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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The device parameter as well as resonance frequency, mechanical quality factor and work band width were determined by the equivalent circuit input impedance admittance circle diagram.

分析压电式超声波换能器的等效电路，并由等效电路输入阻抗的导纳圆图确定了换能器的元器件参数以及谐振频率、机械品质因数和工作带宽等特征参量。

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