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采用多个小口径抛物面天线组成天线阵是反射面动中通系统降低天线高度的重要方法,但由于天线尺寸和数量的限制,合成天线方向图会形成较高的旁瓣。从理论上分析了抛物面合成天线的方向图特性,给出了几种降低峰值旁瓣电平的方法,并结合仿真实验讨论了不等幅馈电技术、天线间距以及子天线口径对合成天线峰值旁瓣电平的影响,采用遗传算法,以降低合成天线峰值旁瓣为优化目标对上述因素进行了全局优化。仿真结果验证了理论分析的正确性,表明综合运用不等幅馈电技术和减小天线间距可以显著降低天线旁瓣电平。
The use of multiple small-aperture parabolic antennas to form the antenna array is an important method for reducing the height of the antenna due to the moving center of the reflector. However, due to the size and number of antennas, the synthesized antenna pattern will form a high sidelobe. The theoretical analysis of the parabolic antenna characteristics of the directional pattern, given several methods to reduce the peak sidelobe level, and combined with simulation experiments discussed the unequal amplitude feed technology, antenna spacing and sub-antenna aperture on the composite antenna peak Sidelobe level, genetic algorithm is used to optimize the above factors in order to reduce the peak sidelobe of synthetic antenna. The simulation results verify the correctness of the theoretical analysis, indicating that the use of unequal amplitude feeding technology and reducing the antenna spacing can significantly reduce the antenna sidelobe level.