摘要
天线的远场辐射方向图(幅度图)在实际天线测量中应用极其普遍,而在一般的资料中很少论及相位特性以及相位和幅度的相互关系,该文对远场的相位以及相位和幅度之间的相互影响作了比较深入的分析,在该文中比较详细地分析了远场相位的理论与实际偏差,及引起这种相位误差的来源和测量方式,这对天线测量及评定天线的性能具有一定的理论和实际参考意义,该文也给出了佘山25m天线的测量结果。由于射电天文望远镜通常为圆形,且工作于信号的远场区域,该文就远场区的表达式在圆形口径面的情况下用标量衍射的手段作了一定的推导。
The application of the far field radiate pattern is popular in the process of actual antenna measurement. In this paper,the relationship between the phase and amplitude of far field which is seldom discussed in other documents was described in detail. The theory and actual deviations of the far field phase were detailed. And the source of the deviations and measurement method are also described. All are helpful to antenna measurement and determination of antennas performance. The result of the measurement ...
出处
《中国科学院上海天文台年刊》
2008年第1期94-106,共13页
Annals Shanghai Astronomical Observatory Chinese Academy of Sciences
关键词
天线
口径面
相位
幅度
远场
方向图
衍射
antenna — aperture — phase — amplitude — far field — pattern — diffraction
