平面相控阵天线和差分布馈电网络设计

摘要

The conflict between sum and difference patterns is a serious problem in large⁃scale monopulse phased⁃array antenna system.The traditional solution of this problem needs complicated feed network and high cost of hardware.In this paper,a novel design method is presented to achieve good sum and difference patterns,which significantly reduces the complexity of the large⁃scale monopulse phased⁃array antenna feed network. A 3 000⁃element phased array antenna feed network is designed with this method. The simulation results are given as below:sidelobe level of sum pattern< -28 dB,sidelobe level of elevation⁃difference pattern< -22 dB,sidelobe lev⁃el of azimuth⁃difference pattern < -28 dB.These results verify the feasibility of the proposed method.%大型单脉冲相控天线馈电网络的接收波束存在“和差矛盾”问题，传统的解决方案需要相当复杂的馈电网络和硬件成本。因此提出一种馈电网络设计方法，在获得接收和波束、方位差波束以及俯仰差波束低副瓣电平的同时，降低大型单脉冲相控阵天线馈电网络的复杂性。用该方法设计的3000单元二维相扫平面阵列天线馈电网络，仿真结果为：接收和波束副瓣电平＜－28 dB，俯仰差波束副瓣电平＜－22 dB，方位差波束副瓣电平＜－22 dB，仿真结果验证了该设计方法的有效性。