A three-dimensional subgridding algorithm for the finite difference time domain (FDTD) method is proposed in this paper. The method is based on interpolation of electric and magnetic current densities. The coarse-fine mesh ratio can be either 1:2 or 1:3. Results of a test model utilizing a lossless cavity excited with a dipole show no tendency of instability after 500000 time steps. The reflection in time domain at the subgridding interface was calculated to test the accuracy of the subgridding algorithm.

Meeting Name

IEEE International Symposium on Electromagnetic Compatibility, 2004


Electrical and Computer Engineering

Keywords and Phrases

FDTD Algorithm; Coarse-Fine Mesh Ratio; Current Density; Dipole Excitation; Electric Current Density; Electromagnetic Compatibility; Electromagnetic Modeling; Finite Difference Time Domain Method; Finite Difference Time-Domain Analysis; Instability; Interpolation; Lossless Cavity; Magnetic Current Density; Subgridding Interface; Three-Dimensional Subgridding Algorithm

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 2004 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.