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

Davies, P.J. and Duncan, D.B. and Zubik-Kowal, B. (2005) The stability of numerical approximations of the time domain current induced on thin wire and strip antennas. Applied Numerical Mathematics, 55 (1). pp. 48-68. ISSN 01689274

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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.

Item type: Article
ID code: 2224
Keywords: stability, retarded potential, time domain, thin wire, thin strip, numerical mathematics, Physics, Computational Mathematics, Applied Mathematics, Numerical Analysis
Subjects: Science > Physics
Department: Faculty of Science > Mathematics and Statistics
Unknown Department
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 22 Nov 2006
    Last modified: 04 Sep 2014 12:54
    URI: http://strathprints.strath.ac.uk/id/eprint/2224

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