Browsing by Author "Uluışık, Çağatay"
Now showing items 1-19 of 19
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Analysis of periodic line arrays of phased dipoles with band-limited excitations
Uluışık, Çağatay (Wiley, 2016-05)Radiation from periodic line arrays of sequentially excited electric current dipoles is investigated in time domain. The time domain Floquet wave representations are reviewed for a semi-infinite line array. In this study, ... -
Antenna systems with beam forming and beam steering capabilities for HF skywave radars
Uluışık, Çağatay (TÜBİTAK, 2010)Radiation characteristics of linearly phased, periodic, planar dipole arrays, which can be used as transmitting/ receiving antenna systems for HF skywave radars, are investigated. Rectangular, triangular and trapezoidal ... -
DiffEq: A MATLAB-based discrete-time system simulator
Uluışık, Çağatay (IEEE, 2015-02)A MATLAB-based discrete-time system simulator (DiffEq) is introduced. This tool investigates linear constant-coefficient difference equations, which represent linear time-invariant finite-dimensional discrete-time systems. ... -
DigiComm: a MATLAB - based digital communication system simulator
Uluışık, Çağatay; Sevgi, Levent (IEEE, 2014-02)A simple digital communication virtual tool, DigiComm, is introduced. This tool visualizes the transmission of binary data in different channels using frequency-shift keying (FSK) and accessing the shared media via ... -
Doğrusal fazlı/sırayla uyarılan, periyodik dipol dizilerinin frekans ve zaman domeni karakteristikleri
Uluışık, Çağatay; Topuz, Ercan; Sevgi, Levent (İstanbul Teknik Üniversitesi, 2010-02)Doğrusal fazlı/sırayla uyarılan periyodik dipol dizilerinin frekans ve zaman domeni yanıtları, Floquet dalga ve eleman-eleman toplama gösterilimleri kullanılarak incelenmiştir. Her bir dipolün katkısının ayrı ayrı hesaplanıp ... -
A labVIEW-based analog modulation tool for virtual and real experimentation
Uluışık, Çağatay; Sevgi, Levent (IEEE, 2012-12)This tutorial discusses analog-modulation techniques with the LabVIEW-based AnalogMod package, developed for the illustration of different modulation types in undergraduate labs. The tool can generate and display the time- ... -
A labview-based virtual instrument for engineering education: a numerical fourier transform tool
Sevgi, Levent; Uluışık, Çağatay (TÜBİTAK, 2006)Engineering is based on practice. The minima of this practice should be given during the university education. This has become more and more comprehensive and expensive parallel to high-technology devices developed and ... -
A Matlab - based visualization package for complex functions and their mappings and integrals
Uluışık, Çağatay; Sevgi, Levent (IEEE, 2012-02)This paper aims to provide a tutorial on the visualization of complex functions. The MATLAB-based package ComplexGUI was prepared to illustrate mappings by elementary complex functions. The tool shows how user-defined ... -
A MATLAB-based transmission-line virtual tool: finite-difference time-domain reflectometer
Sevgi, Levent; Uluışık, Çağatay (IEEE, 2006-02)This article introduces a simple virtual tool, TDRMeter, for the investigation and visualization of time-domain pulsed voltage/current, traveling along a terminated finite-length transmission line, without and with faults ... -
A MATLAB-based two-dimensional parabolic equation radiowave propagation package
Sevgi, Levent; Uluışık, Çağatay; Akleman, Funda (IEEE, 2005-08)This article introduces a simple MATLAB radiowave propagation package, SSPE_GUI, for the visualization of EM propagation over non-flat terrain through an inhomogeneous atmosphere, for waves radiated by a horizontally ... -
A Matlab-Based virtual propagation tool: surface wave mixed-path calculator
Sevgi, Levent; Uluışık, Çağatay (Electromagnetics Acad, 2006-03-26)A new Matlab-Based, user-friendly virtual propagation tool (VPT) that can be used for multi-mixed path surface wave path loss calculations has been designed. Any multi-mixed-path surface wave propagation scenario may be ... -
A MATLAB-based visualization package for planar arrays of isotropic radiators
Sevgi, Levent; Uluışık, Çağatay (IEEE, 2005-02)This article introduces a simple MATLAB antenna package (ANTEN_GUI) for the visualization of the radiation patterns, beam-forming, and beam-steering capabilities of user-designed planar arrays of isotropic radiators. The ... -
Modeling and simulation strategies in wireless propagation and coverage planning
Uluışık, Çağatay; Sevgi, Levent (IEEE, 2005-06)This paper presents two-dimensional (2D) user-friendly, tailored with attractive and useful graphical user interfaces (GUI), Matlab propagation packages based on the classical knife-edge model and the parabolic equation ... -
Numerical modeling and simulation studies of 2D propagation over nonflat terrain and through inhomogeneous atmosphere
Uluışık, Çağatay; Sevgi, Levent (Springer, 2006)This paper introduces Matlab-based two dimensional (2D) virtual propagation tools (VT) which can be used to investigate EM propagation over user-specified nonflat terrain through inhomogeneous atmosphere. The VTs can be ... -
Radar cross section (RCS) modeling and simulation, part 1: a tutorial review of definitions, strategies, and canonical examples
Uluışık, Çağatay; Çakır, Gonca; Çakır, Mustafa; Sevgi, Levent (IEEE, 2008)Modeling and simulation strategies for radar cross section (RCS) prediction are reviewed, and a novel FDTD-based virtual RCS prediction tool is introduced in this two-part paper. Part 1 is reserved for a tutorial review. ... -
Some characteristics of radiation from linearly phased / sequentially excited periodic, rectangular arrays of dipoles
Uluışık, Çağatay; Topuz, Ercan; Sevgi, Levent (IEEE, 2008-06)Floquet wave and element-by-element summation representations are implemented to investigate the radiation from a periodic, rectangular array of linearly phased/sequentially pulsed dipoles in the frequency and time-domains. ... -
Time - domain investigations of periodic rectangular dipole arrays
Uluışık, Çağatay; Topuz, Ercan; Sevgi, Levent (IEEE, 2007-10-15)Radiation from large arrays of finite one- and two-dimensional periodic, linearly phased, electric current dipoles is investigated. The classical element-by-element summation representation is modified to speed up the ... -
A tutorial on bessel functions and numerical evaluation of bessel integrals
Uluışık, Çağatay; Sevgi, Levent (IEEE, 2008-12)This paper aims to provide a tutorial on Bessel functions, and especially on the numerical evaluation of Bessel integrals. Bessel integrals are asymptotically evaluated using high-frequency methods, such as the stationary-phase ... -
Web - based virtual laboratories for antenna arrays, radiowave propagation and filter design
Uluışık, Çağatay; Sevgi, Levent (IEEE, 2011-08)This tutorial explains in detail the creation of a Web-based application using the MATLAB Web Server (MWS) toolbox of MATLAB. It aims to enable readers who a re familiar with MATLAB but don't have Web-programming skills ...
