circuit (skrf.circuit)

The Circuit class represents a circuit of arbitrary topology, consisting of an arbitrary number of N-ports networks.

Like in an electronic circuit simulator, the circuit must have one or more ports connected to the circuit. The Circuit object allows one retrieving the M-ports network, where M is the number of ports defined.

The results are returned in Circuit object.

Building a Circuit

Circuit(connections)	Creates a circuit made of a set of N-ports networks.
Circuit.Port(frequency, name[, z0])	Return a 1-port Network to be used as a Circuit port.
Circuit.SeriesImpedance(frequency, Z, name)	Return a 2-port network of a series impedance.
Circuit.ShuntAdmittance(frequency, Y, name)	Return a 2-port network of a shunt admittance.
Circuit.Ground(frequency, name[, z0])	Return a 2-port network of a grounded link.
Circuit.Open(frequency, name[, z0])	Return a 2-port network of an open link.

Representing a Circuit

Circuit.plot_graph(**kwargs)

Plot the graph of the circuit using networkx drawing capabilities.

Network Representations

Circuit.network	Return the Network associated to external ports.
Circuit.s	Return the global scattering parameters of the circuit.
Circuit.s_external	Return the scattering parameters for the external ports.
Circuit.s_active(a)	Return "active" s-parameters of the circuit's network for a defined wave excitation a.
Circuit.z_active(a)	Return the "active" Z-parameters of the circuit's network for a defined wave excitation a.
Circuit.y_active(a)	Return the "active" Y-parameters of the circuit's network for a defined wave excitation a.
Circuit.vswr_active(a)	Return the "active" VSWR of the circuit's network for a defined wave excitation a.
Circuit.port_z0	Return the external port impedances.

Voltages and Currents

Circuit.voltages(power, phase)	Voltages at internal ports.
Circuit.voltages_external(power, phase)	Voltages at external ports
Circuit.currents(power, phase)	Currents at internal ports.
Circuit.currents_external(power, phase)	Currents at external ports.

Circuit internals

Circuit.networks_dict([connections, min_nports])	Return the dictionary of Networks from the connection setup X.
Circuit.networks_list([connections, min_nports])	Return a list of unique networks (sorted by appearing order in connections).
Circuit.connections_nb	Return the number of intersections in the circuit.
Circuit.connections_list	Return the full list of connections, including intersections.
Circuit.nodes_nb	Return the number of nodes in the circuit.
Circuit.dim	Return the dimension of the C, X and global S matrices.
Circuit.intersections_dict	Return a dictionary of all intersections with associated ports and z0:
Circuit.port_indexes	Return the indexes of the "external" ports.
Circuit.C	Return the global scattering matrix of the networks.
Circuit.X	Return the concatenated intersection matrix [X] of the circuit.

Graph representation

Circuit.graph()	Generate the graph of the circuit.
Circuit.G	Generate the graph of the circuit.
Circuit.edges	Return the list of all circuit connections
Circuit.edge_labels	Return a dictionary describing the port and z0 of all graph edges.