通常我们用扫频仪测量最多的参数是输入匹配、增益、通频带和驻波比。除此以外，还可以测衰减常数、平均特性阻抗与介电常数等。这里我要介绍的是一种测量天馈线系统短路点或开路点的方法。既然这样我们就把馈线视为无损耗传输线，只研究它传输的入射波和反射波之间的叠加关系 The most commonly measured parameters we use with a sweeper are the input match, gain, pass band and VSWR. In addition, you can also measure the attenuation constant, the average characteristic impedance and dielectric constant. Here I am going to introduce a method of measuring the short-circuit point or open-circuit point of an antenna feeder system. In this case, we regard the feeder as a lossless transmission line, and only study the superposition of the incident and reflected waves it transmits