WoS İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/8653
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Article Propagation and Diffraction of Surface Plasmons on a Resistive Half-Plane(Elsevier Gmbh, 2020) Umul, Yusuf ZiyaThe propagation, radiation and diffraction characteristics of surface plasmons, on a discontinuous dielectric layer, are investigated. The layer is modeled by a resistive surface. The physical optics based formulation of the surface waves is taken into account. The physical optics integral includes the propagating and diffracting fields. These wave components are evaluated asymptotically and their behaviors are studied numerically.Article Citation - WoS: 2Citation - Scopus: 2Diffraction of Electromagnetic Waves by a Resistive Half-Plane in Magneto-Ionic Plasma(Wiley-v C H verlag Gmbh, 2020) Umul, Yusuf ZiyaThe interaction of magnetic polarized electromagnetic wave with a resistive half-plane in magneto-ionic plasma is investigated. The method of transition boundary is used for the evaluation of the diffracted wave. The excitation of surface waves is examined in the medium and their diffracted fields are derived by using the diffraction theory for grazing incidence. The uniform field expressions are obtained with the aid of the uniform theory for evanescent waves. The behaviours of the derived scattered waves are studied numerically.Article Citation - WoS: 1Citation - Scopus: 1Interaction of Electromagnetic Waves by a Cylindrical Parabolic Mesh Reflector(Elsevier Gmbh, 2019) Umul, Yusuf ZiyaA cylindrical parabolic reflector, composed of mesh grid, is modeled by a resistive surface. The analysis of the scattered waves is performed by the physical optics integral, which was developed for resistive surfaces. The integral is evaluated asymptotically for large values of the wave-number in high-frequencies. The geometrical optics and diffracted fields are obtained by the methods of stationary phase and edge point respectively. The uniform forms of the diffracted waves are derived. The total wave and its components are investigated numerically for different values of surface resistivity.Article Citation - WoS: 6Citation - Scopus: 7Diffraction by a Planar Junction Between Resistive and Perfect Electromagnetic Conductor Half-Screens(Elsevier Gmbh, 2019) Umul, Yusuf ZiyaThe interaction of plane electromagnetic waves by a planar junction between resistive and perfect electromagnetic conductor half-planes is investigated. First of all the initial waves for a whole resistive plane is evaluated. Then the scattered geometric optics fields are obtained from the difference of the total geometric optics and initial waves. The diffracted fields are evaluated with the aid of a relation between the scattered geometric optics and diffraction fields at the transition boundaries. It is found that the interaction between the two half-screens occur only for the z-polarized electric fields.Article Wave Diffraction by Material Half-Planes(Elsevier Gmbh, Urban & Fischer verlag, 2017) Umul, Yusuf ZiyaThe diffraction of E-polarized electromagnetic waves by resistive and conductive half planes is studied. The solution of Maliuzhinets for the scattering problem of plane waves from an impedance half-screen is taken into account. The diffracted fields from the resistive and conductive half-planes are obtained by using a relation between the scattered waves from material surfaces. The integrals ofscattering are also constructed in the complex plane. The resultant field expressions are compared with the literature numerically. (C) 2016 Elsevier GmbH. All rights reserved.Article Citation - WoS: 7Citation - Scopus: 8Diffraction of Waves by a Planar Junction Between Perfectly Absorbing and Resistive Sheets(Elsevier Gmbh, Urban & Fischer verlag, 2018) Umul, Yusuf ZiyaThe scattering of plane waves by a planar junction between perfectly absorbing and resistive half-planes is studied. The scattered geometrical optics fields are evaluated from the difference of the total geometrical optics and initial fields. The diffracted waves by the junction are obtained with the aid of a relation between the scattered geometrical optics and diffracted fields. The uniform expressions of the diffraction fields are derived by using the uniform theory of diffraction. The behaviors of the total field and its components are analyzed numerically. (C) 2018 Elsevier GmbH. All rights reserved.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: 1Citation - Scopus: 1Physical Optics Based Simple Expressions for Diffracted Waves by Transmissive Half-Planes(Elsevier Gmbh, Urban & Fischer verlag, 2018) Umul, Yusuf ZiyaThe diffracted fields by resistive and conductive half-screens, which transmit a portion of the incident wave and reflect the remaining part, are expressed in terms of simple expressions that are based on the diffraction coefficient of an impedance half-plane. Also alternative representations are derived for the diffracted fields and their effects are studied for different values of surface parameters. The results are examined numerically. (C) 2018 Elsevier GmbH. All rights reserved.Article Wave diffraction by material half-planes(Elsevier GMBH, 2017) Umul, Yusuf ZiyaThe diffraction of E-polarized electromagnetic waves by resistive and conductive half planes is studied. The solution of Maliuzhinets for the scattering problem of plane waves from an impedance half-screen is taken into account. The diffracted fields from the resistive and conductive half-planes are obtained by using a relation between the scattered waves from material surfaces. The integrals ofscattering are also constructed in the complex plane. The resultant field expressions are compared with the literature numerically.Article Citation - WoS: 15Citation - Scopus: 13Diffraction of Line Source Field by a Resistive Half-Plane Between Isorefractive Media(Springer, 2017) Umul, Yusuf ZiyaThe scattering process of cylindrical waves by a resistive half-plane, residing at the interface of isorefractive media, is investigated. The uniform expression of the diffracted cylindrical waves by a resistive half-screen is obtained for a single medium. Then the initial fields are found for an interface between isorefractive media. The scattered geometrical optics waves are derived by subtracting the initial fields from the total geometrical optics waves when the resistive half-plane exists at the interface. The diffracted fields are determined by using the scattered geometrical optics waves. The behavior of the resultant waves is analyzed numerically.