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Öğe Approximate boundary relations on anisotropic sheets(2011) Polat B.Approximate boundary relations on general anisotropic sheets of arbitrary shape as well as the special case when they are backed by a perfect electrical conductor are investigated based on a generalization of the procedure introduced by Idemen in 1993 for uniaxially anisotropic planar sheets to general anisotropic and arbitrarily shaped surfaces. The ranges of validity of the approximations in the methodology are also tested numerically for the impedance boundary condition obtained in the case of a PEC backed uniaxially anisotropic sheet.Öğe A distributional investigation of point sources in classical electromagnetism(2012) Polat B.We provide a tutorial introduction to the distributional investigation of electromagnetic field behavior in free space using three generalized vector operators in presence of electrical and magnetic point sources in a systematic manner in increasing order of singularity.Öğe Electromagnetic scattering by inhomogeneous dielectric bodies modeled by cubic elements(2011) Zor Ö.; Polat B.The electric field distribution in an axially symmetric inhomogeneous dielectric body illuminated by a homogeneous plane wave is investigated by using a generalized analytical technique. The problem is formulated through the dyadic Green's function technique and solved by using the Method of Moments (MoM), which models an arbitrarily shaped dielectric body in terms of cubic elements. The singularity appearing in Green's functions is eliminated through a procedure which shapes the elements of MoM matrix into surface integrals that can be computed effectively. The numerical solutions are compared to analytical reference solutions for the special cases of homogeneous and concentric homogeneous spheres and the required size of the MoM matrix is observed to be quite small providing a rapid convergence. The convergence and the range of validity of the general analytical technique under consideration is tested for the first time for certain canonical problems of practical interest. © 2011 Chamber of Turkish Electric.Öğe Impedance boundary condition on a PEC backed uniaxially anisotropic sheet of arbitrary shape(2011) Polat B.Impedance boundary condition is investigated on a PEC backed uniaxially anisotropic sheet of arbitrary shape based on the distributional tools on an arbitrary regular surface. The investigation provides a generalization of the distributional procedure introduced by İdemen in 1993 for the case when the material sheet is of arbitrary shape and backed by a perfect electrical conductor. The availability of an impedance boundary condition is scrutinized for 8 different types of materials of practical interest. © 2011 IEEE.Öğe An implementation of king's green functions in thin wire scattering problems(2011) Zor Ö.; Polat B.We investigate electromagnetic scattering from metallic thin wire structures located over planar and spherical lossy dielectric half-spaces by applying Green's function formulation and method of moments in the resonance region and under "high contrast approximation" (HCA). For this purpose, in the calculations of the impedance matrix and the potential column of the moment system, we employ the Green functions of King valid for arbitrary range under HCA and the asymptotic (far field) Green functions for planar and spherical impedance surfaces delivered by Norton and Wait, respectively. For a verification of the developed codes, the current distributions obtained under plane wave illumination on the arms of a cross shaped thin wire structure are compared to the same results obtained by the commercial software SNEC™. Various illustrations for the scattered electrical field from a thin wire plate located over planar and spherical half-spaces are also presented. © 2011 ACES.Öğe Material invariant formulation of plane wave scattering by a moving dielectric half-space(2011) Polat B.In virtue of the axiomatic structure of a recently introduced Material Invariant Electromagnetic Field Theory, we introduce the general formulation of a scattering problem for arbitrarily moving material media and provide the solution for the canonical case of TM plane wave scattering by a dielectric half-space in uniform rectilinear motion. © 2011 IEEE.Öğe A numerical test of King's Green functions in thin wire scattering problems(2011) Zor Ö.; Polat B.The Green functions of R.W.P. King which are derived under high contrast approximation and valid for arbitrary range are tested in formulating electromagnetic scattering problems for metallic thin wire structures located over a planar lossy dielectric half-space. For a verification of the developed MATLAB™ codes which employ a Method of Moments formulation with pulse basis functions, the current distributions obtained under plane wave illumination on the arms of a cross shaped thin wire structure are compared to the same results obtained by the commercial software SNEC™. The developed codes have the ability to read data from NEC-2 type input files, while the analytical aspects of the formulation provides various capabilities to include terrain features and oceanographic parameters into any scattering scenario. © 2011 IEEE.Öğe Scattering problems for thin wire grid structures located over a simple lossy half space(2010) Zor Ö.; Polat B.In this work we investigate electromagnetic scattering from thin wire structures located over a lossy dielectric half-space by applying Green's function formulation and Method of Moments in the resonance region and under "high contrast approximation". The current distributions obtained under plane wave illumination on the arms of a cross shaped thin wire structure are compared to the same results obtained by the commercial software SNEC™.
