An updated equation of the 3-D isotropic dispersion finite-difference time-domain (ID-FDTD) scheme is proposed for a rectangular grid. The scaling and weighting factors are formulated to reduce the anisotropic dispersion error. Especially, the least mean square (LMS) method is used to calculate the weighting factors to minimize the fluctuation of the dispersion over an entire spatial domain. The dispersion behavior of the proposed ID-FDTD scheme is characterized. Then, the formulated 3-D ID-FDTD scheme is verified for two scattering problems.
Bibliographical noteFunding Information:
Manuscript received April 19, 2010; revised May 13, 2010; accepted May 18, 2010. Date of publication May 27, 2010; date of current version June 10, 2010. This work was supported in part by the Agency for Defense Development, South Korea (UC080039FD). W.-T. Kim and J.-G. Yook are with the Department of Electrical and Electronics Engineering, Yonsei University, Seoul 120-749, South Korea. I.-S. Koh is with the Graduate School of Information Technology and Telecommunication, Inha University, Incheon 402-751, South Korea (e-mail: email@example.com). Color versions of one or more of the figures in this letter are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/LAWP.2010.2051313
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering