Browsing by Keywords "Electromagnetism"
Now showing items 120 of 33

Accuracy and efficiency considerations in the solution of extremely large electromagnetics problems
(IEEE, 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
(IEEE, 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 ... 
Analysis of photoniccrystal problems with MLFMA and approximate Schur preconditioners
(IEEE, 200907)We consider fast and accurate solutions of electromagnetics problems involving threedimensional photonic crystals (PhCs). Problems are formulated with the combined tangential formulation (CTF) and the electric and magnetic ... 
Calculation of radomeenclosed aperture antenna in 3D
(IEEE, 201009)The exact mathematical model of an aperture antenna and the image theory are used to develop exact and PO integral representations of the fields radiated by radomeenclosed aperture antenna. The desired problem is reduced ... 
Characteristic equations for the lasing Modes of infinite periodic chain of quantum wires
(IEEE, 200806)In this paper, we study the lasing modes of a periodic open optical resonator. The resonator is an infinite chain of active circular cylindrical quantum wires standing in tree space. Characteristic equations for the ... 
Effect of disorder on magnetic resonance band gap of splitring resonator structures
(Optical Society of American (OSA), 2004)We investigated the influence of periodicity, misalignment, and disorder on the magnetic resonance gap of splitring resonators (SRRs) which are essential components of left handedmetamaterials (LHMs). The resonance of a ... 
Effect of the offfocus shift of the feed on the radiation characteristics of a 2D parabolic reflector antenna
(IEEE, 2010)The parabolic reflector antennas are widely used in the telecommunication systems and generally have large aperture sizes like 50λ to 80λ and larger. Their reliable fullwave analysis with the conventional Method of Moments ... 
Efficient analysis of large finite arrays via mom formulation with dft based acceleration algorithms
(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 efficient parallel implementation of the multilevel fast multipole algorithm for rigorous solutions of largescale scattering problems
(IEEE, 2010)We present the solution of largescale scattering problems discretized with hundreds of millions of unknowns. The multilevel fast multipole algorithm (MLFMA) is parallelized using the hierarchical partitioning strategy on ... 
Efficient solution of the combinedfield integral equation with the parallel multilevel fast multipole algorithm
(IEEE, 200708)We present fast and accurate solutions of largescale scattering problems formulated with the combinedfield integral equation. Using the multilevel fast multipole algorithm (MLFMA) parallelized on a cluster of computers, ... 
Electromagnetic modeling of splitring resonators
(IEEE, 2007)In this paper, we report our efforts to model splitring resonators (SRRs) and their large arrays accurately and efficiently in a sophisticated simulation environment based on recent advances in the computational electromagnetics. ... 
Electromagnetically induced lefthandedness in a dense gas of threelevel atoms
(The American Physical Society, 2004)Ways in which a threelevel system can be used to change the frequencydependent magnetic permeability of an atomic gas were discussed. The resulting macroscopic electrodynamics was also discussed. The two levels were ... 
EU NoE metamorphose: Metamaterials research activities
(SPIE, 2005)We will present the activities of METAMORPHOSE a network of excellence (NoE) formed under EUFP6 on the area of metamaterials. The main scientific objective of the partners of this consortium is to develop new types of ... 
Experimental demonstration of subwavelength imaging by left handed metamaterials
(SPIE, 2007)We review the studies conducted in our group concerning electromagnetic properties of metamaterials and photonic crystals with negative effective index of refraction. In particular, we demonstate the true left handed ... 
Experimental observation of true lefthanded transmission, negative refraction and negative phase velocity in composite metamaterials
(IEEE, 2005)We report a true lefthanded (LH) behavior in a composite metamaterial consisting of periodically arranged split ring resonator (SRR) and wire structures. The magnetic resonance of the SRR structure is demonstrated by ... 
Extension of forwardbackward method with DFTbased acceleration algorithm for the efficient analysis of large periodic arrays with arbitrary boundaries
(John Wiley & Sons, 2005)An extension of the discrete Fourier transform (DFT)based forwardbackward algorithm is developed using the virtualelement approach to provide a fast and accurate analysis of electromagnetic radiation/scattering from ... 
Extracting power from subwavelength apertures by using electrically small resonators: Phenomenology, modeling, and applications
(IEEE, 2012)In this contribution, we review our recent work on the extraction of the electromagnetic power from electrically small apertures by using metamaterialinspired resonators. First, we present an antenna interpretation of the ... 
Fast and accurate analysis of complicated metamaterial structures using a lowfrequency multilevel fast multipole algorithm
(200909)We present efficient solutions of electromagnetics problems involving realistic metamaterial structures using a lowfrequency multilevel fast multipole algorithm (LFMLFMA). Ordinary implementations of MLFMA based on the ... 
Fast and accurate analysis of optical metamaterials using surface integral equations and the parallel multilevel fast multipole algorithm
(IEEE, 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 scattering problems involving dielectric objects with moderate and low contrasts
(IEEE, 200708)We consider the solution of electromagnetic scattering problems involving relatively large dielectric objects with moderate and low contrasts. Threedimensional objects are discretized with RaoWiltonGlisson functions and ...