Eliminating Interface Reflections in Hybrid Low-Dispersion FDTD Algorithms
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Eliminating Interface Reflections in Hybrid Low-Dispersion FDTD AlgorithmsAbstract
The numerical phase mismatch across FDTD lattice layers with different sets of update equations has been investigated. A predictive equation of numerical reflections across high-order/low-order layers has been derived. Based on this equation the standard Yee (S22) update equations have been modified to allow their implementation around PEC boundaries and other special situations in an otherwise global high-order implementation, while keeping spurious reflections at the hybrid interface to a practical minimum and independent of the traversing wave direction. S22 Phase matching has been developed and verified in both S24 and M24 high-order hybrid algorithms.
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