Absorbing Performance of the Nearly PML with the CFS Factor

Abstract

The nearly perfectly matched layer (NPML) with the complex frequency-shifted (CFS) factor, named here as the CFS-NPML, is proposed to truncate the finite-difference time-domain (FDTD) grids. To estimate the absorbing performance of the proposed CFS-NPML, we simulate the radiation of a dipole antenna in three-dimensional (3-D) free space. The simulation results demonstrate that the CFS-NPML significantly enhance the absorbing performance compared with the original NPML.