1,721,189 research outputs found
A review of discrete solutions of poisson, laplace, and wave equations
No full textSevgi, Levent (Dogus Author)One- and two-dimensional discrete solutions of Poisson, Laplace, and wave equations are given in this tutorial. The terms wave propagation and numerical propagation are discussed. Simple MATLAB scripts are also supplied.IEEE Antennas and Propagation Societ
Design of a novel microstrip electromagnetic bandgap (EBG) structure
No full textSevgi, Levent (Dogus Author)This paper presents the design, simulation, and experimentation of a novel low-cost small-size high-performance microstrip (MS) electromagnetic bandgap (EBG) structure for MIMIC applications. The simulations and measurements confirm that the stopband characteristics can be easily controlled by changing the stub lengths and the interstub gap
Validation, verification and calibration in numerical electromagnetics : Canonical tests and comparisons
No full textSevgi, Levent (Dogus Author)Modeling and numerical simulation in electromagnetics is discussed in this paper with emphasize placed on validation, verification and calibration. Canonical examples from antennas, propagation to microstrip circuits are presented. Tests against measurements, when available, are also presented.IEEE,IEEE Electromagnetic Compatibility Society,International Union of Radio Science, URSI,Research-and-production Enterprise "Proryv
Modeling and simulation strategies in wireless propagation and coverage planning
No full textUluışık, Çağatay (Dogus Author) -- Sevgi, Levent (Dogus Author)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 method that can handle realistic propagation scenarios with non-flat, arbitrarily-designed and user-selected terrain profiles. Any 2D propagation scenario may be built by the user, and field vs. range and/or height profiles can be simulated
A double-arm generic microstrip electromagnetic bandgap structure with bandpass and bandstop characteristics
No full textSevgi, Levent (Dogus Author)A novel generic microstrip structure that can be used as both bandstop and bandpass filters is introduced in this paper. The design steps, numerical simulations and experimentations are briefly discussed. Examples of microstrip electromagnetic bandgap (EBG) and bandpass filters are presented.Eur. Office of Aerospace Res. and Dev. of the USAF,IEEE Region 8 Office,SRI on Radar Syst. "Kvant-Radiolokatsiya", Kyiv, Ukraine,Joint Stock Co. "TPOAZ", Donetsk, Ukraine,Scientific-Prod. Company "TERA", Kyiv, Ukrain
Modeling and simulation challenges in microwave engineering
Full text linkSevgi, Levent (Dogus Author)This special issue entitled ‘‘Modeling and Simulation Challenges in Microwave Engineering’’ contains invited/ selected articles from The 12th Mediterranean Microwave Symposium (MMS 2012, http://mms.dogus.edu.tr), which was held at Dogus_ University during September 2–5, 2012 at the same time together with The 6th URSI-Turkey National Assembly and Congress (URSI-Turkey 2012, http://ursi.dogus.edu.tr). Technical programs of MMS 2012 covered a vast array of electromagnetic and microwave topics, including microwave circuit design and applications, the latest breakthroughs in antenna design, wireless communications, exotic materials, biomedical applications, numerical methods, etc
From engineering electromagnetics towards electromagnetic engineering: issues, chalanges and applications - preface
Full text linkNowadays, electromagnetics (EM) is everywhere! Although the contents of the two basic EM lectures – Field Theory and Wave Theory – have stayed almost unchanged for the last couple of decades we have witnessed the transformation from engineering EM to EM engineering for some time. Therefore, addressing technical challenges posed by electrical, electronics, communication, and computer system complexities requires a broad range of innovative, multi-disciplinary analytical and computational skills that are not adequately covered in conventional EM engineering curricula. EM engineering community, therefore, must be prepared to adapt to frequent shifts in technological priorities and rapid scientific advances, followed by rapid advances in technologies. [...
Metamaterials: definitions, properties, applications and FDTD - based modeling and simulation (Invited paper)
No full textIn this article, we review definition, origin, terminology, fundamental properties, design concepts and procedures, basic applications, modeling, and numerical simulation of metamaterials. It is shown that metamaterial origin can be easily understood by placing metamaterials in the more general context of artificial electromagnetic materials and of the efforts performed by the scientific community working in complex materials to mimic and overcome the properties of natural materials. The basic properties of some classes of metamaterials as well as the related limitations are reviewed and discussed. A new application-oriented definition of metamaterials is given in terms of a functionalizing layer placed in between the traditional concepts of materials and devices. Metamaterial applications and the design steps of metamaterial-based and metamaterial-inspired components are also discussed, with particular emphasis on the numerical simulation of ideal metamaterials through available solvers. In this frame, finite-difference time-domain (FDTD) modeling and simulation of the electromagnetic properties of metamaterials are deeply discussed. The recently introduced virtual MTM-FDTD tool is used to simulate the interaction between the electromagnetic field and metamaterials and show some metamaterial effects, such as beam focusing, existence of negative refractive angle, and so forth, through various examples in different scenarios
Web - based virtual laboratories for antenna arrays, radiowave propagation and filter design
No full textThis 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 to prepare their own Web-based applications. Three Web-based virtual laboratories, AntenGUI, SSPEGUI, and FilterGUI, created using MWS, a re presented. The AntenGUI application illustrates the array factor of linear, rectangular, and circular arrays. The SSPEGUI application visualizes radiowave propagation over a non-smooth Earth's surface through a non-homogenous atmosphere. The FilterGUI tool designs lumped-element (LC) filters, and obtains the corresponding transmission-line and microstrip-line filters. These Web-based virtual tools can be accessed on the Internet.IEEE Antennas and Propagation Societ
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