The finite-difference time-domain(FDTD)method is used effectively to solve electromagnetic(EM)scattering and radiation problems using a 3D sub-gridding *** accuracy and stability of the FDTD method,the computational d...
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The finite-difference time-domain(FDTD)method is used effectively to solve electromagnetic(EM)scattering and radiation problems using a 3D sub-gridding *** accuracy and stability of the FDTD method,the computational domain of EM problems with locally fine structures or electrically small objects is discretized with finer *** sub-gridding algorithm for different regions of the computational domain was implemented to increase the accuracy and reduce the computational time and memory requirements compared to those of the traditional FDTD *** the sub-gridding algorithm,the FDTD computational domain is divided into separate regions:coarse grid and fine grid *** the cell sizes and time steps are different in the coarse and fine grid regions,interpolations in both time and space are used to evaluate the electric and magnetic fields on the boundaries between different *** accuracy of the developed 3D sub-gridding algorithm has been verified for radiation and scattering problems,including multiple fine grid *** performance is obtained even for higher and different contrast ratios in fine grid regions.
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