Yazar "Apaydın, Gökhan" için listeleme

Calibration of three  dimensional parabolic  equation propagation models with the rectangular waveguide problem
Apaydın, Gökhan; Sevgi, Levent (IEEE, 201112)The SplitStep, FiniteElement, and FiniteDifferenceMethodbased threedimensional (3D) wavepropagation prediction simulators using the parabolic equation (PE) are calibrated against reference data derived from ... 
A canonical test problem for computational electromagnetics (CEM): propagation in a paralel  plate waveguide
Apaydın, Gökhan; Sevgi, Levent (IEEE, 201208)This paper aims to provide a tutorial on computational electromagnetics (CEM), and simple MATLAB codes for sophisticated investigation of analytical and wellknown numerical models. The problem of propagation inside a ... 
Comments on "propagation modeling over irregular terrain by the improved twoway parabolic equation method"
Özgün, Özlem; Apaydın, Gökhan; Kuzuoğlu, Mustafa; Sevgi, Levent (IEEE, 201407)The above paper [1] is about the twoway splitstep parabolic equation method (2WSSPE) over irregular terrain, and claims that they have developed the “improved” version of the 2WSSPE approach that has been proposed and ... 
Double tip diffraction modeling: finite difference time domain vs. method of moments
Uslu, Mehmet Alper; Apaydın, Gökhan; Sevgi, Levent (IEEE, 201412)Discontinuities such as tips and edges cause diffracted electromagnetic waves interact with objects. Twodimensional (2D) wedge with nonpenetrable boundaries is a canonical structure which has long been investigated ... 
EMC/EMI problems and diffraction modeling: Finite difference time domain vs. method of moments
Uslu, Mehmet Alper; Apaydın, Gökhan; Sevgi, Levent (IEEE, 201412)Edge and/or tip diffraction has long been investigated. Early attempts were analytical and called High Frequency Asymptotics (HFA). With the use of computers, numerical approaches have also appeared. In this study, two ... 
An FDTD  based waveguide filter simulator: calibration against analytical models
Apaydın, Gökhan; Sevgi, Levent (Wiley, 201307)A threedimensional (3D) finitedifference timedomain (FDTD) simulator is developed for the investigation of network (S) parameters of rectangular crosssection waveguide filters. The simulator is calibrated against ... 
FEMbased surface wave multimixedpath propagator and path loss predictions
Apaydın, Gökhan; Sevgi, Levent (IEEE, 2009)A finite element method (FEM)based surface wave propagation prediction simulator is developed. The simulator is tested and calibrated against analytical raymode models that also take into account the Millington recovery ... 
Groundwave propagation at short ranges and accurate source modeling
Apaydın, Gökhan; Sevgi, Levent (IEEE, 201306)Radiowave propagation models have long been used in longrange communication and/or radar systems. Different models use different sources. Observed and calculated results are therefore usually normalized, either against ... 
MATLABbased FEM  parabolicequation tool for pathloss calculations along multimixedterrain paths
Apaydın, Gökhan; Sevgi, Levent (IEEE, 201406)A novel FiniteElement Method  ParabolicEquation (FEMPE) based MATLAB tool is developed. This calculates the electromagnetic field strength and path loss for oneway, forward propagation over multimixed irregular terrain ... 
Method of moments (MoM) modeling for resonating structures: propagation inside a parallel plate waveguide
Apaydın, Gökhan; Sevgi, Levent (ACES, 2012)Method of Moments (MoM) modeling inside resonating structures is discussed and a novel approach called MultiMoM (MiMoM) is proposed. Propagation inside a twodimensional (2D) nonpenetrable parallel plate waveguide is ... 
A novel split  step parabolic  equation package for surface  wave propagation prediction along multiple mixed irregular  terrain paths
Apaydın, Gökhan; Sevgi, Levent (IEEE, 201008)A novel MATLAB (TM)based splitstep parabolicequation (SSPE) propagation package is introduced for the prediction of electromagnetic surfacewave attenuation along multiple mixed irregular and lossy paths. The impedance ... 
A novel two  way finite  element parabolic equation groundwave propagation tool: tests with canonical structures and calibration
Apaydın, Gökhan; Özgün, Özlem; Kuzuoğlu, Mustafa; Sevgi, Levent (IEEE, 201108)A novel twoway finiteelement parabolic equation (PE) (2WFEMPE) propagation model which handles both forward and backward scattering effects of the groundwave propagation above the Earth's surface over irregular terrain ... 
Numerical investigations of and path loss predictions for surface wave propagation over sea paths including hilly island transitions
Apaydın, Gökhan; Sevgi, Levent (IEEE, 201004)Surface wave propagation along multimixedpaths with irregular terrain over spherical Earth in twodimension (2D) is discussed. For the first time in the literature, sealandsea (island) transition problem including ... 
PETOOL: MATLAB  based oneway and two  way split  step parabolic equation tool for radiowave propagation over variable terrain
Özgün, Özlem; Apaydın, Gökhan; Kuzuoğlu, Mustafa; Sevgi, Levent (Elsevier, 201112)A MATLABbased oneway and twoway splitstep parabolic equation software tool (PETOOL) has been developed with a userfriendly graphical user interface (GUI) for the analysis and visualization of radiowave propagation ... 
Propagation modeling and path loss prediction tools for high frequency surface wave radars
Apaydın, Gökhan; Sevgi, Levent (TÜBİTAK, 2010)Propagation modeling and simulation approaches for the use of High Frequency Surface Wave Radar (HFSWR) are discussed. HFSWR uses vertically polarized surface waves along multimixed paths in the lower HF band (3 MHz  15 ... 
The split  step  fourier and finite  element  based parabolic  equation propagation  prediction tools: canonical tests, systematic comparisons and calibration
Apaydın, Gökhan; Sevgi, Levent (IEEE, 201006)Powerful propagationprediction tools, based on the splitstep Fouriertransform and the FiniteElementMethod (FEM) solutions of the parabolic equation (PE) are discussed. The parabolic equation represents oneway ... 
Two  way propagation modeling in waveguides with three  dimensional finite  element and split  step fourier  based pe approaches
Apaydın, Gökhan; Sevgi, Levent (IEEE, 2011)Twoway, threedimensional finite element and splitstep Fourierbased parabolic equation (PE) wave propagation prediction algorithms are developed, and MATLABbased simulators are introduced. The simulators are calibrated ... 
Twoway Fourier split step algorithm over variable terrain with narrow and wide angle propagators
Özgün, Özlem; Apaydın, Gökhan; Kuzuoğlu, Mustafa; Sevgi, Levent (IEEE, 201007)Helmholtz's wave equation can be approximated by means of two differential equations, corresponding to forward and backward propagating waves each of which is in parabolic wave equation (PWE) form. The standard PWE is very ... 
Twoway splitstep Fourier and finite element based parabolic equation propagation tools: Comparisons and calibration
Apaydın, Gökhan; Özgün, Özlem; Kuzuoğlu, Mustafa; Sevgi, Levent (IEEE, 201007)Parabolic equation (PE) has long been widely used in groundwave propagation modeling [1] because of its high capability in modeling atmospheric refraction and irregular terrain effects. It yields accurate electromagnetic ... 
Twoway splitstep parabolic equation algorithm for tropospheric propagation: Tests and comparisons
Özgün, Özlem; Apaydın, Gökhan; Kuzuoǧlu, Mustafa; Sevgi, Levent (IEEE, 201008)This paper introduces a twoway splitstep parabolic equation propagation tool (2WSSPE), which is capable of handling both forward and backward scattered waves during groundwave propagation over an irregular terrain, ...