skrf.media.freespace.Freespace.z0

Freespace.z0

Port Impedance

The port impedance is usually equal to the characteristic_impedance. Therefore, if the port impedance is None then this will return characteristic_impedance.

However, in some cases such as rectangular waveguide, the port impedance is traditionally set to 1 (normalized). In such a case this property may be used.

The Port Impedance can be either a number, array-like, or a function. If it is a function is must take no arguments. The reason to make it a function is if you want the Port Impedance to be dynamic, meaning changing with some attribute of the media. See __init__() for more explanation.

Returns :

port_impedance : numpy.ndarray

the media’s port impedance