Browsing by Keywords "Electromagnetic scattering"
Now showing items 120 of 43

Accurate solutions of scattering problems involving lowcontrast dielectric objects with surface integral equations
(Institution of Engineering and Technology, 2007)We present the stabilization of the surface integral equations for accurate solutions of scattering problems involving lowcontrast dielectric objects. Unlike volume formulations, conventional surface formulations fail to ... 
Analysis of an arbitraryprofile, cylindrical, impedance reflector surface illuminated by an Epolarized complex line source beam
(VSP BV, 2014)Electromagnetic scattering from a cylindrical reflector surface having an arbitrary conic section profile is studied. We assumed an electrically thin layer antenna illuminated by a complex line source in Epolarization ... 
Analysis of the ellipticprofile cylindrical reflector with a nonuniform resistivity using the complex source and dualseries approach: Hpolarization case
(Springer, 2013)An ellipticprofile reflector with varying resistivity is analyzed under the illumination by an Hpolarized beam generated by a complexsourcepoint (CSP) feed. The emphasis is done on the focusing ability that is potentially ... 
Approximate MLFMA as an efficient preconditioner
(IEEE, 2007)In this work, we propose a preconditioner that approximates the dense system operator. For this purpose, we develop an approximate multilevel fast multipole algorithm (AMLFMA), which performs a much faster matrixvector ... 
Characteristic basis function method for solving electromagnetic scattering problems over rough terrain profiles
(IEEE, 201031)A computationally efficient algorithm, which combines the characteristic basis function method (CBFM), the physical optics (PO) approach (when applicable) with the forward backward method (FBM), is applied for the investigation ... 
Computational analysis of complicated metamaterial structures using MLFMA and nested preconditioners
(IEEE, 200711)We consider accurate solution of scattering problems involving complicated metamaterial (MM) structures consisting of thin wires and splitring resonators. The scattering problems are formulated by the electricfield ... 
Computational study of scattering from healthy and diseased red blood cells
(Society of Photo Optical Instrumentation Engineers, 20100805)We present a comparative study of scattering from healthy red blood cells (RBCs) and diseased RBCs with deformed shapes. Scattering problems involving threedimensional RBCs are formulated accurately with the electric and ... 
An efficient and accurate technique for the incidentwave excitations in the FDTD method
(Institute of Electrical and Electronics Engineers, 199806)An efficient technique to improve the accuracy of the finitedifference timedomain (FDTD) solutions employing incidentwave excitations is developed. In the separatefield formulation of the FDTD method, any incident wave ... 
Efficient methods for electromagnetic characterization of 2D geometries in stratified media
(IEEE, 1998)Numerically efficient method of moments (MoM) algorithms are developed for and applied to 2D geometries in multilayer media. These are, namely, the spatialdomain MoM in conjunction with the closedform Green's functions, ... 
Efficient parallelization of the multilevel fast multipole algorithm for the solution of largescale scattering problems
(Institute of Electrical and Electronics Engineers, 200808)We present fast and accurate solutions of largescale scattering problems involving threedimensional closed conductors with arbitrary shapes using the multilevel fast multipole algorithm (MLFMA). With an efficient ... 
Electromagnetic scattering by several 2D single biological cell models
(IEEE, 201801)The electromagnetic 2D scattering from a single biological cell is analyzed by using Muller boundary integral equation (MBIE) method. The accuracy and smoothness of the solution are improved by applying Nystromtype ... 
Electromagnetic scattering of THz waves from a microsize graphenesandwiched thin dielectric strip
(IEEE, 201807)Twodimensional (2D) scattering of the Hpolarized plane wave by a composite flat material strip is investigated. It is made as graphenedielectricgraphene sandwichlike structure which is placed in the free space. Our ... 
Electromagnetic scattering solution of conducting strips in layered media using the fast multipole method
(Institute of Electrical and Electronics Engineers, 199608)The fast multipole method (FMM) is applied to the solution of the electromagnetic scattering problems in layered media for the first time. This is achieved by using closedform expressions for the spatialdomain Green's ... 
Fast and accurate solutions of largescale scattering problems with parallel multilevel fast multipole algorithm
(IEEE, 2007)Fast and accurate solution of largescale scattering problems obtained by integralequation formulations for conducting surfaces is considered in this paper. By employing a parallel implementation of the multilevel fast ... 
Focusing ability of a microsize graphenebased cylindrical reflector in the THz range illuminated by electromagnetic plane wave
(IEEE, 201607)The scattering of the Hpolarized plane wave by a twodimensional (2D) parabolic reflector made of graphene placed in the free space is simulated by using the Method of Analytical Regularization (MAR) technique. The total ... 
Improving the accuracy of the surface integral equations for lowcontrast dielectric scatterers
(IEEE, 2007)Solutions of scattering problems involving lowcontrast dielectric objects are considered by employing surface integral equations. A stabilization procedure based on extracting the nonradiating part of the induced currents ... 
Incomplete LU preconditioning with the multilevel fast multipole algorithm for electromagnetic scattering
(Society for Industrial and Applied Mathematics, 2007)Iterative solution of largescale scattering problems in computational electromagnetics with the multilevel fast multipole algorithm (MLFMA) requires strong preconditioners, especially for the electricfield integral ... 
Iterative solution of the normalequations form of the electricfield integral equation
(IEEE, 2007)In this paper, we show that transforming the original equations into normal equations improves the convergence of EFIE significantly. We present the solutions of EFIE by employing the leastsquares QR (LSQR) algorithm, ... 
Largescale solutions of electromagnetics problems using the multilevel fast multipole algorithm and physical optics
(Bilkent University, 201504)Integral equations provide fullwave (accurate) solutions of Helmholtztype electromagnetics problems. The multilevel fast multipole algorithm (MLFMA) discretizes the equations and solves them numerically with O(NLogN) ... 
The method of regularization and its application to some EM problems
(Springer, 2000)The regularization of the integral equations for the solution of electromagnetic problems is discussed. The technique includes a semianalytic inversion of the integral operator resulting in equation of the Fredholm second ...