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IEEE Transactions on Antennas and Propagation
Volume 48 Number 4, April 2000

Signal-Processing Techniques to Reduce the Sinusoidal Steady-State Error in the FDTD Method

Page 585.

Abstract:

Techniques to improve the accuracy of the finite-difference time-domain (FDTD) solutions employing sinusoidal excitations are developed. The FDTD computational domain is considered as a sampled system and analyzed with respect to the aliasing error using the Nyquist sampling theorem. After a careful examination of how the high-frequency components in the excitation cause sinusoidal steady-state errors in the FDTD solutions, the use of smoothing windows and digital low-pass filters is suggested to reduce the error. The reduction in the error is demonstrated for various cases.

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