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A new technique for the stable incorporation of static field solutions in the FDTD method for the analysis of thin wires and narrow strips

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)1091 - 1096
Number of pages6
JournalIEEE Transactions on Microwave Theory and Techniques
Journal issue8
StatePublished - Aug 1998


The behavior of the fields around many common objects (e.g., wires, slots, and strips) converges to known static solutions. Incorporation of this a priori knowledge of the fields into the finite-difference time-domain (FDTD) algorithm provides one method for obtaining a more efficient characterization of these structures. Various methods of achieving this have been attempted; however, most have resulted in unstable algorithms. Recent investigations into the stability of FDTD have yielded criteria for stability, and this contribution for the first time links these criteria to a general finite-element formulation of the method. It is shown that the finite-element formulation provides a means by which FDTD may be generalized to include whatever a priori knowledge of the field is available, without compromising stability. Example results are presented for extremely narrow microstrip lines and wires.

Additional information

Publisher: Institute of Electrical and Electronics Engineers, Inc. (IEEE) Rose publication type: Journal article Sponsorship: The authors would like to thank Prof. J.P. McGeehan for provision of facilities at the Centre for Communications Research, University of Bristol, Bristol, U.K. Terms of use: Copyright © 1998 IEEE. Reprinted from IEEE Transactions on Microwave Theory and Techniques. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

    Research areas

  • electromagnetic analysis, FDTD methods, Galerkin method, finite-element methods

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