Coplanar waveguide with top and bottom shields in place of air-bridges

Author

Omar, A.A. ; Chow, Y.L.

Author_Institution

Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont., Canada

Volume

41

Issue

9

fYear

1993

fDate

9/1/1993 12:00:00 AM

Firstpage

1559

Lastpage

1563

Abstract

A convenient technique for the elimination of the coupled slot-line mode in coplanar waveguide (CPW) nonsymmetric circuits is proposed. This technique simply uses top and/or bottom ground plane shields and avoids the more costly airbridges. These shields are easy to fabricate; however, they may slightly affect the propagation of the CPW mode in the form of power leakage into the parallel plate TEM mode. This effect can be avoided by restricting operation to lower frequencies. Numerical comparisons between the effect of the shields and the airbridges on a CPW filter are presented

Keywords

Green´s function methods; S-parameters; band-stop filters; matrix algebra; microwave filters; shielding; waveguide theory; waveguides; CPW filter; CPW mode propagation; CPW nonsymmetric circuits; Galerkin method; S-parameters; band reject filter; bottom ground plane shields; coplanar waveguide; coupled slot-line mode elimination; matrix equation; numerical results; parallel plate TEM mode; power leakage; spatial Green functions; top ground plane shields; Bridge circuits; Coplanar waveguides; Coupling circuits; DC generators; Filters; Frequency; Helium; Impedance; Magnetic circuits; Magnetic shielding;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.245677

Filename

245677