混合扫描多子阵平板天线旁瓣电平优化研究

Sidelobe Reduction of the Hybrid Scanning Planar Antenna with Multiple Subarrays

多子阵技术是平板天线动中通降低天线系统高度的重要方法,但其离散口径却带来了高旁瓣,且难以通过传统的不等幅馈电技术得以抑制。文中从理论上分析了混合扫描多子阵平板天线的方向图特性,给出了几种降低旁瓣电平的方法。以降低天线扫描范围内的最高旁瓣电平为目标,采用遗传算法对子阵间距进行优化研究,仿真结果表明子阵间距优化可以显著降低天线的旁瓣电平。该方法与分析结果可为多子阵平板天线的设计提供参考。

The planar antenna with multiple subarrays is widely adopted to reduce the height of antenna of Satcom on-the-move(SOTM).However,the sidelobe of the antenna is deteriorated because of its dispersed aperture,and is hard to be reduced by amplitude weighting.The characteristics of the hybrid scanning planar antenna with multiple subarrays are analyzed in this paper,and some methods for sidelobe suppression are given.In order to reduce the maximum sidelobe level of the antenna in the whole elevation scan range,the subarray distances are optimized by genetic algorithm(GA).Simulation results show that the optimization subarray distances can suppress the sidelobe level effectively.The methods and results may be used as the reference to the design of the planar antenna with multiple subarrays.