An equivalent circuit model for the coplanar waveguide step discontinuity

Author

Sinclair, C. ; Nightingale, S.J.

Author_Institution

THORN EMI Electronics Ltd., Crawley, UK

fYear

1992

fDate

1-5 June 1992

Firstpage

1461

Abstract

An approximate analytical model for the CPW (coplanar waveguide) step discontinuity is presented which includes a lumped shunt capacitance as the dominant effect. Good agreement is obtained with data from extensive 3-D field simulations, and verified by a limited number of measurements on alumina. The magnitude of the discontinuity is found to be smaller than indicated in previous work, but it is nevertheless of the same order as a microstrip step in a comparable situation. These effects need to be taken into account in any serious design, and the model presented, when incorporated into CAD (computer-aided design) circuit analysis programs, will allow rapid evaluation of performance.<>

Keywords

equivalent circuits; strip lines; waveguide theory; 3D-field simulations; CAD; CPW; alumina; circuit analysis programs; computer-aided design; coplanar waveguide; equivalent circuit model; lumped shunt capacitance; step discontinuity; Analytical models; Capacitance; Capacitive sensors; Conductors; Conformal mapping; Coplanar waveguides; Electromagnetic interference; Electromagnetic waveguides; Equivalent circuits; Waveguide discontinuities;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 1992., IEEE MTT-S International

Conference_Location

Albuquerque, NM, USA

ISSN

0149-645X

Print_ISBN

0-7803-0611-2

Type

conf

DOI

10.1109/MWSYM.1992.188286

Filename

188286