Quantifying numerical dispersion in non-orthogonal FDTD meshes

R Nilavalan, IJ Craddock, CJ Railton

Research output: Contribution to journalArticle (Academic Journal)peer-review

8 Citations (Scopus)


Numerical electromagnetic models such as FDTD are widely used for the design and analysis of structures, including antennas. Numerical dispersion is one of the main sources of error that degrade the accuracy of the results-for each structure of interest, the users of the model must attempt to generate a mesh that will avoid introducing high levels of dispersion. This is, however, especially difficult for non-orthogonal meshes since little information is available on the dispersion properties of the non-orthogonal FDTD algorithm on complex meshes. For the first time, the dispersion in realistic non-orthogonal FDTD models of microstrip structures is quantified directly through numerical simulations. A test structure is considered, discretised using a number of nonorthogonal mesh configurations, including single and multiple skew angles. A numerical analysis of reflections generated at the transition between two mesh regions with different skew angles is also presented. These results give a practical guide to mesh generation for users of the algorithm
Original languageEnglish
Pages (from-to)23-27
Number of pages5
JournalIEE Proceedings on Microwaves, Antennas and Propagation
Issue number1
Publication statusPublished - Feb 2002

Bibliographical note

Sponsorship: The authors would like to thank Prof. McGeehan and Prof. White for provision of facilities at the University of Bristol, and EPSRC for supporting this work


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