WoS İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/8653
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Article Citation - WoS: 1Citation - Scopus: 2Modified Theory of Physical Optics Approach To Diffraction by an Interface Between Pemc and Absorbing Half-Planes(Lgep-supelec, 2021) Umul, Yusuf Z.The scattering of electromagnetic plane waves by an interface, located between perfect electromagnetic conductor and absorbing half-planes, is investigated. The perfect electromagnetic conductor half-plane is divided into perfect electric conductor and perfect magnetic conductor half-screens. The same decomposition is done for the absorbing surface. Then four different geometries are defined according to this approach. The scattered fields by the four sub-problems are obtained with the aid of the modified theory of physical optics. The resultant scattering integrals are combined in a single expression by using key formulas, defined for the perfect electromagnetic conductor and absorbing surfaces. The diffracted and geometric optics fields are obtained by the asymptotic evaluation of the scattering integral for large values of the wave-number. The behaviors of the derived field expressions are analyzed numerically.Article Citation - WoS: 1Citation - Scopus: 1Scattering of Waves by a Half-Screen With Different Face Impedances: Closed Form Series Solution(Taylor & Francis Ltd, 2013) Umul, Yusuf Z.A novel series solution is obtained for the scattering problem of waves by a half-plane with different face impedances. The impedance condition is expressed in terms of the sum of Dirichlet and Neumann conditions, multiplied by appropriate coefficients. The scattering problem of plane waves by an interface between two half-planes with different impedances is also investigated. The results are compared with the literature, numerically.Article Citation - WoS: 2Citation - Scopus: 3Wedge Diffraction in Terms of the Method of Physical Optics(Ieice-inst Electronics information Communications Eng, 2009) Umul, Yusuf Z.The method of physical optics is extended for wedge diffraction. The classical integral of physical optics is taken into account for the diffraction problem of plane waves by a conducting half-plane. The integral is decomposed according to the transmitted and reflected scattered waves. The sinusoidal term in the integrand is rewritten by considering the fact that the half-plane is a special case of the wedge. Two cases of soft and hard surfaces are examined and the uniform diffracted waves are obtained by the asymptotic evaluation of the integrals. The results are compared with the literature numerically.Article Citation - WoS: 9Citation - Scopus: 9Uniform Version of the Modified Theory of Physical Optics Based Boundary Diffraction Wave Theory(Taylor & Francis Ltd, 2008) Umul, Yusuf Z.The potential function of the modified theory of physical optics based boundary diffraction wave theory is made uniform by using the principles of the uniform theory of diffraction. The line integration of this new function along the edge contour gives the uniform diffracted fields which are finite for the transition regions of the diffraction geometry. The method is applied to the diffraction problem by the edge of a curved surface.Article Citation - WoS: 7Citation - Scopus: 8The Theory of the Boundary Diffraction Wave for Wedge Diffraction(Taylor & Francis Ltd, 2008) Umul, Yusuf Z.A new potential function, line integration which gives the edge diffracted fields, is constructed for wedge diffraction by using the method of modified theory of physical optics. The surface integrals are transformed into line integrals by the technique of asymptotic reduction. As an application of the novel potential function, the diffracted field is obtained for the geometry of a wedge for arbitrary incidence of plane waves.