A simplified CFDTD algorithm for scattering analysis

The scattering calculation may be inaccurate while the conventional FDTD method in cartesian coordinates uses staircase approximation to model curvilinear surface. In tins paper, a simplified conformal FDTD (CFDTD) scheme is presented to overcome staircase error. Although the areas and lengths of the distorted cells are also employed in the same way of the previous CFDTD algorithm, this scheme uses a radio of 1/6 (the distorted cell area to the regular cell area) as a criterion to eliminate instability due to the very small distorted cell sizes To show the validity and applicable of the presented scheme, computed RCS´s are compared with that from the conventional FDTD. other methods and measured values.