[数值]FDTD Schemes With Minimal Numerical Dispersion

Abstract—A novel formulation of hybrid finite-difference ?\GILB,  
time-domain (FDTD) methods is presented. Significant reduction @a AR99M  
of numerical dispersion is achieved by the proposed FDTD A]fN~PR  
methods that combine the second-order and higher-order finite- `rt  
differences. Also, the proposed FDTD methods exhibit  xc%\%8C}  
significantly higher solution accuracy than the accuracy of standard I3;{II  
FDTD schemes as a result of partial mutual cancellation of 5r=xhOe`  
numerical errors provided by the developed FDTD update procedure. !
.\EU*)1  
The residual numerical error of the phase velocity remains c7$L:  
low even for sampling of a few points per wavelength. Also, the L*k[Vc  
FDTD schemes based on the proposed approach are faster and OnNWci|7  
more accurate than the corresponding purely higher-order FDTD< .. s>=DfE-;"  
%SKp<>;9  

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好新哟，谢谢