Application of an offset mesh for the transient, explicit finite-difference analysis of the perfectly conducting rectangular plate

In this paper an offset mesh is used for the transient finite-difference analysis of the rectangular plate. An explicit, or time-marching, finite-difference approximation for the electric field integral equation is used. It is demonstrated that the offset mesh represents a more natural discretization for obtaining the current response of the plate than the standard (nonoffset) mesh typically used, but a stability criterion which differs from the one associated with the standard scheme is required. Results obtained from both the standard mesh and the offset mesh are compared, and the difference in the stability criterion required for each mesh is discussed.