差分散射参数测试:该文章主要讨论三个问题:1) 如何用单端矢量网络分析仪测量差分网络的散射参数;2)差分网络到单端网络转换时的共模干扰问题;3)双端网络双共轭匹配问题。 Abstract: Often we encounter this question that we need to evaluate one balance type component with single ended Vector Analyzer; this document will discuss this question. The value point of this article is that a new type S-parameter is discussed here to describe multi-port network, and use this S-parameter, we can easy to design matching circuit.