Leakage of the stripline dominant mode produced by a small air gap

Author

Nghiem, D. ; Williams, J.T. ; Jackson, D.R. ; Oliner, A.A.

Author_Institution

Dept. of Electr. Eng., Houston Univ., TX, USA

fYear

1992

fDate

1-5 June 1992

Firstpage

491

Abstract

It is demonstrated that a dominant complex improper (leaky) mode exists in general on a conventional stripline with a small air gap above the strip. This improper mode has a zero cutoff frequency, as does the proper mode. The improper (leaky) mode, rather than the proper mode, is the one that has fields resembling those of the conventional TEM (transverse electromagnetic) homogeneous stripline mode, and is therefore the mode that is expected to be more strongly excited by a common stripline feed. Its presence may cause spurious transmission-line effects along such stripline, because it leaks power and may therefore interact with other circuit components, as well as interfere directly with the fields of the proper mode. This spurious behavior has been demonstrated experimentally.<>

Keywords

strip lines; waveguide theory; TEM; air gap; common stripline feed; complex improper mode; homogeneous stripline mode; leakage; spurious transmission-line effects; stripline dominant mode; zero cutoff frequency; Air gaps; Dielectric materials; Dielectric substrates; Electromagnetics; Interference; Laboratories; Propagation constant; Stripline; Strips; Transmission lines;

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.1992.188021

Filename

188021