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Radar remote sensing of earth surfaces is by transmitting and receiving scattering signals from random surface and volume scatters, from which the target information content can be derived. Recently, more and more attentions are focused on random scatter properties in view of SAR imaging, for example, sea surface, ice or vegetative covers, bare soil, et al‥ Besides theoretical and numerical studies,...
A combined field integral equation (CFIE)-based electromagnetic solver is presented for solving scattering from a composite object. The object is first decomposed into multiple bodies according to its material property. Then the finite element-boundary integral method is applied to model bodies with complicated materials, and the method of moments is employed to model bodies with homogeneous or conducting...
A gradient-based shape optimization scheme combined with an interface-enriched generalized finite-element method (IGFEM) is proposed to efficiently optimize electro-magnetic (EM) problems. To avoid mesh distortion or the expensive process of repeatedly creating a conformal mesh for each design configuration, the problem geometry is projected onto a fixed background mesh that is not necessarily conformal...
In this paper, the time-domain finite element method (TDFEM) is employed to analyze the high power breakdown in air. During the breakdown process, the motion of free electrons generates plasma currents, which produce secondary fields that couple back into the externally applied fields and interact with the free electrons. Such a breakdown process can be described by a coupled electromagnetic-plasma...
Numerical modeling of electromagnetic problems becomes very challenging when large systems with complex structures need to be designed. This paper proposes a novel second-order transmission condition (SOTC) for the non-conformal finite element domain decomposition method (NC-FEM-DDM), which can be implemented efficiently on non-conformal interfaces via a Gaussian integration. The proposed SOTC is...
Surface integral equations (SIEs) are commonly used in the solution of electromagnetic scattering and radiation problems. Among various SIEs, the magnetic-field integral equation (MFIE) and the Müller formulation, when solved using a traditional moment method, are known to have worse accuracy but faster iterative convergence compared to the electric-field integral equation and the Poggio-Miller-Chang-Harrington-Wu-Tsai...
The electromagnetic dual-primal finite element tearing and interconnecting (FETI-DPEM) method is a non-overlapping domain decomposition method developed for the finite element analysis of large-scale electromagnetic problems. The method is particularly suitable for simulating large finite arrays because the geometrical repetitions of an array structure can be exploited to further enhance the computation...
This paper proposes a new hybrid algorithm, which is referred to as FETI-DP-BI, to solve antenna array radiation and scattering problems in electromagnetic simulation. Our mathematical treatment is based on the combination of the dual-primal finite element tearing and interconnecting (FETI-DP) and boundary integral (BI) methods. Decomposed interior FE domains are glued together by the Robin transmission...
A new formulation based on stretched coordinates is developed for perfectly matched layers (PML). The new PML can have multiple poles in contrast to the regular PML with a single pole. The implementation is also derived and the preliminary results are shown to be better than the regular PML with insignificant increase in the computational cost
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