基于自适应算法的带罩阵列天线方向图综合

A Pattern Synthesis Method for Radome-enclosed Adaptive Array Antenna

提出一种基于自适应天线理论的带罩阵列天线方向图综合方法。先用射线追踪法计算到达罩内阵列天线的入射信号,通过自适应算法进行波束赋形,再用表面积分法得到带罩自适应天线的远区辐射场。用权函数的迭代来减小带罩方向图和无罩方向图的差别,实现天线与罩的一体优化。数值仿真结果表明,该方法能实现对带罩阵列天线主瓣指向、零陷位置和副瓣电平的控制,同时减小了天线罩对系统辐射特性方面的影响。

This paper presents a pattern synthesis method for the radome-enclosed antenna based on the adaptive array theory.The incident signal of the antenna-radome system is calculated with the ray tracing technique first.Then the synthesis pattern is formed by an adaptive algorithm.The surface-integration method is employed to the far-field radiation formulation for the radome-enclosed adaptive array antenna.The values of the weighting function are iterated to minimize the absolute difference between the synthesized and desired patterns,which can optimize the antenna-radome system.Numerical examples show that the algorithm can steer the main beam and null in given directions and yield the sidelobe meeting a specified level.The method can minimize the effect of the radome on the system radiation characteristics.