In Holliday et al. (1995, 1996), the iterative forward-backward (FB) method has been proposed to solve magnetic field integral equation (MFIE) for smooth one-dimensional (1-D) rough surfaces. This proved be very efficient, converging in a small number of iterations. Nevertheless, this solution becomes unstable when some obstacle, like ship or large breaking wave, is included original problem. paper, we propose new method: generalized (GFB) such kinds complex problems. The approach formulated...

An efficient hybrid MPI/OpenMP parallel implementation of an innovative approach that combines the Fast Fourier Transform (FFT) and Multilevel Multipole Algorithm (MLFMA) has been successfully used to solve electromagnetic problem involving 620 millions unknowns.The MLFMA-FFT method can deal with extremely large problems due its high scalability reduced computational complexity.

We present a surface integral equation (SIE) to model the electromagnetic behavior of metallic objects at optical frequencies. The electric and magnetic current combined field considering both tangential normal equations is applied. SIE solved by using method-of-moments (MoM) formulation. SIE-MoM approach applied only on material boundary surfaces interfaces, avoiding cumbersome volumetric discretization surrounding space required in differential-equation formulations. Some canonical...

The performance of most widespread surface integral equation (SIE) formulations with the method moments (MoM) are studied in context plasmonic materials.Although not yet optics, SIE-MoM approaches bring important advantages for rigorous analysis penetrable bodies.Criteria such as accuracy near and far field calculations, iterative convergence reliability addressed to assess suitability these plasmonics.

Optical connects will become a key point in the next generation of integrated circuits, namely upcoming nanoscale optical chips. In this context, nano-optical wireless links using nanoantennas have been presented as promising alternative to regular plasmonic waveguide links, whose main limitation is range propagation due metal absorption losses. paper we present complete design high-capability nanolink matched directive nanoantennas. It be shown how use clearly enhances capability link,...

An efficient parallel implementation of the multilevel fast multipole algorithm-fast Fourier transform (MLFMA-FFT) has been successfully used to solve an electromagnetic problem involving one billion unknowns, which indeed becomes largest solved with surface integral-equation approach up now. In this paper, we present a deep review challenging execution, focusing on details step by step, aim describing different stages algorithm and analyzing its overall performance.

An efficient parallel implementation of the Fast Multipole Method (FMM) combined with fast Fourier transform (FFT) is presented in this paper. The good scaling properties FMM-FFT, a smart parallelization strategy, has been shown to be very effective when using large supercomputers. A challenging problem more than 150 million unknowns solved, demonstrating that proposed FMM-FFT constitutes real alternative frequently used multilevel approaches, such as Multilevel FMM (MLFMA). Even...

A surface integral equation (SIE) formulation is applied to the analysis of electromagnetic problems involving three-dimensional (3D) piecewise homogenized left-handed metamaterials (LHM). The resulting equations are discretized by well-known method moments (MoM) and solved via an iterative process. unknowns defined only on interfaces between different media, avoiding discretization volumes surrounding space, which entails a drastic reduction in number arising numerical equations. Besides,...

In this work, a system subject to different deterioration processes is analysed. The arrival of the degradation modelled using shot-noise Cox process. grow according an homogeneous gamma fails when process exceeds failure threshold. combined initiation and growth reliability obtained. Heterogeneities are also integrated in model assuming that inverse scale parameter follows uniform distribution. A maintenance strategy implemented state checked inspection times. If working at time, preventive...

Abstract|It is a proven fact that The Fast Fourier Transform(FFT) extension of the conventional Multipole Method (FMM)reduces matrix vector product (MVP) complexity and preservesthe propensity for parallel scaling single level FMM. In thispaper, an e–cient strategy nested variation FMM-FFT algorithm reduces memory requirements presented.The solution provided by this implementation challengingproblem with more than 0.5 billion unknowns has constituted worldrecord in computational...

In this paper, we present a judicious combination of two renowned surface integral equation (SIE)-based techniques, namely, the multilevel fast multipole algorithm (MLFMA) and method moments (MoM), which synergize into hybrid that allows to address analysis large densely packed particle assemblies in an efficient accurate way. This hybridization takes advantage repetition pattern inherent these kinds structures. Basically, repeated self-coupling problems are squarely solved throughout...

We present a novel discontinuous Galerkin (DG) surface integral equation approach, based on the electric and magnetic current combined field equations (JMCFIE), for electromagnetic analysis of arbitrarily shaped piecewise homogeneous objects. In proposed scheme, nonoverlapping boundary surfaces interfaces between materials can be handled independently, without any continuity requirement through multimaterial junctions tear lines in contact. The use nonconformal meshes provides improved...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The authors present a new matrix compression algorithm to improve the efficiency of <emphasis emphasistype="boldital">fast multipole method</emphasis> (FMM). method is based on application emphasistype="boldital">singular value decomposition</emphasis> (SVD) plane wave FMM emphasistype="boldital">aggregation</emphasis> matrices. These matrices are low-ranked, which exploited provide alternative...

Most of the surface integral equation (SIE) formulations for composite conductor and/or penetrable objects suffer from balancing problems mainly because very different scales equivalent electric and magnetic currents.Consequently, impedance matrix usually has high-or ill-condition number due to imbalance between blocks.Using an efficient left right preconditioner elements are balanced.The proposed approach improves balance without modifying underlying SIE formulation, which can be selected...

An electric field integral equation (EFIE) discontinuous Galerkin (DG) formulation for the electromagnetic (EM) radiation analysis of realistic antennas is presented. Radiation problems are known to be computationally challenging, involving complex multiscale geometries often made up a collection closed and open surfaces. This complexity points convenience separately building meshing parts with different characteristics, either physical or geometric. piecewise modeling approach also...

In an Energy Harvesting system (EHS) the gamma process is used to model electromagnetic energy received from radiofrequency (RF) radiation. The stochastic characterization of harvested as a continuous‐time process, namely, obtained Nakagami‐m fading model, which describes signal reception in large amount types channels. Using some performance measures EHS are obtained. Also, transmission policy subject different conditions considered.

A new technique for synthesising array antennas in the presence of arbitrary obstacles near field region is presented. This allows a prescribed far pattern to be synthesised, while trying avoid coupling with through constraint minimising radiated power over obstacle surface. Some results have been obtained showing that are finally isolated from antenna radiation.

The synthesis of array antennas mounted on ships, or any other vehicular platform, is addressed here. Both the mutual coupling between elements, and their interaction with mounting are considered introduced into procedure. This done by using a three-dimensional formulation method moments, which models currents induced platform antennas, combined an optimization Some results presented, illustrating capability proposed method.

A linear-phase term is incorporated into the triangular-type Rao–Wilton–Glisson (RWG) vector basis functions in method of moments (MoM) formulation. The objective consists including dominant phase variation current density within basis-functions formulation, thus allowing an efficient representation induced on large bodies using fewer unknowns. Assuming a good estimation variation, new MoM formulation with linearly-phased RWG shown to greatly relieve storage and solution time conventional...

The estimators of directions arrival narrow-band signals using array antennas could be erroneous if we do not model adequately the behaviour global antenna system (for example, incorrect modeling mutual coupling or with platform). In this paper obtain an expression for evaluating bias Maximum Likelihood incorrectly antenna. results indicate that consider onboard as ideal (without electromagnetic effects) performance a direction arrivals (DOA) estimation may degradated.

The plasmonic behavior of nanostructured materials has ignited intense research for the fundamental physics structures and their cutting-edge applications concerning fields nanoscience biosensing.The optical response metals is generally well-described by classical Maxwell's Equations (ME).Thus, understanding plasmons design nanostructures can therefore directly benefit from lastest advances achieved in classic areas such as computational electromagnetics.In this context, paper devoted to...

A method to carry out the pattern synthesis of arbitrary array antennas is presented. This uses simulated annealing technique calculate power interferences described in Olen–Compton method. Its application a linear 16 unequally spaced nonidentical elements and circular arc 25 axial dipoles shown order illustrate its efficiency accuracy. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 20: 48–50, 1999.