The perfectly matched layer (PML) is a highly accurate approach to the finite difference time-domain (FDTD) mesh truncation.However
the PML does enhance increase the computational complexity and the memory requirement for the FDTD simulation.In this paper
we propose a new PML construction based on the properties of the split fields in the PML region.The construction only contains eight PML subsections without corners.Also
we transform a three-dimensional split field component to a two-dimensional array in order to save computer memory.Verifications of the PML construction are provided with numerical examples.