FDTD characterization of evanescent modes-multimode analysis of waveguide discontinuities

Author

Navarro, Enrique A. ; Bordallo, Thamar M. ; Navasquillo-Miralles, Joaquín

Author_Institution

Dept. of Appl. Phys., Valencia Univ., Spain

Volume

48

Issue

4

fYear

2000

fDate

4/1/2000 12:00:00 AM

Firstpage

606

Lastpage

610

Abstract

In this paper, a finite-difference time-domain numerical dispersion relation for evanescent waves is derived, and its impact on the modeling accuracy is studied. The numerical evanescent constant is found to differ from the analytical one. As a result, a correction must be used to compute discontinuity parameters. This influences the reference plane chosen for the analysis of propagating modes. Moreover, on calculating multimode transmission and reflection coefficients, the dispersion for evanescent higher order modes is determinant. The dispersive relation is derived, discussed, and used to correct the evanescent constants for the multimode analysis of a waveguide discontinuity

Keywords

S-matrix theory; dispersion (wave); finite difference time-domain analysis; waveguide discontinuities; FDTD characterization; discontinuity parameters; evanescent modes; modeling accuracy; multimode analysis; numerical dispersion relation; propagating modes; reference plane; reflection coefficients; transmission coefficients; waveguide discontinuities; Boundary conditions; Central Processing Unit; Dispersion; Finite difference methods; Microwave devices; Microwave theory and techniques; Planar waveguides; Time domain analysis; Warranties; Waveguide discontinuities;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.842033

Filename

842033