Browsing by Author "Basdemir, Husnu Deniz"

Now showing 1 - 15 of 15

Citation - WoS: 4
Citation - Scopus: 4
An Analytical Solution for the Plane Wave Diffraction by a Resistive Half-Plane Residing at the Interface of Left and Right Handed Media
(Elsevier Gmbh, 2019) Basdemir, Husnu Deniz
The diffraction of waves by a resistive half-plane lying on the interface of left and right handed media is investigated in this study. Because of the anomalous refraction property of left handed media, shadow boundary shifts toward to the lower surface of the half-plane. In order to obtain the shifted boundary, diffracted waves are divided to subfields. Thus, obtained diffracted waves compensates the deficiency of geometries optics fields at the transition regions. The uniform version of waves is obtained by using the uniform theory of diffraction. The wave behaviors are examined numerically.
Citation - WoS: 5
Citation - Scopus: 5
Bessel Beam Diffraction by an Aperture in an Opaque Screen
(Hindawi Ltd, 2015) Basdemir, Husnu Deniz
The scattering of the Bessel beam by a circular aperture in an opaque screen is investigated by the geometrical theory of diffraction approach. The geometrical optics and diffracted and scattered fields are obtained. The effect of the aperture to the scattering process is analyzed. The uniform versions of field expressions are derived. The geometrical optics and diffracted and scattered fields are examined numerically.
Citation - WoS: 6
Citation - Scopus: 8
Diffraction of Waves by a Perfect Electromagnetic Conductor Half-Plane Between Isorefractive Media
(Springer, 2019) Basdemir, Husnu Deniz
In this study, diffraction of waves by a perfectly electromagnetic conductor half-plane which is lying at the boundary of isorefractive media is investigated. The diffracted field expressions are constructed by using the relation between scattered geometrical optics fields and the transition boundaries. The high frequency asymptotic expressions of diffracted fields reach infinite magnitude values at the transition boundaries. The uniform expressions of fields are obtained by using the uniform theory of diffraction method in order to obtain the finite magnitude values at the transition boundaries and the results are analyzed numerically for different set of parameters.
Citation - WoS: 6
Citation - Scopus: 6
Directive Line Source Scattering by a Half-Plane Between Two Isorefractive Media
(Elsevier Gmbh, Urban & Fischer verlag, 2017) Basdemir, Husnu Deniz
A perfectly conducting half-plane which is lying at the interface between two isorefractive media is investigated for a directive line source illumination. For this purpose, a directive line source is defined by passing a plane-wave from an aperture. Also, more suitable function than the Fresnel function is defined for cylindrical sources. The scattered field and its subfields are obtained by a new method. Consequently, all the mentioned fields are analyzed numerically. (C) 2016 Elsevier GmbH. All rights reserved.
Method of Total Fields for Diffraction Problems Between Different Media
(Ieee, 2019) Basdemir, Husnu Deniz
In this present study a new method which gives the scattered field by a canonical structure between two different media is introduced. This method is applied to the half-plane with soft boundary condition. The fields are examined numerically. Thus, numerical analysis showed that the proposed method is suitable for these kinds of problems.
Citation - WoS: 6
Citation - Scopus: 7
Modeling of an Interface Between Isorefractive Media by a Resistive Surface
(Optical Soc Amer, 2018) Basdemir, Husnu Deniz
In this study, the scattering of plane waves by a half-plane with different face impedances, which lie between isorefractive media, is analyzed. A new approach for the solution of this scenario is proposed. According to this proposal, the problem of isorefractive media and an impedance half-plane is modeled by a junction of resistive and impedance sheets. Thus the diffraction coefficient of the construction is obtained with the aid of the equivalent problem. The uniform expression of the diffracted waves is derived by the method of the uniform theory of diffraction. The scattered and diffracted waves are investigated numerically. (c) 2018 Optical Society of America
Citation - WoS: 3
Citation - Scopus: 4
Po and Ptd Approach To the Diffraction Problem by a Resistive Half-Plane
(Taylor & Francis Ltd, 2014) Basdemir, Husnu Deniz
Diffracted fields from a resistive half-plane were investigated by the method of physical optics (PO) and the physical theory of diffraction. The coefficient of the PO scattering integral was derived for the first time for the resistive half-plane. Uniform fringe field expressions were obtained in terms of the Fresnel functions. The resultant expressions of the fringe fields were plotted and analyzed numerically.
Citation - WoS: 3
Citation - Scopus: 2
Reply To the "comments on 'fringe Waves in an Impedance Half-Plane
(E M W Publishing, 2014) Basdemir, Husnu Deniz
Review on the Modified Theory of Physical Optics
(Ieee, 2018) Basdemir, Husnu Deniz; Basdemir, Husnu Deniz
In this review, modified theory of physical optics approach to the diffraction problem is revisited. The important aspects of the method are explained and steps for the usage of the method are revealed. Also, historical progress of the method is mentioned.
Citation - WoS: 10
Citation - Scopus: 10
Scattering of Evanescent Plane Waves by a Black Wedge at the Interface Between Isorefractive Media
(Ieee-inst Electrical Electronics Engineers inc, 2016) Basdemir, Husnu Deniz
The scattering of evanescent plane waves by a black wedge located at the interface of two isorefractive media is investigated in order to extend the results for the perfectly conducting half-plane case reported by Uslenghi (2013). The geometrical optics, in addition to the diffracted and scattered fields, are analyzed numerically. The effect of the isorefractive media on the diffracted field and the effect of the evanescent plane-wave excitation on the scattered field are also examined.
Citation - WoS: 3
Citation - Scopus: 3
Scattering of Inhomogeneous Plane Waves by a Truncated Cylindrical Cap
(Taylor & Francis Ltd, 2015) Basdemir, Husnu Deniz
Scattered fields of the inhomogeneous plane waves from a truncated cylindrical cap are obtained. Also the uniform diffracted fields are performed in terms of the Fresnel functions. Reflected and diffracted fields are obtained by using the physical optics and the geometrical theory of diffraction methods, respectively. All the mentioned results are plotted numerically for various numerical parameters.
Citation - WoS: 8
Citation - Scopus: 8
Scattering of Plane Waves by a Rational Half-Plane Between Dng Media
(Elsevier Gmbh, 2019) Basdemir, Husnu Deniz
Scattering of plane waves by a hard-soft half-plane which is lying between double negative material is investigated. The diffracted fields are determined by dividing the diffraction coefficient to four subfields for satisfying the boundary conditions. It is observed that the shadow boundary shifts towards to lower surface of the half-plane. Also geometric optics fields are determined by using the geometry of the problem. As a result, the behavior of the fields is investigated numerically.
Citation - WoS: 1
Citation - Scopus: 1
Scattering of Plane-Waves by an Impedance Half-Plane at the Interface Between Isorefractive Media
(Taylor and Francis Ltd., 2018) Basdemir, Husnu Deniz
The scattering of plane waves by an impedance half-plane located at the interface of two isorefractive media is investigated. The scattered field, in addition to the diffracted and geometrical optics fields, is analyzed numerically and compared to the scattered field of perfectly conducting half-plane. The effect of the isorefractive media on the scattered field is also examined. © 2017, © 2017 Informa UK Limited, trading as Taylor & Francis Group.
Citation - WoS: 12
Citation - Scopus: 12
Scattering of Waves by a Perfectly Conducting Wedge Residing at the Interface Between Two Isorefractive Media
(Ieee-inst Electrical Electronics Engineers inc, 2016) Basdemir, Husnu Deniz
Scattered field by a wedge that is surrounded by isorefractive media is analyzed. A series-based method is introduced and applied to the wedge problem with soft boundary condition. The fields are examined numerically. The numerical results show that the proposed method is suitable for analysis of these kinds of problems.
Citation - WoS: 1
Citation - Scopus: 2
Wideband Hexagonal Type Antenna Design for 5g Networks
(Ieee, 2017) Yildiran, Orcun; Başdemir, Hüsnü Deniz; Basdemir, Husnu Deniz; Elektronik ve Haberleşme Mühendisliği
In this paper, hexagonal type antenna for the next generation (5G) mobile networks is proposed. Both the microstrip feed line and coaxial feed techniques are used to feed the antenna. The best feed point location for both techniques is found to achieve the highest performance. The High Frequency Structural Simulator (HFSS 12.0) is used to simulate the antenna and find out the characteristics. The antenna performance characteristics such as VSWR, return loss, radiation pattern are obtained.