矢网在大型天线罩传输损耗测量中的应用研究

摘要

T he insert loss is one of the most critical considerations in evaluating the antenna ra‐dome‐performances .In this paper ,the scattering coefficients between transmitting and receiv‐ing antennas are derived ,based on the theory of two‐port scattering network .The theory and approach to determine the insert loss of a radome using vector network analyzer is illustrated . The insert loss is obtained by comparing the scattering parameters of the antenna system with or without the radome .The measurement procedure is presented in detail .An example of measuring a radome for 7 .2m dish at X band is given ,and test results agree with the engineer‐ing densign requirement .This method is of great application value in large antenna radome test .%传输损耗是天线罩的重要性能指标之一。基于两端口网络散射参数理论，推导了收发天线之间的功率方程的散射参数表达式。阐述了利用矢量网络分析仪和标准喇叭测量天线带罩和不带罩情况下的散射传输参数，从而确定天线罩传输损耗的原理和方法，简述了测量的方法程序。给出了某工程应用的X波段7．2m天线罩的插入损耗测量结果，测试结果满足工程设计要求。该方法在大型整体天线罩测量中具有重要的应用价值。