Mixed Mode S parameter Transfer Single Mode S parameter

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Bockelman, D.E.; Eisenstadt, W.R.; , "Combined differential and common-mode scattering parameters: theory and simulation," Microwave Theory and Techniques, IEEE Transactions on , vol.43, no.7, pp.1530-1539, Jul 1995
doi: 10.1109/22.392911
Abstract: 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
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=392911&isnumber=8938
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