A CONSISTENT SUBGRIDDING SCHEME FOR THE FINITE-DIFFERENCE TIME-DOMAINMETHOD

Recently, the simulation of high frequency devices has become of incre asing importance due to the demand for faster development processes. T he Finite Difference Time Domain (FDTD) method has been proved to be a n efficient tool for the simulation of electromagnetic phenomena. In t he paper we derive a new consistent three-dimensional subgridding sche me for the Finite Integration Technique. In the time domain the latter method reduces to FDTD when only cubical cells are used. The subgridd ing extension can help to achieve accurate models of small structure d etails without heavily decreasing numerical efficiency while the prope rties of continuous Maxwell equations are still conserved in the grid space. After studying numerical dispersion and stability, the applicab ility of the method is demonstrated by regarding an example studying s cattering at a small post in a rectangular waveguide.