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.

Electromagnetic modeling for design and loss estimation of resonant integrated spiral planar power passives (ISP/sup 3/)

Abstract: Over the past few years, the electromagnetic integration of multiple passive components into a single integrated planar power passive module has been shown viable, not only for resonant structures, but recently also for nonresonant applications. In this paper, the development of an electromagnetic model for a resonant integrated spiral planar power passive (ISP/sup 3/) structure is presented. For the design of the required passive component values to be integrated, a comprehensive electromagnetic model based on energy storage is presented. The overall structure losses including winding, core and dielectric losses are also estimated through the development of a partly one-dimensional electromagnetic field approximation. Finally, these electromagnetic models for design and loss estimation are compared to experimental results for three different prototypes of a particular design. The results show agreement to well within 10% of component and loss values in almost all cases.

Modal basis method in radiation problems

Abstract: Abslrofl - To solve radiation problems in time domain directly the modal representation of transient electromagnetic fields is considered. Using evolutionary approach the initial nonstationary three-dimensional electrodynamic problem is transformed into the problem for one-dimensional evolutionary equations. The modd basis for electromagnetic fields with arbitrary time dependence in spherical coordinate system is constructed. After elimination of the radial components of electrical and magnetic field from Maxwell equation system the four-dimensional diflerential operators are formed. It is proved that the operators are self- adjoint ones. The eigen-functions of the operators form the basis. The completeness of the basis is proved by means of Weyl Theorem about orthogonal splitting of Hilbert space. The expansion coeliicients of transient electromagnetic iield are found from the set of evolutionary equations.

Assessing the Performance of Leja and Clenshaw-Curtis Collocation for Computational Electromagnetics with Random Input Data

Abstract: We consider the problem of quantifying uncertainty regarding the output of an electromagnetic field problem in the presence of a large number of uncertain input parameters. In order to reduce the growth in complexity with the number of dimensions, we employ a dimension-adaptive stochastic collocation method based on nested univariate nodes. We examine the accuracy and performance of collocation schemes based on Clenshaw-Curtis and Leja rules, for the cases of uniform and bounded, non-uniform random inputs, respectively. Based on numerical experiments with an academic electromagnetic field model, we compare the two rules in both the univariate and multivariate case and for both quadrature and interpolation purposes. Results for a real-world electromagnetic field application featuring high-dimensional input uncertainty are also presented.

Electromagnetic modeling of finite length wires buried in a lossy half-space

Abstract: The horizontal buried wire of a finite length is analyzed by using the scattering theory. The current distribution along the wire due to an external electromagnetic interference (EMI) source is governed by the half-space Pocklington integral equation. The effect of the lower half-space is taken into account via the transmission coefficient (TC) appearing within the integral equation kernel. The principal advantage of the TC approach vs rigorous Sommerfeld integral approach is the formulation simplicity and reduced computational cost. The variational boundary element procedure is used for solving the Pocklington integral equation and the current induced along the buried wire due to the transmitted plane wave or current source excitation is obtained.