A New Method to Avoid Reduction of Time Step in the CP-FDTD Method

A new CP-WCS FDTD method is developed to avoid the time step reduction in the conformal path FDTD method. The stability condition in this method is not related with the shape and size of the distorted cell, and the time step size in this method is only determined by the space discretization perpendicular to the curved metal surface. The CP-WCS FDTD method has the same accuracy as that for the CP FDTD method, and due to large time step size can be used, the CP-WCS FDTD has higher computation efficiency, which is demonstrated by numerical examples.