The common measurement of the two-port network'input impedance is to measure the S parameter, then Z parameter is calculated by the relation of S and Z, finally the input impedance is gained by the Z.

目前测量相参激励下二端口网络输入阻抗常用的方法是，先用二端口网络分析仪测量网络的散射矩阵S，再将散射矩阵S转化为阻抗矩阵Z，最后求出不同相参激励下各端口的输入阻抗。

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