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.
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TL;DR: In this paper, a numerical method is presented by which the transient electromagnetic response of a two-dimensional (2D) conductor, embedded in a conductive host rock and excited by a rectangular current loop, can be modeled.
Abstract: A numerical method is presented by which the transient electromagnetic response of a two‐dimensional (2-D) conductor, embedded in a conductive host rock and excited by a rectangular current loop, can be modeled. This 2.5-D modeling problem has been formulated in the time domain in terms of a vector diffusion equation for the scattered magnetic induction, which is Fourier transformed into the spatial wavenumber domain in the strike direction of the conductor. To confine the region of solution of the diffusion equation to the conductive earth, boundary values for the components of the magnetic induction on the ground surface have been calculated by means of an integral transform of the vertical component of the magnetic induction at the air‐earth interface. The system of parabolic differential equations for the three magnetic components has been integrated for 9 to 15 discrete spatial wavenumbers ranging from 10-7 to 4×10-2m-1 using an implicit homogeneous finite‐difference scheme. The discretization of the...
22 citations
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TL;DR: In this article, the authors synthesize compact lumped (RLC) models from the results of an electromagnetic (EM) analysis of planar circuits using S-parameter data at two or more frequencies.
Abstract: Synthesis of compact lumped (RLC) models from the results of an electromagnetic (EM) analysis of planar circuits is described. The technique requires precise EM analysis S-parameter data at two or more frequencies. Data at up to five frequencies allows synthesis of more complicated models. For each port-to-port (i.e., ldquobranchrdquo) connection, 662 potential branch models are first synthesized and tested. Branch models that best match the EM results at all nonsynthesis frequencies are selected. For structures for which a compact lumped model is appropriate, this technique yields models that often provide direct physical insight into the electrical nature of the modeled structure. For electrically large structures, the technique is extended by the use of supplemental internal EM analysis ports. The technique is closed form; iteration is not used.
22 citations
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24 Feb 2009TL;DR: This paper presents a new approach for performing fast multiobjective optimization of the design of moving nonlinear electromagnetic (EM) devices using parametric reduced order EM field models that minimizes the high computational costs that arises from the frequent evaluation of large scale spatially discretized EM field Models.
Abstract: This paper presents a new approach for performing fast multiobjective optimization of the design of moving nonlinear electromagnetic (EM) devices using parametric reduced order EM field models. The approach minimizes the high computational costs that arises from the frequent evaluation of large scale spatially discretized EM field models during the optimization process run. The performance of the proposed approach is demonstrated by carrying out a multiobjective design optimization of an electromagnetic device with a moving component and nonlinear material properties.
22 citations
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17 May 2015TL;DR: In this paper, the evolution of the transverse correlation with increasing distance is investigated analytically and numerically, and the authors show that in the far-field, the field cross correlation functions depend only on the coordinate differences.
Abstract: In this work the evolution of the transverse correlation with increasing distance is investigated analytically and numerically. To characterize a stochastic EM field by measurements we have to sense the electromagnetic field in pairs of sampling points and to compute the correlations of all pairs. In the far-field, the field cross correlation functions depend only on the coordinate differences. This yields a considerable reduction of the measurement effort.
22 citations
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24 Aug 2004TL;DR: In this paper, a field expansion of the solution to three-dimensional electromagnetic problems in a material characterized by the general gyrotropic media is presented, where the electromagnetic fields are represented in a compact form and the general expressions of the fields are found to be reducible to those existing results for simplier cases.
Abstract: This letter presents a field expansion of the solution to three-dimensional electromagnetic problems in a material characterized by the general gyrotropic media. Both $overlinemmbepsilon$ and $overlinemmbmu$ tensors are gyrotropic, specified by six components and considered in the present analysis under spherial coordinates. Electromagnetic fields in general gyrotropic media are solved by using the method of separation of variables. Much effort is paid to the solution of a coupled set of second-order differential equations. Some specific situations of the parameters are investigated in detail. By properly grouping some terms, the electromagnetic fields are represented in a compact form. Compared to the existing results in the spherical coordinate system, the material properties investigated in this letter are more general. The general expressions of the fields are found to be reducible to those existing results for simplier cases.
22 citations