Numerical computation of diffraction coefficients
- 1 January 1987
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Antennas and Propagation
- Vol. 35 (1) , 53-61
- https://doi.org/10.1109/tap.1987.1143971
Abstract
Direct numerical methods are explored for the computation of diffraction coefficients for a wide class of canonical structures. Although these canonical structures are infinite or semi-infinite, the initial computations are performed on finite bodies. Extraction of the desired coefficient therefore necessitates the elimination of radiation from extraneous diffraction centers. This is accomplished by a variety of techniques including current windowing, tapered resistivity, and screening by conducting shields. Singularities at shadow boundaries are derived via physical optics (PO). The procedure is elucidated through a number of examples for which analytic results are available for comparison. These include the perfectly conducting half-plane, wedge, rounded wedge, and grooves in a ground plane. Computed diffraction coefficients for lossy dielectric wedges are applied within the context of geometrical theory of diffraction (GTD) to the computation of diffraction from a triangular prism and the results are in satisfactory agreement with those of the method of moments (MM).Keywords
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