具有散射对消功能的赋形阵列天线优化

Optimization of shaped-beam array antennas with the function of scattering cancellation

针对阵列天线的隐身问题,提出了一种基于对消式有源隐身的新方法。首先通过粒子群算法(PSO)对阵列天线进行优化综合,分别产生赋形主波束和与阵列天线结构项散射场等幅反相的对消波束,然后根据主波束与对消波束的相对大小将两组激励线性叠加,叠加后的激励能够使得阵列天线在产生赋形主波束的同时生成对消波束,以抵消阵列天线自身的散射。该方法为低RCS阵列天线的设计提供了一种新思路,数值计算结果表明了方法的可行性。

As for the stealth problem of array antennas, a new method based on the active cancellation stealth is proposed. Firstly, Particle Swarm Optimization （PSO） algorithm is used to optimize the array antennas. The shaped main beam and the cancellation beam are produced respectively. The cancellation beam has the same amplitude and opposite phase with the structural mode scattering wave of the array antennas. Then the two sets of excitation are added together according to the relative size of the main beam and the cancellation beam. The array antennas excited with the new excitation can produce the shaped-beam with a cancellation beam, which can cancellthe scattering wave of the array antennas. This method provides a new approach to reduce the RCS of the array antennas, and numerical results show the feasibility of the method.