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Combined differential and common-mode scattering parameters: theory and simulation

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2 Author(s)
Bockelman, D.E. ; Motorola Radio Products Appl. Res., Plantation, FL, USA ; Eisenstadt, W.R.

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

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:43 ,  Issue: 7 )