WoS İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/8653
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Article Citation - WoS: 6Citation - Scopus: 6Scattering of Waves by a Soft-Hard Half-Plane Between Isorefractive Medium(Taylor & Francis Ltd, 2017) Umul, Yusuf ZiyaThe scattering of plane waves by a soft-hard half-plane residing between isorefractive medium is studied. The scattered geometrical optics fields are obtained by subtracting the initial geometrical optics fields from the total geometrical optics waves. The diffracted fields are determined by considering the structure of the scattered geometrical optics waves. The uniform expressions for the diffracted fields are derived. The behaviour of the total waves is investigated numerically.Article Citation - WoS: 4Uniform Asymptotic Theory for the Edge Diffraction of Cylindrical Waves(inst Engineering Technology-iet, 2017) Umul, Yusuf ZiyaThe uniform asymptotic theory of diffraction is reintroduced in terms of the Fresnel cylinder function for the diffraction problems of cylindrical waves. The transition function of the above theory, which compensates the discontinuities of the diffracted wave, is constructed according to the new function. The scattering problem of waves by a resistive half-plane is studied by the aid of the improved method. The uniform wave expressions are compared with the ones, obtained by the Fresnel integral at the near and far fields of the edge.Article Citation - WoS: 2Citation - Scopus: 2Scattering of Waves by a Planar Junction Between Resistive Half-Screen and Perfectly Electric Conducting Wedge(Taylor & Francis Ltd, 2018) Umul, Yusuf ZiyaThe diffraction of plane waves by a planar junction between a resistive half-plane and perfectly conducting wedge is investigated. First of all, the relation between the scattered geometrical optics waves and diffracted fields by a wedge is outlined. Then the scattered GO fields of the planar junction are obtained by subtracting the initial fields from the total geometrical optics waves. The diffracted waves by the junction is derived with the aid of the scattered GO waves' structure. The behaviour of the fields is analysed numerically.Article Citation - WoS: 11Citation - Scopus: 9Diffraction of Cylindrical Waves by a Perfectly Conducting Half-Screen: a Modified Theory of Physical Optics Solution(Wiley-blackwell, 2016) Umul, Yusuf Ziya; Ziya Umul, YusufThe scattering problem of waves, radiated by a line source, is investigated by the method of modified theory of physical optics. The solution is obtained for both of the Dirichlet and Neumann boundary conditions. Two dimensional modified theory of physical optics integral is considered, since the problem is symmetric according to one of the spatial coordinates. The scattering integral is directly evaluated and a new function is defined for the scattered fields. The mathematical properties of the function are studied. The total, geometrical optics and diffracted waves are analyzed numerically. (C) 2016 Wiley Periodicals, Inc. View this article online at wileyonlinelibrary.com.Article Citation - WoS: 7Citation - Scopus: 7Scattering Theory of Waves by a Perfectly Conducting Half-Screen Between Two Different Media(Wiley, 2015) Umul, Yusuf ZiyaThe scattering process of electromagnetic waves by a half-plane, located at the interface of two media with different dielectric constants, play an important role in the remote sensing applications and wireless technology for wave propagation over land-sea transition. In this article, the diffracted fields are obtained for such geometry with the aid of a physical optics-based method. A scattering integral is constructed for both of the media. The diffracted fields are obtained by the edge point technique and the constants, which were added to the diffraction coefficients, were evaluated from the continuity conditions across the transition of the two mediums. The uniform expressions of the diffracted waves are obtained and the results are investigated numerically. (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1928-1933, 2015Article Citation - WoS: 7Citation - Scopus: 7Extension of the Maliuzhinets Solution for the Resistive Half-Plane(Wiley-blackwell, 2012) Umul, Yusuf ZiyaThe solution, put forward by Maliuzhinets for the impedance half-plane, is extended for the diffraction problem of plane waves by a resistive half-plane. With this aim, the Wiener-Hopf solution of the same problem is taken into account. The resultant diffracted field expression is compared with the Wiener-Hopf solution of the problem numerically. (C) 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:777-780, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26626