An unconditionally stable split-step FDTD method for low anisotropy

作者：Kusaf Mehmet^*; Oztoprak Abdullah Y

来源：IEEE Microwave and Wireless Components Letters, 2008, 18(4): 224-226.

DOI：10.1109/LMWC.2008.918865

• alternating direction implicit finite-differencetime-domain (ADI FDTD)
• split-step FDTD
• unconditionally stable FDTD methods

Split-step unconditionally stable finite-difference time-domain (FDTD) methods have higher dispersion and anisotropic errors for large stability factors. A new split-step method with four sub-steps is introduced and shown to have much lower anisotropy compared with the well known alternating direction implicit finite-difference time-domain (ADI-FDTD) and other known split step methods. Another important aspect of the new method is that for each space step value there is a stability factor value that the numerical propagation phase velocity is isotropic.

• 出版日期2008-4