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。
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.
而这类天线可以等效成相参激励下二端口网络来进行输入阻抗的测量。
This type of antenna measurements can be translated into measuring the input impedance of two-port network.
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