Dispersive contour-path algorithm for the FDTD analysis of a periodic structure at oblique incidence

Abstract

Arbitrarily-shaped dispersive media can be treated with the dispersive contour-path (DCP) FDTD method. We extend the DCP-FDTD method for the analysis of a periodic structure to the case at oblique incidence. A trapezoidal recursive convolution technique is used to incorporate dispersive media into the DCP-FDTD method. The transmission characteristics of a metallic cylinder array are evaluated and discussed. It is found that the present method gives almost the same solution as the conventional staircase FDTD method, even with a sampling width five times as large as the conventional counterpart.