Complex modes in boxed microstrip

Author

Railton, C.J. ; Rozzi, T.

Author_Institution

Sch. of Electr. Eng., Bath Univ., UK

Volume

36

Issue

5

fYear

1988

fDate

5/1/1988 12:00:00 AM

Firstpage

865

Lastpage

874

Abstract

A method is described for obtaining the propagation coefficients and field patterns of a large number of modes for microstrip with a minimum of computational effort. The method uses a discrete space-domain formulation to calculate a large number of higher-order modes in a way which leads to their fast location and which ensures that node modes are missed. This includes those pairs of modes with complex conjugate propagation constants of the type reported for finline, as well as the normal evanescent modes. In addition, the characteristic impedance of microstrip is efficiently calculated. The results presented are obtained using the generally accepted power-current definition and are in agreement with other published results

Keywords

strip lines; waveguide theory; boxed microstrip; characteristic impedance; complex conjugate propagation constants; computational effort; discrete space-domain formulation; evanescent modes; field patterns; power-current definition; propagation coefficients; Coupling circuits; Equations; Finline; Frequency; Helium; Impedance; Microstrip; Microstrip filters; Microwave filters; Moment methods; Propagation constant; Scattering parameters; Strips;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.3606

Filename

3606