the scattering parameter matrix [1].
s-matrix is a 3 dimensional numpy.ndarray which has shape fxnxn, where f is frequency axis and n is number of ports. Note that indexing starts at 0!, so s11 can be accessed by taking the slice s[:,0,0].
Returns : | s : complex numpy.ndarry of shape fxnxn
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References
[1] | http://en.wikipedia.org/wiki/Scattering_parameters |