为了解决现有设计方法在设计天线副镜为中小电尺寸时，天线性能难以达到预期的问题，并进一步提高天线G／T值的目标，研究了反射镜感应电流在副镜、主镜边缘截断对天线辐射性能的影响，分别提出了副镜边缘扩展和主镜边缘扩展2种设计方法，并对2种方法设计的天线进行仿真计算。计算结果显示，2种设计方法有效地改善反射镜边缘电流的连续性，其中副镜扩展设计可用于提高天线的增益，主镜扩展设计可用于提高天线G／T值。%The current design method of dual⁃reflector antenna becomes less effective when the sub⁃reflector is electrically small.In view of this problem,the influence of reflector induced current truncation at sub⁃reflector and main⁃reflector edges on antenna radiation performance is studied in order to improve the G/T value of dual⁃reflector antennas.The two design methods such as sub⁃reflector edge extension and main⁃reflector edge extension are proposed,and the simulation calculation are implemented for the antennas designed with these two methods.The results show that these two methods can effectively improve the continuity of reflector edge current,the sub⁃re⁃flector extension design can be used for improving the antenna gain,and the main⁃reflector extension design can be used for improving G/T value of antenna.
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