Abstract
The Finite Volume Time-Domain (FVTD) method is an effective full-wave technique which allows an accurate computation of the electromagnetic field. In order to analyze the scattering effects due to electrically large structures, it can be combined with methods based on high-frequency approximations. This paper proposes a hybrid technique, which combines the FVTD method with an asymptotic solver based on the physical optics (PO) and the equivalent current method (ECM), allowing the solution of electromagnetic problems in the presence of electrically large structures with small details. Preliminary numerical simulations, aimed at computing the radar cross section of perfect electric conducting (PEC) composite objects, are reported in order to evaluate the effectiveness of the proposed method.
Highlights
Several electromagnetic problems require solvers able to characterize complex and multi-scale structures [1,2,3,4]
Common solvers belonging to such a class are the method of moments (MoM) [5], the finite-difference time-domain (FDTD) [6] and finite-difference frequency-domain (FDFD) [7] methods, the finite integration technique (FIT) [8], the finite-element method (FEM) [9], and the method of lines (MOL) [10]
In this case, the incident field is represented by the primary field scattered by the Finite Volume Time-Domain (FVTD) region in the points belonging to the asymptotic region
Summary
Several electromagnetic problems require solvers able to characterize complex and multi-scale structures [1,2,3,4]. Being very effective in several practical applications, these approaches have the drawback that the computational requirements usually increase significantly when very large (in terms of wavelengths) radiating or scattering structures are considered In such cases, high-frequency techniques based on asymptotic approximations are frequently adopted. When targets composed by large and small scatterers are concerned, hybrid methods, in which full-wave and high-frequency techniques are combined together, can be adopted. The proposed hybrid technique is extended for the first time in order to include more scattering contributions from the asymptotic region To this end, the PO approximation is adopted for computing the scattered fields from smooth surfaces, whereas the Equivalent Current Method (ECM) [11] is used for including the effects of the edges.
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