skrf.circuit.Circuit.s_active¶
- Circuit.s_active(a)[source]¶
Return “active” s-parameters of the circuit’s network for a defined wave excitation a.
The “active” s-parameter at a port is the reflection coefficients when other ports are excited. It is an important quantity for active phased array antennas.
Active s-parameters are defined by 1:
\[\mathrm{active}(s)_{mn} = \sum_i s_{mi} \frac{a_i}{a_n}\]- Parameters
a (complex array of shape (n_ports)) – forward wave complex amplitude (power-wave formulation 2)
- Returns
s_act – active s-parameters for the excitation a
- Return type
complex array of shape (n_freqs, n_ports)
References