Application of the Compensation Theorem in the Development of the Scattering Parameters
David B. Geselowitz · IEEE Transactions on Education · 1971
The compensation theorem relates the change in current when an impedance is added in a loop to the current that existed originally. It is shown that the voltage scattering variables may be defined in terms of the current change and the original current. The compensation theorem may then be used to determine the scattering matrix.