扫频反射系数调试的一种实现方法

现阶段的驻波扫频测量调试大多采用网络分析仪,但是对器件进行驻波扫频调试时,特别是调试时间较长的情况下,可以用扫频反射计,所用设备为一台高方向性定向耦合器、一台精密衰减器和一个标准失配负载或全反射短路负载;在信号源的输出定标很准确的情况下,可以不用精密衰减器调节衰减量,改为直接调节信号源的输出电平,设定出所需反射系数进行器件的反射系数调试,此时所用设备少,在实验室内很容易实现.笔者对此时装置的不确定度进行了分析,结果表明,采用短路负载来设定反射系数效果会好得多.

A simple method of swept-frequency testing reflection coefficients

At present, we usually use network analyzer to sweep\|frequency test and measure the VSWR of DUT. But when we sweep\|frequency debug VSWR of DUT, especially when debugging may need a long time, we can use reflectometer. The instruments we used is a sweeping source, a high directional coupler, a precise attenuator and a standard mismatched load or Terminal\|short Load. If the accuracy of signal source output is very good, precise attenuator is not necessary, the source output level can be modified. In that condition, the instruments used are simple and easily realized in lab. According to the result of uncertainty analysis, using the Terminal\|short Load to set up reflection\|coefficient is much better.