Yazar "Tabakcioglu M.B." seçeneğine göre listele

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    Analysis of amplitude and slope diffraction coefficients
    (2013) Tabakcioglu M.B.; Cansiz A.
    The diffraction mechanism is used for field prediction in both light and shadowed regions. Slope and amplitude diffraction coefficients are vital to predict the field strength at the receiver accurately. In this paper, amplitude and slope diffraction coefficients for one of the ray theoretical models, the slope uniform theory of diffraction with convex hull (S-UTD-CH) model, are analyzed. Moreover, diffraction coefficients are given for knife-edge and wedge structures. © TÜBİTAK.
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    Application of of ray tracing technique into S-UTD-CH model
    (Institute of Electrical and Electronics Engineers Inc., 2015) Tabakcioglu M.B.; Ayberkin D.
    To make higher accuracy predictions having less computation complexity, lower computation time, a lot of electromagnetic wave propagation models are developed. These models are classified into two classes, ray tracing based and numerical models. Computation complexity, computation time and accuracy of prediction of numerical model are high. On the contrary, computation complexity and computation time of ray tracing based model is lower. There is a tradeoff between computation time and accuracy. To predict the relative path loss at the receiver accurately, all ray paths have to be determined. In this study, after giving some brief information about some ray tracing based propagation models ray tracing software will be explained. © 2015 IEEE.
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    Application of S-UTD-CH model into multiple diffraction scenarios
    (2013) Tabakcioglu M.B.; Cansiz A.
    Propagation prediction models based on ray tracing in coverage estimation for digital broadcasting systems are compared. Geometrical Theory of Diffraction (GTD), Slope Uniform Theory of Diffraction (S-UTD), and Slope UTD with Convex Hull (S-UTD-CH) models are compared for computation time and propagation path loss. S-UTD-CH model is optimum model with respect to computation time and relative path loss. © 2013 Mehmet Baris Tabakcioglu and Ahmet Cansiz.
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    Application of S-UTD-CH model into multiple diffraction scenarios at 900MHz
    (Electromagnetics Academy, 2014) Tabakcioglu M.B.; Ayberkin D.
    In this study, propagation prediction models based on ray tracing in coverage estimation for broadcasting systems are compared with respect to computation time and accuracy. Uniform Theory of Diffraction (UTD), Slope Diffraction (S-UTD) and Slope UTD with Convex Hull (S-UTD-CH) models are compared for computation time and propagation path loss. Moreover in this study, effects of transmitter height to relative path loss at the receiver are analyzed. S-UTD-CH model is optimum model with respect to computation time and relative path loss.
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    Comparison and analyzing of propagation models with respect to material, environmental and wave properties
    (Applied Computational Electromagnetics Society (ACES), 2014) Tabakcioglu M.B.; Ayberkin D.; Cansiz A.
    This paper presents a study on a class of algorithms based on Uniform Theory of Diffraction (UTD) for multiple diffractions. Within this context Slope UTD with Convex Hull (S-UTD-CH) model based on Slope UTD and Fresnel zone concept was reviewed. S-UTD-CH model can be used for fast and more accurate field prediction for multiple diffractions in transition zone. An extensive simulation results for comparison of UTD based algorithms with respect to the computation time and accuracy was provided. Furthermore, the study shows how relative permittivity constant, conductivity and inner angle of wedge and polarization type affect the relative path loss. © 2014 ACES
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    Improvements on slope diffraction for multiple wedges
    (2010) Tabakcioglu M.B.; Kara A.
    This article proposes an improved slope uniform theory of diffraction model for fast and more accurate field prediction for multiple wedge diffractions in the transition zone. The proposed method is based on the slope uniform theory of diffraction and the Fresnel zone concept, called the slope uniform theory of diffraction with convex hull. The article also provides simulation results for the comparison of the uniform theory of diffraction based algorithms with respect to the computation time and accuracy. Copyright © Taylor & Francis Group, LLC.