Extended BOR-FDTD algorithm for the analysis of cylindrical guided-wave structures and antennas

In this research, a cylindrical, nonuniform finite difference time domain technique is developed for solving Maxwell's equations with body of revolution (BOR) geometries. The rotational symmetry of structures enables us to employ a two-dimensional (2D) finite difference lattice in the field timestepping procedure by projecting a three-dimensional (3D) Yee cell in cylindrical coordinates (r, /spl phi/, z) onto the (/spl rho/, z) plane. The perfectly electric conductor (PEC) or the anisotropic perfectly matched layer (APML) is used to truncate the computational domain in the /spl rho/ and z-axes. Extensive numerical results have been derived for various cylindrical guided-wave structures and horn antennas, and these results have been compared with those available in the literature. Excellent agreement and great efficiency have been observed for all of the cases investigated in this research.