Wide-band S-parameter extraction from FD-TD simulations for propagating and evanescent modes in inhomogeneous guides

This paper proposes a new method of S-parameter extraction from finite-difference time-domain simulations. Unlike the previously published methods, the present method extracts the frequency-dependent mode impedance and propagation constant directly from the three-dimensional simulations. This makes...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2003-08, Vol.51 (8), p.1920-1928
Main Authors: Gwarek, W.K., Celuch-Marcysiak, M.
Format: Article
Language:English
Subjects:
Analytical models
Circuit simulation
Computational modeling
Computer simulation
Cutoff frequency
Eigenvalues and eigenfunctions
Extraction
Finite difference method
Finite difference methods
Finite difference time domain method
Frequency bands
Impedance
Mathematical analysis
Microwaves
Propagation
Propagation constant
Scattering parameters
Wideband
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Summary:This paper proposes a new method of S-parameter extraction from finite-difference time-domain simulations. Unlike the previously published methods, the present method extracts the frequency-dependent mode impedance and propagation constant directly from the three-dimensional simulations. This makes it accurate and computationally effective in wide-band analysis. This paper provides examples of calculations including difficult cases of inhomogeneous or lossy structures, with the frequency band spanning below and above the cutoff frequency. Special attention is given to the S-parameter extraction for evanescent modes. It is shown that the available literature provides insufficient and sometimes confusing background in this regard. Thus, a new consistent theoretical background is presented.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2003.815265