Abstract
AbstractIn this paper, a subgridding method is proposed for the two‐dimensional Complex Nonstandard FDTD (CNS‐FDTD) method. Taking into account the characteristics of the CNS‐FDTD method, new spatial interpolation, difference operator interpolation, and time interpolation are introduced. In order to demonstrate the usefulness of the proposed subgridding method, it is compared with the cases in which linear interpolation and quadratic interpolation of the conventional method are used for the main grids and local grids. It is found that the present subgridding method is superior to the conventional method in terms of stability and accuracy. Further, in the scattering analysis of a large rectangular cavity loaded with a lossy medium, the present subgridding method demonstrated substantial improvement in computation time and number of grids over CNS‐FDTD calculations with the local grid width over the entire space. As a subgridding method, a connection method is explained in a general case where the spatial division ratio of the main grids and local grids is 1:3. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 87(8): 1–9, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20078
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