测量高方向性定向耦合器参数的关键,是测量其方向性,而测量方向性的关键是测量隔离度。由于负载的回波损耗与方向性基本相当,所以负载不理想对隔离度测量所带来的误差不容忽略。通过推导,得出了隔离度测量值与隔离度真值及负载反射系数的关系。提出了利用计算机进行曲线拟合,消除负载不理想所带来的误差,从而准确测得其隔离度的力法。通过实际测量,并对测得的数据进行分析,说明这一方法是可行的,也是可靠的。 The key to measuring high-directional directional coupler parameters is to measure their directivity, and the key to measuring the directivity is to measure the isolation. Since the return loss of the load is basically the same as that of the directivity, the load is not ideal. The error caused by the isolation measurement can not be neglected. Through the derivation, the relationship between the measured value of the isolation and the true value of the isolation and the reflection coefficient of the load is obtained. The force method of using computer to curve fitting and eliminating the error caused by the unpleasant load is proposed. Through the actual measurement, and the measured data analysis shows that this method is feasible and reliable.