The stability of numerical approximations of the time domain current induced on thin wire and strip antennas

Penny J. Davies, Dugald B. Duncan, Barbara Zubik-Kowal

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We derive and analyse collocation approximations of retarded potential integral equations (RPIEs) arising as models of scattering of waves from thin wire and strip antennas. In particular we derive midline collocated and transversely averaged strip RPIEs and show how they are related to the thin wire exact kernel RPIE. We Fourier analyse the temporal stability of spatially exact piecewise constant and linear in time approximations of these three RPIEs. All three are stable when piecewise constant in time approximation is used, but only the transversely averaged strip approximation is stable with piecewise linear time approximation. Numerical results are presented for practical schemes that are piecewise constant or linear in time and space, and these are in close agreement with the predictions of the Fourier analysis. © 2004 IMACS. Published by Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)48-68
Number of pages21
JournalApplied Numerical Mathematics
Volume55
Issue number1
DOIs
Publication statusPublished - Sep 2005

Keywords

  • Retarded potential
  • Stability
  • Thin strip
  • Thin wire
  • Time domain

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