The relatively poor performance of difference channel of a monopulse ring-focus antenna is accounted for, suitable aperture distribution functions are recommended, formulae of feed difference pattern needed are presented and sum-difference unified design method is put forward. To testify the theoretical method, the authors take a 3.5m C-band monopulse shaped ring-focus antenna with dual-polarization as an example. By using the presented method, the gain difference between the sum channel and the different channel is reduced from 6.5dB to 4.2dB , and the separation angle of the apexes of the different pattern of the antenna from 1.9° to 1.4°. Therefore, the normalized slope of difference pattern arrives at 1.4 with a particular monopulse feed.%分析了单脉冲环焦天线差通道性能较差的原因,推荐了适用的和差口径分布函数,得出了所需馈源差方向图计算式, 提出了和差性能一体化设计步骤.为了验证理论方法的正确性,以3.5?m变极化赋形单脉冲环焦天线为例,用本文提出的方法修改设计,使“和差矛盾”由6.5?dB减为4.2?dB,差方向图分离角由1.9°降为1.4°.因此, 使用特殊设计的单脉冲馈源可望将归一化差斜率提高到1.4.
展开▼
