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

Author

Bockelman, David E. ; Eisenstadt, William R.

Author_Institution

Motorola Radio Products Appl. Res., Plantation, FL, USA

Volume

43

Issue

7

fYear

1995

fDate

7/1/1995 12:00:00 AM

Firstpage

1530

Lastpage

1539

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

Keywords

S-parameters; coupled mode analysis; microwave circuits; two-port networks; asymmetric microwave structures; common-mode scattering parameters; coupled-mode waves; cross-mode s-parameters; differential scattering parameters; even mode impedances; microwave coupled line system; normalized power waves; odd mode impedances; propagation constants; two-port s-parameters; uncoupled transmission lines; Couplings; Impedance; Microwave propagation; Microwave theory and techniques; Power transmission lines; Propagation constant; Scattering parameters; Transmission line matrix methods; Transmission line theory; Voltage;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.392911

Filename

392911