Coupling between two-conductor multi-layer shielded microstrip transmission line

Author

Elsherbeni, A.Z. ; Moumneh, B. ; Smith, C.E. ; Golestanian, H.

Author_Institution

Dept. of Electr. Eng., Mississippi Univ., University, MS, USA

fYear

1993

fDate

7-9 Mar 1993

Firstpage

6

Lastpage

10

Abstract

The quasi-static TEM mode of a shielded microstrip transmission line is analyzed. The transmission line consists of two perfectly conducting coplanar strips located between two ground planes. Four different dielectric regions are considered: two layers of substrates, a rectangular notch below the strips, and an overlay or a superstrate. The effects of the structure parameters of the shielded transmission line on the odd and even modes´ phase velocities and coupling capacitance are studied. Once the phase velocities are equalized, the design of distortionless lines is achievable. It is found that the presence of the shield allows the reduction of the interline spacing with minimum coupling. With the proper selection of the height of the shield and the separation distance between the strips, it is possible to equalize the phase velocities at more than one combination of the substrate heights

Keywords

capacitance; coupled mode analysis; electromagnetic shielding; microstrip lines; substrates; coupling capacitance; distortionless lines; interline spacing; overlay; perfectly conducting coplanar strips; phase velocities; quasistatic TEM mode; rectangular notch; shielded microstrip transmission line; substrates; superstrate; Boundary conditions; Capacitance; Coplanar transmission lines; Couplings; Dielectric substrates; Integral equations; Microstrip; Strips; Transmission line theory; Transmission lines;

fLanguage

English

Publisher

ieee

Conference_Titel

System Theory, 1993. Proceedings SSST '93., Twenty-Fifth Southeastern Symposium on

Conference_Location

Tuscaloosa, AL

ISSN

0094-2898

Print_ISBN

0-8186-3560-6

Type

conf

DOI

10.1109/SSST.1993.522731

Filename

522731