Optimized (2,4) FDTD Method for Conducting Media

The development of an optimized finite-difference time-domain method, designed for application in topologies involving lossy materials, is discussed in this paper. The proposed scheme retains the structural components of the standard (2,4) technique; however, it adopts operators that mitigate errors within desired frequency bands and, therefore, guarantee upgraded reliability. The key point is the special treatment of the difference expressions, initially defined in parametric forms. Specific optimization procedures are then employed, leading to enhanced approximations that moderate phase and amplitude inaccuracies. In this manner, performance improvement without aggravation of the entailed computational burden is achieved.