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Yayın Analysis of layered media terminated with an impedance surface varying in lateral directions(Springer-Verlag Berlin, 2000) İdemen, Mehmet Mithat; Alkumru, AliDetermination of the constitutive parameters of a region from data provided by remote sensing is an extremely interesting and important topic from various points of view. In a large class of problems of this type, the region to be explored is not bounded but layered. When a layered region is electromagnetically penetrable from both sides, it can be explored through some already known methods dwelling on the analytical expressions of the reflection and refraction coefficients. But the situation is quite converse if both sides of the layered media is not accessible. This work is devoted to the case where the layered media to be explored is limited from one side by an impedance plane whose impedance varies in one direction while the other side is not accessible. It is assumed that the impedance of the plane boundary consists of n parts having constant Impedances. The atmosphere above the earth surface constitutes a typical example of such a configuration.Yayın Diffraction of two-dimensional high-frequency electromagnetic waves by a locally perturbed two-part impedance plane(2004) İdemen, Mehmet Mithat; Alkumru, AliAmong the wave propagation problems, those connected with half-spaces bounded by sectionally homogeneous boundaries take important place because they are motivated by microwave applications. If the boundary are of three or more parts, then the problem results, very frequently, in functional equations involving unknown functions, say Ψ+ (v), Ψ- (v) and P(v), which are regular in the upper half, lower half and whole of the complex v-plane, respectively, except at the point of infinity. A local (non-homogeneous) perturbation on a two-part boundary, which is of extreme importance from engineering point of view, gives also rise to a problem of this type. The aim of the present paper is to establish a method which is based on the elimination of the unknown functions Ψ+ (v) and Ψ- (v) to obtain an integral equation of the Fredholm type for the entire function P(v), which can be solved rather easily by numerical methods. The functions Ψ+ (v) and Ψ- (v) are then determined by the classical Wiener-Hopf technique.
