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
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