Non-Standard Finite-Difference Time-Domain (NS-FDTD) Method Stable Subgrid Technique
The FDTD technique is frequently employed for radar cross section (RCS) prediction of aircraft, despite its well-known dispersion errors. Typically, an aircraft exhibits an electrical size ranging from approximately 500λ to 1800λ, where λ denotes the radar wavelength. Unfortunately, along the axial direction, the effective FDTD wavelength can reach 7λ to 25λ; values that are unacceptable for the design and analysis of modern air vehicles. In contrast, the Non-Standard Finite-Difference Time-Domain (NSFDTD) Method NS-FDTD scheme yields zero dispersion error under the same conditions.
In this presentation, we propose a 3D subgrid model for NS-FDTD method; enhancing the subgrid model by implementing a novel boundary connection algorithm and applying multiple Gaussian smoothing filters. These improvements enabled stable simulations exceeding two million iterations, compared with 0.2 million iterations previous year, with artificial loss reduced to one-tenth of previous levels.
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- 10555 W Flagler St,
- miami, Florida
- United States 33174
- Room Number: EC 3960
Speakers
YASUSHI KANAI of IEEE
Non-Standard Finite-Difference Time-Domain (NS-FDTD) Method Stable Subgrid Technique
Biography:
Dr. YASUSHI KANAI
Niigata Institute of Technology,
Kashiwzaki, Japan
kanai@iee.niit.ac.jp.
Yasushi KANAI is a Professor Emeritus and Research Fellow at Department Engineering, Niigata Institute of Technology, Kashiwazaki, Japan. He authored and co-authored 207 Reviewed Journal Papers, 284 International Conference Records, and more than 270 National Conference Records as of Oct.20, 2025. In addition, he has several book chapters. He specializes in micromagnetic analysis in energy-assisted magnetic recording heads as well as in wave propagation using non-standard finitedifference time-domain (NS-FDTD) analysis.
He was a co-chair of IEEE Conference on Electromagnetic Field Computations (CEFC), which was held online in Nov. 2020, Executive Committee Chairman, The 35 Annual Conference of the Magnetics Society of Japan in Sep. 2011. Prof. Kanai is a Life Senior Member of IEEE and a Fellow of Applied Computational Electromagnetics Society (ACES).