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Application of stable FEM-FDTD hybrid to scattering problems

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2 Author(s)
Rylander, T. ; Dept. of Electromagn., Chalmers Univ. of Technol., Goteborg, Sweden ; Bondeson, A.

A recently developed, stable, finite-element method (FEM), finite-difference time-domain (FDTD) hybrid that eliminates the staircase approximation of complex geometries is tested by convergence studies for radar cross-sections. For a conducting sphere, 1 dB accuracy in all directions is obtained with nine cells per wavelength, whereas the NASA almond requires a higher resolution of about 15 cells per wavelength. For scatterers with a smooth boundary, the results converge quadratically with the mesh size, but for a horizontally polarized wave incident on the NASA almond, the order of convergence is lower because of singular fields at the tip

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Antennas and Propagation, IEEE Transactions on  (Volume:50 ,  Issue: 2 )