Benchmark problems for coupling and scattering with cavities of general form

P. D. Smith*, E. D. Vinogradova, S. B. Panin, Y. A. Tuchkin, S. V. Vinogradov

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Abstract

    The need for reliable and accurate prediction of electromagnetic wave coupling to, or scattering from, structures arises in many contexts. General-purpose computational codes have been extensively developed in the last few decades as computing power and resources have become widely available; they have had a significant impact in providing numerical solutions and insight into important coupling and scattering mechanisms. However, their accuracy, particularly for objects of some complexity, incorporating edges and re-entrant structures, can be difficult to assess. The strongly resonant features of cavity-backed apertures can present difficulties in accuracy and computational cost for such general-purpose numerical codes. This chapter presents a method of analytically regularizing the underlying integral equation governing diffraction from the structure, so that a well-conditioned system of equations is obtained. It generalizes the process of analytical regularization applied to cavities of spherical and other canonical shape [2, 3] in which the basic equations are transformed to a second-kind Fredholm matrix equation. It applies to axisymmetric bodies, and examples confirm that the condition number of the resultant system is well controlled even near-resonant frequencies and that solutions of guaranteed accuracy can be efficiently obtained.

    Original languageEnglish
    Title of host publicationUltra-Wideband, Short Pulse Electromagnetics 9
    Place of PublicationNew York
    PublisherSpringer, Springer Nature
    Pages47-53
    Number of pages7
    DOIs
    Publication statusPublished - 2010
    Event9th Conference on Ultra-Wideband, Short Pulse Electromagnetics, UWBSP 2008 - Lausanne, Switzerland
    Duration: 21 Jul 200825 Jul 2008

    Other

    Other9th Conference on Ultra-Wideband, Short Pulse Electromagnetics, UWBSP 2008
    CountrySwitzerland
    CityLausanne
    Period21/07/0825/07/08

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