Perfectly matched plane wave source in FDTD via an efficient mixed time-frequency block filter formulation

The total field scattered field formulation (TF/SF) in the FDTD method is a powerful tool for simulating scattered fields reflected from objects with extremely complex geometries and heterogeneities. In this communication, we propose a mixed time and frequency domain solution to optimize the AFP memory storage by an integer M factor. We also provide a practical sampling condition to guarantee that the optimized AFP (O-AFP for short) grid always gives a perfect cancellation, a leakage error of -300 dB isolation if double precision format is employed.