Dispersion-Error Optimized ADI FDTD

ADI-FDTD method is efficient in solving fine RF/microwave structures due to its unconditionally stable characteristics. However, it suffers from large dispersions with the increase of time steps. In this paper, an error-minimized ADI-FDTD method is proposed that is less dispersive as compared to the conventional ADI-FDTD method. It is formulated in such a way that no extra memory or simulation time is required in its computations. It is still unconditionally stable but with much less dispersion errors. Numerical examples are presented to demonstrate its efficiency and accuracy.

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Dalhousie University
Canada

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