A FDTD HYBRID "M3d24 -YEE" SCHEME WITH SUBGRIDDING FOR SOLVING LARGE ELECTROMAGNETIC PROBLEMS
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A FDTD HYBRID摘要
A hybrid scheme consisting of a modified second order in time- fourth order in space finite-difference time-domain (FDTD) scheme "M3d24 " and the Yee algorithm, with subgridding is introduced to overcome the errors of applying the 4th order in space FDTD at the interfaces of perfect electric conductors (PEC) or dielectric scatterers. This hybrid scheme is based on applying the Yee algorithm in the vicinity of the scatterer using a high resolution grid (number of points per wavelength), and the M3d24 scheme in the other regions using a low resolution grid in order to reduce the required computer storage for large problems, while still good accuracy. The results of this hybrid scheme are shown to agree well with the results of the Yee algorithm using a high resolution grid, for problems of plane wave scattering from PEC cubes, spheres.
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