skrf.circuit.Circuit.y_active

Circuit.y_active(a)[source]

Return the “active” Y-parameters of the circuit’s network for a defined wave excitation a.

The “active” Y-parameters are defined by:

\[\mathrm{active}(y)_{m} = y_{0,m} \frac{1 - \mathrm{active}(s)_m}{1 + \mathrm{active}(s)_m}\]

where \(y_{0,m}\) is the characteristic admittance and \(\mathrm{active}(s)_m\) the active S-parameter of port \(m\).

Parameters:: a (complex array of shape (n_ports)) – forward wave complex amplitude
Returns:: y_act – active Y-parameters for the excitation a
Return type:: complex array of shape (nfreqs, nports)