TY - JOUR
T1 - Numerical Solutions of the Electromagnetic Scattering by Overfilled Cavities with Inhomogeneous Anisotropic Media
AU - Zhao , Meiling
AU - He , Jiahui
AU - Wang , Liqun
JO - Communications in Computational Physics
VL - 2
SP - 530
EP - 562
PY - 2023
DA - 2023/09
SN - 34
DO - http://doi.org/10.4208/cicp.OA-2022-0104
UR - https://global-sci.org/intro/article_detail/cicp/21998.html
KW - Electromagnetic scattering, overfilled cavity, inhomogeneous anisotropic media, non-body-fitted grids, Petrov-Galerkin finite element interface method.
AB - <p style="text-align: justify;">In this paper, the electromagnetic scattering from overfilled cavities with inhomogeneous anisotropic media is investigated. To solve the scattering problem, a Petrov-Galerkin finite element interface method on non-body-fitted grids is presented. We reduce the infinite domain of scattering to a bounded domain problem by introducing a transparent boundary condition. The level set function is used to capture complex boundary and interface geometry that is not aligned with the mesh. Non-body-fitted grids allow us to save computational costs during mesh generation and significantly reduce the amount of computer memory required. The solution is built by connecting two linear polynomials across the interfaces to satisfy the jump conditions. The proposed method can handle matrix coefficients produced by permittivity and permeability tensors of anisotropic media. The final linear system is sparse, making it more suitable for most iterative methods. Numerical experiments show that the proposed method has good convergence and realizability. Meanwhile, we discover that the absorbing properties of anisotropic media clearly and positively influence the reduction of radar cross section. It has also been demonstrated that the method can achieve second-order accuracy.</p>