The scattering parameter expression of two port properties of impedance Z (in series connection) and admittance Y (in parallel connection) are discussed and their active RC model is presented.

讨论了用散射参数表达的串联阻抗Z和并联导纳Y的二端口特性，给出了它们的有源RC电路模型。

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Two PC can communicate to each other by COM port and you can change the serial port parameter with the program.

程序可以实现利用 PC机的两个 COM口实现异步通信，并能根据设置调整异步传行通信 参数。

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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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