What effect does rounding the corners have on diffraction from structures with corners?

Paul D. Smith, Audrey J. Markowskei

Research output: Chapter in Book/Report/Conference proceedingChapter

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Abstract

In studying electromagnetic wave diffraction, the choice of an appropriate canonical structure is significant in elucidating the dominant features of a scattering scenario. This study was originally motivated by the influence that the corners of buildings and their surface cladding might have on the wave propagation. When an integral equation approach is employed as the basis of numerical studies of the scattering of plane waves by an obstacle, a common technique for dealing with domains with corners is to round the corners. In order to clarify the effect of such corner rounding, this work examines the diffraction from cylindrical scatterers which possess corners, that is, points at which the normal changes discontinuously. Specifically we develop a numerical method for the scattering of an E- polarised plane wave by such cylindrical structures. We examine three different boundary conditions: soft, hard and an impedance loaded boundary condition, each enforced at all points on the cross-sectional boundary of the cylinder. We quantify the difference between test structures with corners and similar structures where the corners have been rounded to assess the impact on near- and far-field scattering, as a function of the radius of curvature in the vicinity of the rounded corner points.
Original languageEnglish
Title of host publicationAdvanced Electromagnetic Waves
EditorsSaad Osman Bashir
Place of PublicationRijeka, Croatia
PublisherInTech
Pages1-28
Number of pages28
ISBN (Print)9789535122050
DOIs
Publication statusPublished - 2015

Bibliographical note

Copyright the Author(s) 2015. Licensee InTech. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • scattering and diffraction
  • two-dimensional structures
  • impedance boundary condition
  • integral equations
  • geometrical theory of diffraction

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