Browsing by Author "Ertürk, Vakur B."
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Analysis of cylindrically conformal antennas using closedform Green's function representations
Kalfa, Mert; Karan, S.; Ertürk, Vakur B. (IEEE, 201504)Probefed microstrip patch antennas and slotted sectoral waveguide array antennas embedded in cylindrically stratified media are analyzed with a hybrid Method of Moments/Green's function technique, where closedform Green's ... 
Analysis of slotted sectoral waveguide array antennas with multilayer radomes and nonzero metal thickness
Kalfa, Mert; Ertürk, Vakur B. (IEEE, 201507)Slotted waveguide array antennas offer low crosspolarization and high power handling capacity, and they are lowprofile which enables them to be used in conformal and structurallyintegrated antenna solutions. Hence, they ... 
Application of fast methods to large scale rough surface scattering and propagation problems
Altıntaş, Ayhan; Ertürk, Vakur B.; Tunç, Celal; Topçu, Satılmış (2006) 
Broadband analysis of multiscale electromagnetic problems: Novel incompleteleaf MLFMA for potential integral equations
Khalichi, Bahram; Ergül, Ö.; Takrimi, Manouchehr; Ertürk, Vakur B. (IEEE, 20210624)Recently introduced incomplete tree structures for the magneticfield integral equation are modified and used in conjunction with the mixedform multilevel fast multipole algorithm (MLFMA) to employ a novel broadband ... 
Broadband multilevel fast multipole algorithm for largescale problems with nonuniform discretizations
Ergül, Ö.; Karaosmanoğlu, B.; Takrimi, Manouchehr; Ertürk, Vakur B. (IEEE, 2016)We present a broadband implementation of the multilevel fast multipole algorithm (MLFMA) for fast and accurate solutions of multiscale problems involving highly nonuniform discretizations. Incomplete tree structures, which ... 
A broadband multilevel fast multipole algorithm with incompleteleaf tree structures for multiscale electromagnetic problems
Takrimi, Manouchehr; Ergül, Ö.; Ertürk, Vakur B. (IEEE, 2016)An efficient, broadband, and accurate multilevel fast multipole algorithm (MLFMA) is proposed to solve a wide range of multiscale electromagnetic problems with orders of magnitude differences in the mesh sizes. Given a ... 
Broadband solutions of potential integral equations with NSPWMLFMA
Khalichi, Bahram; Ergül, Ö.; Ertürk, Vakur B. (IEEE, 201906)In this communication, a mixedform multilevel fast multipole algorithm (MLFMA) is combined with the recently introduced potential integral equations (PIEs), also called as the Aφ system, to obtain an efficient and accurate ... 
Computation of surface fields excited on arbitrary smooth convex surfaces with an impedance boundary condition
Alişan, Burak; Ertürk, Vakur B. (2012) 
Derivation of Green's function representations for the analysis of sectoral waveguides embedded in cylindrically stratified media
Kalfa, Mert; Ertürk, Vakur B. (IEEE, 2013)The design and analysis of dielectriccovered slotted waveguide arrays are of great interest in many military and civil applications, because of their lowprofile, high efficiency and high power handling capabilities. ... 
Efficient analysis of large finite arrays via mom formulation with dft based acceleration algorithms
Çivi, Ö. A.; Ertürk, Vakur B.; Chou, H.T. (2003)A DFT based acceleration algorithm is combined with iterative methods to accelerate the computation of Method of Moments (MoM) analysis of electromagnetic radiation/scattering from large, finite freestanding and printed ... 
An electromagnetic sensing system incorporating multiple probes and single antenna for wireless structural health monitoring
Özbey, Burak; Altıntaş, Ayhan; Demir, Hilmi Volkan; Ertürk, Vakur B.; Kurç, Ö. (IEEE, 2017)In this study, a wireless and passive displacement/strain sensing system is proposed for structural health monitoring (SHM). The wireless and passive interrogation of the sensing unit [a variant of a nested splitring ... 
Error analysis of MLFMA with closedform expressions
Kalfa, Mert; Ertürk, Vakur B.; Ergül, Özgür (IEEE, 20210406)The current stateoftheart error control of the multilevel fast multipole algorithm (MLFMA) is valid for any given error threshold at any frequency, but it requires a multipleprecision arithmetic framework to be ... 
Error control in MLFMA with multipleprecision arithmetic
Kalfa, Mert; Ergül, Ö.; Ertürk, Vakur B. (Institution of Engineering and Technology, 201804)We present a new error control method that provides the truncation numbers as well as the required digits of machine precision for the translation operator of the multilevel fast multipole algorithm (MLFMA). The proposed ... 
Extension of forward backward method with DFT based acceleration algorithm for the efficient analysis of large periodic arrays with arbitrary boundaries
Çivi, Ö. A.; Chou, H. T.; Ertürk, Vakur B. (IEEE, 2003)An extension of ForwardBackward (FB) with Discrete Fourier Transform (DFT) based acceleration approach is presented. This is given to provide a relatively efficient analysis of EM radiation/scattering from an electrically ... 
Fast acceleration algorithm based on DFT expansion for the iterative MoM analysis of electromagnetic radiation/scattering from twodimensional large phased arrays
Ertürk, Vakur B.; Chou, H. T. (IEEE, 2002)An acceleration algorithm based on Discrete Fourier Transform (DFT) is developed to reduce the computational complexity and memory storages of iterative methods of moment (IMoM) solution to O(Ntot), where Ntot is the total ... 
Fast integral equation techniques for propagation problems
Babaoğlu, Barış; Tunç, Celal A.; Altıntaş, Ayhan; Ertürk, Vakur B. (IEEE, 200409)In this paper, the Method of Moments (MoM) solution is achieved for scattering problems by using the stationary Spectrally Accelerated ForwardBackward method (FBSA) and the nonstationary Spectrally Accelerated BiConjugate ... 
Geniş ölçekli pürüzlü yüzeylerden saçınım ve yayınım problemleri için hızlı yöntemler ve uygulamaları
Ertürk, Vakur B.; Tunç, Celal; Topçu, Satılmış; Altıntaş, Ayhan (2006) 
Integral equation based method for the fast analysis of irregularly contoured large finite phased arrays
Ertürk, Vakur B.; Çivi, Ö. A. (Institution of Engineering and Technology, 2007)A fast and accurate integral equation based hybrid method that can investigate electrically large, arbitrarily contoured finite planar arrays of printed elements is developed. The method is a hybridization of the Galerkin ... 
Investigation of metamaterial coated conducting cylinders for achieving transparency and maximizing radar cross section
Ircı, Erdinç; Ertürk, Vakur B. (IEEE, 2007)Recently, reducing the radar cross sections (RCS) of various structures to achieve transparency and obtaining resonant structures aimed at increasing the electromagnetic intensities, stored or radiated power levels have ... 
Investigation of planar and conformal printed arrays for MIMO performance analysis
Tunç, Celal Alp; Ircı, Erdinç; Bakır, Onur; Aktaş, Defne; Ertürk, Vakur B.; Altıntaş, Ayhan (IEEE, 2006)MIMO channel capacity of printed arrays with dipole elements is analyzed. A MIMO channel model based on electric fields is used. The effects of mutual interactions among the array elements through space and surface waves ...