Browsing by Author "Richardson, Micheal Peter"
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- ItemPhysical optics based methods for scattering analysis(Stellenbosch : Stellenbosch University, 2018-03) Richardson, Micheal Peter; Botha, Matthys M.; Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering.ENGLISH ABSTRACT: The physical optics (PO) approximation is often used in asymptotic, electromagnetic scattering analysis to calculate the induced current on a perfectly conducting surface, represented by a mesh. The multiple reflection physical optics (MRPO) method is the recursive application of the PO approximation. MRPO uses full, inter-segment visibility shadowing. Iterative physical optics is similar, except the shadowing is relaxed. Only half-space visibility is used for shadowing. The performance of these methods is investigated for a variety of test cases. The domain decomposition physical optics (DDPO) method is presented. It decomposes the geometry into two parts, a cavity and external geometry. The two geometries interact through an aperture, using equivalent sources. Thus, the shadowing can be calculated for the individual geometries and not as a whole. The equivalent sources and aperture interactions are validated. The performance of DDPO is investigated for various, simple test cases. All methods and results are presented in a two-dimensional, transverse magnetic context.