COMBINED DIFFERENTIAL AND COMMON-MODE SCATTERING PARAMETERS - THEORY AND SIMULATION

A theory for combined differential and common-mode normalized power waves is developed in terms of even and odd mode impedances and propagation constants for a microwave coupled line system. These are related to even and odd-mode terminal currents and voltages, Generalized s-parameters of a two-port are developed for waves propagating in several coupled modes, The two-port s-parameters form a 4-by-4 matrix containing differential-mode, common-mode, and cross-mode s-parameters, A special case of the theory allows the use of uncoupled transmission lines to measure the coupled-mode waves, Simulations verify the concept of these mixed-mode s-parameters, and demonstrate conversion from mode to mode for asymmetric microwave structures.