Presented in this paper is a new approach to deriving a numerical absorbing condition (NABC) for mesh truncation in the Finite Difference/Finite Element Methods (FD/FEM) analysis of scattering and radiation by periodic structures. Through imposing the absorption condition on a selected set of Floquet models at the truncation boundary, the NABC is obtained. The proposed approach preserves the sparsity of the FD/FEM matrices, unlike the boundary element method or matching to Floquet mode series. The accuracy of the method has been demonstrated for a number of 2D examples. Extension of the present formulation to the full 3D formulation is currently under investigation and the initial results look quite promising.
|Number of pages||4|
|Journal||IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)|
|State||Published - 1994|
|Event||Proceedings of the IEEE Antennas and Propagation International Symposium. Part 3 (of 3) - Seattle, WA, USA|
Duration: 19 Jun 1994 → 24 Jun 1994