大孔径全可动射电望远镜换馈系统设计
杨凤辉,汪敏,董亮,施硕彪

Design of feed switching system for large aperture fully movable radio telescope
Fenghui YANG,Min WANG,Liang DONG,Shuobiao SHI
表5 馈源改造后天线的主要性能指标值
Table 5 Main performance index values of antenna after feed modification
工作频率/GHz天线效率(45°)天线噪声温度/K电压驻波比圆极化轴比/dB
要求值测试值要求值测试值要求值测试值要求值测试值
2.2~2.31≥0.600.61≤64.056.32≤1.2∶11.2∶1≤1.00.75
4.5~6.9≥0.540.59≤35.034.75≤1.3∶11.25∶1≤1.51.0
7.6~9.0≥0.500.54≤45.031.63≤1.3∶11.3∶1≤1.31.1
12.0~15.5≥0.390.41≤50.048.35≤1.3∶11.3∶1≤1.31.2