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In this paper, an integral equation scheme for modeling resonant coils applied in wireless power transfer systems is presented. An A − Φ formulation is applied with current and charge densities on the wire surface as unknowns. This method overcomes the limitation of the “thin-wire approximation” as it enables the unknowns to vary on the wire surface. Thus, proximity effects (that typically emerge...
In this paper, the uncertainty of electric properties of wireless power transfer systems due to uncertain geometric design parameters is analyzed. An electromagnetic simulation tool, based on an integral formulation, is coupled with a stochastic method that quantitatively determines the contribution of each uncertain design variable to the output uncertainty in terms of Sobol' indices. A generalized...
The radar cross section of small-sized unmanned aerial vehicles can be extremely low, making the perception of such objects impossible by standard radar techniques. However, the typical propeller size of these vehicles gives rise to a resonant behavior at some commonly used radar frequency bands. Around the resonant frequency, the radar cross section of the propeller highly depends on the incident...
The utilization of Graphical Processing Units (GPUs) for the element-by-element (EbE) finite element method (FEM) is demonstrated. EbE FEM is a long known technique, by which a conjugate gradient (CG) type iterative solution scheme can be entirely decomposed into computations on the element level, i.e., without assembling the global system matrix. In our implementation, NVIDIA's parallel computing...
In this paper, the characterization of electromagnetic inverse problems is addressed. As it is well known, an inverse problem can be ill-posed, i.e., its solution is not necessarily unique and might be quite sensitive to the measured data. To characterize such an inverse problem a combination of a surrogate model —based on an optimal database— and an inverse mapping of some sort, both using kriging...
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