Topic
Computational electromagnetics
About: Computational electromagnetics is a research topic. Over the lifetime, 6412 publications have been published within this topic receiving 113727 citations. The topic is also known as: Electromagnetic field analysis.
Papers published on a yearly basis
Papers
More filters
20 Jun 2004
TL;DR: The paper presents an efficient finite element based domain decomposition method (DDM) for the analysis of large electromagnetic problems with a finite number of different building blocks and is general enough to analyze arbitrary geometries.
Abstract: The paper presents an efficient finite element based domain decomposition method (DDM) (Benamou, J-D and Despre/spl grave/s, B., J Comput. Phys., vol.136, p.68-82. 1997; Stupfel, B. and Mognot, M., IEEE Trans. Antennas Propagat., vol.48, p.653-60, 2000) for the analysis of large electromagnetic problems with a finite number of different building blocks. Such problems arise in important engineering applications such as antenna arrays, frequency selective surfaces, photonic crystals and metamaterials. The method is general enough to analyze arbitrary geometries. The proposed method is based on three key ingredients: (a) the optimized Robin transmission condition across interfaces; (b) the new mortar method for nonconforming triangulations; (c) a fast dual-primal finite element tearing and interconnecting (DP-FETI) algorithm similar to that of Wolfe, C.T. et al. (see IEEE Trans. Antennas Propagat., vol.48, no.2, p.278-84, 2000).
25 citations
TL;DR: In this article, a scale changing approach is proposed for analyzing the electromagnetic scattering from discrete self-similar (e.g., log-periodic or pre-fractal) planar structures.
Abstract: A scale changing approach is proposed for analyzing the electromagnetic scattering from discrete self-similar (e.g., log-periodic or pre-fractal) planar structures. Such structures present metallic patterns at multiple scale levels and are viewed here as the superposition of multiple domains enclosed with appropriate boundary conditions. In each domain higher-order modes provide the accurate local description of the electromagnetic fields while lower-order modes are used to model the electromagnetic coupling between the various domains at large scales. The scale changing technique is applied here to the electromagnetic modeling of multifrequency selective surfaces and discrete self-similar (pre-fractal) scatterers. Experimental data are given for validation purpose. It is seen that the proposed technique is much better than the method of moments in time costing
25 citations
TL;DR: In this paper, a survey of compatibility relations in the finite element formulation of the electromagnetic field problem is given, and the divergence condition on the fluxes is shown to follow directly from the field equations but not necessarily from their discretized counterparts.
Abstract: When computing an electromagnetic field using the finite element method it is possible that, although Maxwell's equations are discretized accurately, highly inaccurate computational results are obtained. In those cases it can easily be shown that (some of) the electromagnetic compatibility relations (field properties that follow from Maxwell's equations) are not satisfied. The divergence condition on the fluxes, for instance, follows directly from the field equations but not necessarily from their discretized counterparts. This necessitates inclusion of the compatibility relations in the finite-element formulation of the field problem. A survey is given of all electromagnetic compatibility relations. >
25 citations
TL;DR: In this paper, a new method is presented that rapidly evaluates the many Green's tensor integrals encountered in three-dimensional electromagnetic modeling using an integral equation, where efficient and accurate computation of Hankel transforms are obtained by related and lagged convolutions.
Abstract: A new method is presented that rapidly evaluates the many Green’s tensor integrals encountered in three‐dimensional electromagnetic modeling using an integral equation. Application of a fast Hankel transform (FHT) algorithm (Anderson, 1982) is the basis for the new solution, where efficient and accurate computation of Hankel transforms are obtained by related and lagged convolutions (linear digital filtering). The FHT algorithm is briefly reviewed and compared to earlier convolution algorithms written by the author. The homogeneous and layered half‐space cases for the Green’s tensor integrals are presented in a form so that the FHT can be easily applied in practice. Computer timing runs comparing the FHT to conventional direct convolution methods are discussed, where the FHT’s performance was about 6 times faster for a homogeneous half‐space, and about 108 times faster for a five‐layer half‐space. Subsequent interpolation after the FHT is called is required to compute specific values of the tensor integra...
25 citations
01 Sep 2003
TL;DR: In this article, an open loop state space model was developed in view of the simultaneous control of different harmonic components of the magnetic field, integrating a lumped parameter electromagnetic model of the saddle coil system and a linear model of plasma magneto-hydro-dynamic (MHD) evolution.
Abstract: The new RFX load assembly is characterized by a thin copper shell with a 50 ms time constant, for the vertical field penetration, and 192 active saddle coils all around the torus. The active control of resistive wall modes (RWM's) is considered a basic issue to extend the pulse duration to its nominal value. An open loop state space model was developed in view of the simultaneous control of different harmonic components of the magnetic field. It integrates a lumped parameter electromagnetic model of the saddle coil system and a linear model of the plasma magneto-hydro-dynamic (MHD) evolution. Reduction techniques have already been tested in order to obtain a model suitable for the design of the control system of the plasma modes.
25 citations