Öztürk, Alper Kürşat2016-01-082016-01-082002http://hdl.handle.net/11693/15686Ankara : The Department of Electrical and Electronics Engineering and the Institute of Engineering and Science of Bilkent University, 2002.Thesis (Master's) -- Bilkent University, 2002.Includes bibliographical references leaves 59-58A computer program which uses the Physical Theory of Diffraction (PTD) method to calculate the Radar Cross Section (RCS) of perfectly conducting targets with arbitrary shape is developed. Given an arbitrary surface, it is first meshed using planar triangles. The area of each triangle is restricted to be smaller than 0.005λ 2 in order to obtain a good approximation to the actual surface. After meshing, Physical Optics (PO) surface integral is numerically evaluated over the whole surface. If the surface has edges or wedges, diffractions originating from these edges play a significant role in the overall scattered field. This part of the diffracted field is calculated using PTD-EEC method. Calculation of the edge currents is made possible by canonically modelling the arbitrary-shaped edge. If the surface of the scatterer has thin wires attached to it, then the thin wire scattering formulation in the literature is applied. Expressions for scattering mechanism on a straight wire are based on diffraction, attachment, reflection and launch. The results get sufficiently accurate especially for electrically large bodies.xii, 59 leaves, tables, graphs, 30 cmEnglishinfo:eu-repo/semantics/openAccessPhysical Theory of Diffraction (PTD)Triangular Surface MeshingPhysical Optics (PO)Physical Theory of Diffraction-Equivalent Edge Currents (PTD-EEC)Radar Cross SectionScattering by Thin WiresQC415 .O98 2002Diffraction.Physical optics.Optics.Mathematical physics.Spectral theory.Optical measurements.Thesis