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中文摘要：
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。
英文摘要：
The approach of dividing the required aperture into several smaller sub apertures is widely adopted in re- ducing the height of antenna of Satcom on-the-move （SOTM）. However, the sidelobe of the antenna is deteriorated as a re- sult of the constraint of the size and number of sub-aperture. The characteristics of the multiple-aperture antenna were ana- lyzed in this paper, and some methods for sidelobe suppression were given. In order to reduce the maximum sidelobe level of the antenna , factors mentioned above are optimized by genetic algorism. Simulation results prove the correctness of the theory and show that using a combination of perturbation of amplitude weighting and reducing the sub-aperture distance can suppress the sidelobe effectively.
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