the characteristic impedance[s] of the network ports.
This property stores the characteristic impedance of each port of the network. Because it is possible that each port has a different characteristic impedance, that is a function of frequency, z0 is stored internally as a fxn array.
However because frequenty z0 is simple (like 50ohm),it can be set with just number as well.
| Returns : | z0 : numpy.ndarray of shape fxn
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