Definition:  a square array of complex numbers consisting of the amplitude transmission factors and the amplitude reflection factors at the ports of a multiport structure
NOTE – The scattering matrix is the array of the coefficients of the linear equations which express the normalized complex wave amplitudes of the transmitted wave and the reflected wave at each port 1, 2, i, ... n considered as an output port in terms of the normalized complex wave amplitudes of the incident waves to the ports 1, 2, j, ... n considered as input ports.
