Browsing by Keywords "Electromagnetic wave scattering"
Now showing items 21-40 of 43
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FDTD simulations of multiple GPR systems
(IEEE, 2003-06)A multiple-GPR detection system was simulated. The main advantage of such a system was that it saves time by detecting both the transverse and the longitudinal positions of the target by a B-scan measurement, whereas the ... -
Hierarchical parallelization of the multilevel fast multipole algorithm for the efficient solution of large-scale scattering problems
(IEEE, 2008-07)We present the details of a hierarchical parallelization strategy, which provides higher efficiency than the previous parallelization approaches for MLFMA. We demonstrate the effectiveness of our algorithm on sphere problems ... -
A high-frequency based asymptotic solution for surface fields on a source-excited sphere with an impedance boundary condition
(Wiley-Blackwell Publishing, 2010-10-05)A high-frequency asymptotic solution based on the Uniform Geometrical Theory of Diffraction (UTD) is proposed for the surface fields excited by a magnetic source located on the surface of a sphere with an impedance boundary ... -
Hybrid CFIE-EFIE solution of composite geometries with coexisting open and closed surfaces
(IEEE, 2005)The combined-field integral equation (CFIE) is employed to formulate the electromagnetic scattering and radiation problems of composite geometries with coexisting open and closed conducting surfaces. Conventional formulations ... -
Hybridizing physical optics with MLFMA for efficient scattering computations of three-dimensional complex targets
(IEEE, 2009-07)The multilevel fast multipole algorithm (MLFMA) provides accurate and efficient solutions of electromagnetic scattering problems involving large and complicated structures. On the other hand, whenever applicable, accelerations ... -
Improving the accuracy of the MFIE with the choice of basis functions
(IEEE, 2004-06)The accuracy of the magnetic-field integral equation (MFIE) for the Method of Moments (MOM) and fast-multiple-method (FMM) solutions of the electromagnetic scattering problems modeled by abitrary planar triangulations is ... -
Investigation of the inaccuracy of the MFIE discretized with the RWG basis functions
(IEEE, 2004-06)The inaccuracy of the magnetic-field integral equation (MFIE) discretized with the Rao-Wilton-Glisson (RWG) basis functions is discussed. The electric-field integral equation (EFIE) gives accurate results with the usage ... -
Metamaterial based cloaking with sparse distribution of spiral resonators
(SPIE, 2010)We investigate the application of a metamaterial that is formed by the sparse distribution of spiral resonators as an optical transformation medium is in order to achieve electromagnetic cloaking. The well-known Clausius-Mossotti ... -
The method of analytical regularization in the electromagnetic wave scattering by thin disks
(Institution of Engineering and Technology, 2007)We consider the problem of diffraction of an arbitrary electromagnetic wave by a thin disk made from different materials and located in free space. Here we imply a zero- thickness perfectly electrically conducting (PEC) ... -
MLFMA memory reduction techniques for solving large-scale problems
(IEEE, 2014)We present two memory reduction methods for the parallel multilevel fast multipole algorithm. One of these methods uses data structures out of core, and the other parallelizes the data structures related to input geometry. ... -
On the accuracy of MFIE and CFIE in the solution of large electromagnetic scattering problems
(ESA Publications, 2006)We present the linear-linear (LL) basis functions to improve the accuracy of the magnetic-field integral equation (MFIE) and the combined-field integral equation (CFIE) for three-dimensional electromagnetic scattering ... -
On the frequency-band selection for ground-penetrating radars operating over lossy and heterogeneous grounds
(IEEE, 2001-07)The frequency-band selection for ground penetrating radars operating over lossy and heterogenous grounds was discussed. The simulations were carried out using perfectly matched layer (PML) absorbing boundary conditions ... -
Parallel-MLFMA solution of CFIE discretized with tens of millions of unknowns
(Institution of Engineering and Technology, 2007)We consider the solution of large scattering problems in electromagnetics involving three-dimensional arbitrary geometries with closed surfaces. The problems are formulated accurately with the combined-field integral ... -
Plasmon and grid resonances in the electromagnetic scattering by finite grids of silver nanowires
(IEEE, 2010)The problem of the H-polarized wave scattering by finite chains of circular nanowires is considered. A two-dimensional diffraction problem with rigorous boundary conditions is solved by partial separations of variables ... -
Radar cross-section study of cylindrical cavity-backed apertures with outer or inner material coating: the case of E-polarization
(IEEE, 1993)A dual-series-based solution is obtained for the scattering of an E-polarized plane wave from a cavity-backed aperture which is formed by a slitted infinite circular cylinder coated with absorbing material. The material ... -
RCS study of cylindrical cavity-backed apertures with outer or inner material coating: the case of e-polarization
(IEEE, 1993)Cavity-backed apertures (CBA) are encountered as parts of any airborne or spaceborne radar targets. Most familiar of them are, probably, air inlets and engine tubes, known to contribute a great deal to radar cross section ... -
Simulation of TRT-configured ground-penetrating radars over heterogeneous grounds
(IEEE, 2001)The simulation of transmitter-reciever-transmitter (TRT) configured ground-penetrating radars over heterogeneous grounds was discussed. The finite-difference time-domain (FDTD) methods along with the perfectly-matched layer ... -
The solution of large EFIE problems via preconditioned multilevel fast multipole algorithm
(Institution of Engineering and Technology, 2007)We propose an effective preconditioning scheme for the iterative solution of the systems formulated by the electric- field integral equation (EFIE). EFIE is notorious for producing difficult-to-solve systems. Especially, ... -
Solutions of large integral-equation problems with preconditioned MLFMA
(IEEE, 2007)We report the solution of the largest integral-equation problems in computational electromagnetics. We consider matrix equations obtained from the discretization of the integral-equation formulations that are solved ... -
Subsurface-scattering calculations via the 3D FDTD method employing PML ABC for layered media
(IEEE, 1997)A three-dimensional finite-difference time-domain method that employs pure scattered-field formulation and perfectly matched layers (PML) as the absorbing boundary condition is developed for solving subsurface-scattering. ...
