A dispersion-reduction scheme for the higher order (2,4) FDTD method

In this paper, a higher order (2,4) finite difference time domain (FDTD) method with enhanced dispersion properties is presented. The accuracy improvement stems from the application of a correctional technique, which is based on the systematic modification of the constitutive material parameters. Despite the scheme´s single-frequency nature, satisfactory wide-band performance is attained, while its general formulation also enables the mitigation of phase inaccuracies around specific directions of propagation. The proposed approach, which is easy to implement and computationally inexpensive, is evaluated through theoretical calculations and numerical experimentation.