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IEEE Transactions on Microwave Theory and Techniques
Volume 48 Number 4, April 2000

Table of Contents for this issue

Complete paper in PDF format

FDTD Characterization of Evanescent Modes-Multimode Analysis of Waveguide Discontinuities

Enrique A. Navarro, Member, IEEE Thamar M. Bordallo and Joaquín Navasquillo-Miralles

Page 606.

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.

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