CHARACTERISTICS OF 3D DISTRIBUTED NODE TLM MESH WITH CELLS OF ARBITRARY ASPECT RATIO

The paper describes a modification of the transmission line matrix (TL M) method of numerical analysis in three dimensions. The traditional 3 D distributed node (cubic cell) TLM algorithms are generalized for cub oid cells of arbitrary aspect ratio. The basic theory of the cuboid 3D distributed node is described in detail. A full dispersion analysis o f the cuboid mesh is performed for the general case, and the results a re compared to the characteristics of the traditional cubic mesh. Some applications are shown in this paper. Numerical results for a canonic al rectangular waveguide cavity are compared with those obtained with a cubic cell to demonstrate the validity of the algorithm. Based on th ose comparisons, we demonstrate that the cuboid cell offers greater fl exibility in discretization and can save memory as well as CPU time.