Browsing by Keywords "Computational electromagnetics"
Now showing items 118 of 18

Accelerating the multilevel fast multipole algorithm with the sparseapproximateinverse (SAI) preconditioning
(Society for Industrial and Applied Mathematics, 2009)With the help of the multilevel fast multipole algorithm, integralequation methods can be used to solve reallife electromagnetics problems both accurately and efficiently. Increasing problem dimensions, on the other hand, ... 
Accuracy and efficiency considerations in the solution of extremely large electromagnetics problems
(2011)This study considers fast and accurate solutions of extremely large electromagnetics problems. Surface formulations of largescale objects lead to dense matrix equations involving millions of unknowns. Thanks to recent ... 
Analysis of doublenegative materials with surface integral equations and the multilevel fast multipole algorithm
(2011)We present a fast and accurate analysis of doublenegative materials (DNMs) with surface integral equations and the multilevel fast multipole algorithm (MLFMA). DNMs are commonly used as simplified models of metamaterials ... 
Fast and accurate analysis of optical metamaterials using surface integral equations and the parallel multilevel fast multipole algorithm
(2013)We present fast and accurate simulations of optical metamaterials using surface integral equations and the multilevel fast multipole algorithm (MLFMA). Problems are formulated with the electric and magnetic current ... 
Fast and accurate solutions of extremely large integralequation problems discretised with tens of millions of unknowns
(The Institution of Engineering and Technology, 2007)The solution of extremely large scattering problems that are formulated by integral equations and discretised with tens of millions of unknowns is reported. Accurate and efficient solutions are performed by employing a ... 
Fast direct (noniterative) solvers for integralequation formulations of scattering problems
(IEEE, Piscataway, NJ, United States, 1998)A family of direct (noniterative) solvers with reduced computational complexity is proposed for solving problems involving resonant or nearresonant structures. Based on the recursive interaction matrix algorithm, the ... 
Hierarchical parallelization of the multilevel fast multipole algorithm (MLFMA)
(IEEE, 2013)Due to its O(N log N) complexity, the multilevel fast multipole algorithm (MLFMA) is one of the most prized algorithms of computational electromagnetics and certain other disciplines. Various implementations of this algorithm ... 
Iterative nearfield preconditioner for the multilevel fast multipole algorithm
(Society for Industrial and Applied Mathematics, 20100706)For iterative solutions of large and difficult integralequation problems in computational electromagnetics using the multilevel fast multipole algorithm (MLFMA), preconditioners are usually built from the available sparse ... 
Microwave imaging of threedimensional conducting objects using the newton minimization approach
(2013)In this work, we present a framework to detect the shape of unknown perfect electric conducting objects by using inverse scattering and microwave imaging. The initialguess object, which evolves to achieve the target, is ... 
On the choice of basis functions to model surface electric current densities in computational electromagnetics
(WileyBlackwell Publishing, Inc., 199911)Basis functions that are used to model surface electric current densities in the electric field integral equations of computational electromagnetics are analyzed with respect to how well they model the charge distribution, ... 
A performanceenhanced planar Schottky diode for Terahertz applications: an electromagnetic modeling approach
(Cambridge University Press, 2017)In this paper, we present the electromagnetic modeling of a performanceenhanced planar Schottky diode for applications in terahertz (THz) frequencies. We provide a systematic simulation approach for analyzing our Schottky ... 
Reducing MLFMA memory with outofcore implementation and datastructure parallelization
(2013)We present two memoryreduction methods for the parallel multilevel fast multipole algorithm (MLFMA). The first method implements outofcore techniques and the second method parallelizes the preprocessing data structures. ... 
Rigorous solutions of largescale dielectric problems with the parallel multilevel fast multipole algorithm
(2011)We present fast and accurate solutions of largescale electromagnetics problems involving threedimensional homogeneous dielectric objects. Problems are formulated rigorously with the electric and magnetic current ... 
Schur complement preconditioners for surface integralequation formulations of dielectric problems solved with the multilevel fast multipole algorithm
(Society for Industrial and Applied Mathematics, 20111004)Surface integralequation methods accelerated with the multilevel fast multipole algorithm (MLFMA) provide a suitable mechanism for electromagnetic analysis of reallife dielectric problems. Unlike the perfectelectricconductor ... 
Simulationbased engineering
(Springer, 2017)Engineers, mathematicians, and scientists were always interested in numerical solutions of realworld problems. The ultimate objective within nearly all engineering projects is to reach a functional design without violating ... 
Solution of lowfrequency electromagnetics problems using hierarchical matrices
(2013)Fast and accurate solutions of lowfrequency electromagnetics problems are obtained with an iterative solver based on hierarchical matrices. Iterative solvers require matrixvector multiplications (MVMs). The results show ... 
Test of accuracy of the generalized boundary conditions in the scattering by thin dielectric strips
(Institute of Electrical and Electronics Engineers Inc., 2014)The twodimensional (2D) scattering of the E and Hpolarized plane electromagnetic waves by a freestanding thinner than the wavelength dielectric strip is considered numerically. Two methods are compared: singular integral ... 
Windowed equivalence principle for open surfaces
(2013)We introduce a modified current expansion scheme over open surfaces based on the equivalence theorem, which employs closed surfaces, in principle. Weighting the expansion coefficients with a suitable window function ...