扫描。但是在宽带工作方式时,存在波束偏转的问题。在大扫描角条件下,这个问题尤其突出。在这种情况下,波束实际指向与预期值的偏差较大,不能满足应用需求。本文针对有源相控阵雷达天线宽带模式的设计现状和应用需求,提出了两种改进方法。首先分析了现有宽带模式设计的局限性,并对天线波瓣方向图进行了仿真,说明了存在的问题;然后针对这些问题,提出了两种改进方法,其中一种改进方案已经在课题上应用,证明了技术的有效性。

AESA can realize broadband signal scanning through time delay unit. But when working in the broadband mode, the problem of beam deflection exists. The problem is more serious when the beam is canned to a big angle. In this situation, there is a big error in the beam pointing, and it can't meet application requirements. Aiming at the present status of designing of AESA radar's broadband mode and the application requirement,two improvement methods are proposed. Firstly,the present designing limitations of broadband mode are analyzed, and antenna lobe patterns are simulated. The existing problems are explained. Then aiming at these problems,two methods are proposed. One of them is proved effective through using in a subject.

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