Browsing by Author "Apaydin,G."

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Citation Count: 0
Diffraction and fringe effects in EMC problems
(Institute of Electrical and Electronics Engineers Inc., 2017) Apaydin,G.; Sevgi,L.
Understanding the nature of electromagnetic (EM) wave interference is essential in EMC engineering. EM wave interference mainly includes the diffraction and fringe effects. This paper aims to visualize the diffraction and fringe effects using the canonical wedge structure. © 2017 IEEE.
Citation Count: 0
Diffraction at rounded edges
(Institute of Electrical and Electronics Engineers Inc., 2019) Apaydin,G.; Sevgi,L.
This study aims to visualize the diffraction effects of objects with rounded edges using method of moments (MoM). The comparison of scattering effects of wedges and trilateral cylinders are shown with and without rounded edges using fringe integral equations with physical theory of diffraction (PTD). © 2019 IEEE.
Citation Count: 7
Diffraction at rounded wedges: MoM modeling of PTD fringe waves
(Applied Computational Electromagnetics Society (ACES), 2017) Apaydin,G.; Sevgi,L.; Ufimtsev,P.Y.
The paper examines diffraction at rounded wedges with perfectly conducting faces. This topic was a subject of many publications which investigated mainly the total diffracted waves. In the present paper, we calculate specifically their fringe components to illustrate their sensitivity to the edge curvature. Such fringe waves provide substantial contributions to the scattered field in certain directions and represent a key element in extension of the physical theory of diffraction (PTD) for objects with rounded edges. © ACES.
Citation Count: 3
Finite difference time domain modeling of fringe waves
(Applied Computational Electromagnetics Society (ACES), 2017) Uslu,M.A.; Apaydin,G.; Sevgi,L.
A novel method is introduced for calculating fringe currents and fringe waves around the tip of a perfectly reflecting wedge under line source illumination. The time-domain fringe (non-uniform) currents are extracted with the finite-difference time-domain (FDTD) method. These currents are then fed into a free-space FDTD and fringe waves are excited. Alternatively, fringe waves are also obtained using the Green's function approach. The validation of the proposed method and the verification of the results are done against the physical theory of diffraction (PTD) as well as the method of moments (MoM). The factors affecting the accuracy are also discussed. © ACES.
Citation Count: 14
A novel wedge diffraction modeling using method of moments (MoM)
(Applied Computational Electromagnetics Society (ACES), 2015) Apaydin,G.; Sevgi,L.
Scattering from edges and/or tips (i.e., diffraction) has long been modeled using different approaches. Initially, it was handled analytically using high frequency asymptotics (HFA). Parallel to the development in computer technology diffraction has begun to be modeled using numerical approaches also. Here, method of moments (MoM) is used to model the canonical wedge scattering problem and a novel, generally applicable procedure is introduced to extract diffracted fields and diffraction coefficients. © 2015 ACES.
Citation Count: 1
Parabolic equation toolbox for radio wave propagation
(Institute of Electrical and Electronics Engineers Inc., 2015) Ozgun,O.; Apaydin,G.; Kuzuoglu,M.; Sevgi,L.
A parabolic equation toolbox (called PETOOL) has been developed in MATLAB with a user-friendly Graphical User Interface (GUI) for modeling radio-wave propagation over variable terrain and through homogeneous and inhomogeneous atmosphere (O. Ozgun, G. Apaydin, M. Kuzuoglu, L. Sevgi, Computer Physics Communications, 182, 2638-2654, 2011). The unique feature of the toolbox is that it implements both one-way and two-way Fourier split-step method to take account of both forward and backward propagating waves over variable terrain. © 2015 IEEE.
Citation Count: 10
The Two-Dimensional Nonpenetrable Wedge Scattering Problem and a MATLAB-Based Fringe Wave Calculator Testing Ourselves
(IEEE Computer Society, 2016) Apaydin,G.; Sevgi,L.
The 2015 IEEE Internat ional Conference on Antenna Measurements and Appl icat ions (CAMA 2015) was held in Chiang Mai, Thai land, 30 November2 December 2015. Most of our Administrative Committee members attended the conference. This new IEEE Antennas and Propagation Society (IEEE AP-S)-sponsored conference was hosted by General Chairs Dr. Monai Krairiksh and Dr. Christian Pichot; Cochair Dr. Prayoot Akkaraekthalin from King Monguts Institute of Technology, Ladkrabang, Bangkok; and Short Course Chair Dr. Sarawuth Chaimool from Udon Thani Rajabhat University, Thailand. © 2015 IEEE.