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Browsing Mühendislik Fakültesi by Author "Çankaya Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği"

Browsing Mühendislik Fakültesi by Author "Çankaya Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği"

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  • Propagation factor of partially coherent flat-topped beam array in free space and turbulent atmosphere 
    Yuan, Yangsheng; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya; Chen, Jun (Elsevier Science Ltd, 2012-05)
    Analytical expressions for the propagation factor of partially coherent radial flat-topped (FT) beam array in free-space and turbulent atmosphere are derived. Our formulae can be applied to study the beam propagation factors ...
  • Propagation factors of Hermite-Gaussian beams in turbulent atmosphere 
    Yuan, Yangsheng; Cai, Yangjian; Qu, Jun; Eyyuboğlu, Halil T.; Baykal, Yahya (Elsevier Science Ltd, 2010-11)
    Based on the extended Huygens-Fresnel integral and the second-order moments of the Wigner distribution function, an analytical formulae for the propagation factors (M-2-factors) of coherent and partially coherent one-dimensional ...
  • Propagation factors of laser array beams in turbulent atmosphere 
    Yuan, Yangsheng; Cai, Yangjian; Zhao, Chengliang; Eyyuboğlu, Halil T.; Baykal, Yahya (Taylor&Francis Ltd, 2010)
    The propagation factors of phased locked laser array beams of radial and rectangular symmetries in a turbulent atmosphere are investigated based on the extended Huygens-Fresnel integral and the Wigner distribution function. ...
  • Propagation of an Airy beam through the atmosphere 
    Ji, X.L.; Eyyuboğlu, Halil T.; Ji, Guangming; Xiaoling, Ji (Optical Soc Amer, 2013-01-28)
    In this paper, the effect of thermal blooming of an Airy beam propagating through the atmosphere is examined, and the effect of atmospheric turbulence is not considered. The changes of the intensity distribution, the ...
  • Propagation of Elegant Higher-Order Gaussian Beams In Turbulent Atmosphere 
    Wang, Fei; Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (Spie-Int Soc Optical Engineering, 2010)
    Propagation of elegant higher-order Gaussian beams in turbulent atmosphere is studied in detail. Analytical propagation formulae of elegant higher-order Gaussian beams in turbulent atmosphere are derived based on extended ...
  • Propagation of higher order Bessel-Gaussian beams in turbulence 
    Eyyuboğlu, Halil T. (Springer, 2007-07)
    The propagation characteristics of higher order Bessel-Gaussian beams travelling in turbulent atmosphere are investigated. Using extended Huygens-Fresnel principle, I formulated receiver plane intensity and solved it down ...
  • Propagation of various dark hollow beams through an optical system in turbulent atmosphere 
    Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (Elsevier Science, 2010-10)
    The propagation of a dark hollow beam (DHB) of circular, elliptical or rectangular symmetry through aligned and misaligned ABCD optical systems in turbulent atmosphere is investigated. Analytical propagation formulae for ...
  • Propagation properties of anomalous hollow beams in a turbulent atmosphere 
    Cai, Yangjian; Eyyuboğlu, Halil T.; Baykal, Yahya (Elsevier Science, 2008-11-01)
    Propagation of circular and elliptical anomalous hollow beams in a turbulent atmosphere is investigated in detail. Based on the extended Huygens-Fresnel integral, analytical formulae for the average irradiance of circular ...
  • Radiation force of coherent and partially coherent flat-topped beams on a Rayleigh particle 
    Zhao, Chengliang; Cai, Yangjian; Lu, Xuanhui; Eyyuboğlu, Halil T. (Optical Society of America, 2009-02-02)
    Propagations of coherent and partially coherent flat-topped beams through a focusing optical system are formulated. The radiation force on a Rayleigh dielectric sphere induced by focused coherent and partially coherent ...
  • Radiation of electromagnetic waves by a time-harmonic surface charge density 
    Umul, Yusuf Ziya (Elsevier GMBH, 2018-08)
    The radiation process of waves by a time harmonic electric charge density, located on the surface of a conducting sphere, is investigated. The current density is evaluated using the continuity equation. The scalar and ...
  • Radius of curvature of Bessel and modified Bessel Gaussian beams 
    Eyyuboğlu, Halil T.; Ji, Xiaoling (Elsevier Science Bv, 2013-07-01)
    We analyze the radius of curvature of Bessel Gaussian (BG) and modified Bessel Gaussian (mBG) beams. The study is based on the results of analytic derivation as well as those of the random phase screen approach. Our results ...
  • Radius of curvature variations for annular, dark hollow and flat topped beams in turbulence 
    Eyyuboğlu, Halil T.; Baykal, Yahya; Ji, X.L. (Springer, 2010-06)
    For propagation in turbulent atmosphere, the radius of curvature variations for annular, dark hollow and flat topped beams are examined under a single formulation. Our results show that for collimated beams, when examined ...
  • Receiver-aperture averaging of annular beams propagating through turbulent atmosphere 
    Kamacıoğlu, Canan; Baykal, Yahya; Yazgan, Erdem (Spie-Soc Photo-Optical Instrumentation Engineers, 2013-12)
    For an annular beam incidence, the power scintillation index in a weakly turbulent atmosphere is derived at the receiver plane, which has a Gaussian aperture. Employing this derivation, the receiver-aperture averaging ...
  • Rigorous expressions for the equivalent edge currents 
    Umul, Yusuf Ziya (2009)
    An exact form for the equivalent edge current is derived by using the axioms of the modified theory of physical optics and the canonical problem of half-plane. The edge current is expressed in terms of the parameters of ...
  • Sayısal (Dijital) Sinyal İşleme 
    Gazi, Orhan (2016)
    Dijital sinyal işleme üniversitelerin elektrik ve elektronik ve muadili bölümlerinde lisans düzeyinde verilen temel derslerden birisidir. Kitap, ders müfredatına uygun olarak hazırlanmıştır. Kitabın en önemli özelliği, ...
  • Scattered fields of conducting half-plane between two dielectric media 
    Umul, Yusuf Ziya; Yalçın, Uğur (Optical Soc Amer, 2010-07-10)
    We investigate the scattering process of plane waves by a conducting half-plane between two dielectric media by introducing novel boundary conditions, in terms of soft and hard surfaces. The cases of soft and hard half-planes ...
  • Scattering by an impedance half-plane: Comparison of the solutions of Raman/Krishnan and Maliuzhinets/Senior 
    Umul, Yusuf Ziya (2009)
    There are three approaches for the solution of the diffraction problem of plane waves by an impedance half-plane in the literature. The diffracted field expressions, obtained by the related methods, are compared numerically. ...
  • Scattering of a line source by a cylindrical parabolic impedance surface 
    Umul, Yusuf Ziya (Optical Soc Amer, 2008-07)
    The scattering of the radiated fields of a line source by a cylindrical parabolic reflector, which has impedance boundary conditions on its surface, is obtained by using the surface integrals of the modified theory of ...
  • Scattering of electromagnetic waves by an impedance sheet junction in anisotropic plasma 
    Umul, Yusuf Ziya (2020-12)
    The diffraction of electromagnetic plane waves by the edge discontinuity of an impedance sheet junction, which is located in an anisotropic plasma, is investigated. The problem is solved by the integral theory of diffraction. ...
  • Scattering of inhomogeneous plane waves by a resistive half-screen 
    Umul, Yusuf Ziya (Optical Soc Amer, 2013-12-01)
    The scattering process of inhomogeneous plane waves by a resistive half-plane is investigated by using the exact diffracted field expressions. The uniform field representations are obtained with the aid of the uniform ...