DSP-PML algorithm for open region DNG meta-material FDTD simulations

The digital signal processing (DSP) algorithms developed for digital filters and the perfectly matched layer (PML) formulations are incorporated with the finite difference time domain (FDTD) method to model open region double-negative (DNG) meta-material electromagnetic problems. In the proposed approach, the dielectric parameters of each FDTD unit cell are interpreted as an infinite impulse response digital filter which can be implemented efficiently using the transpose direct form II. A numerical example carried out in a two-dimensional domain is included to show the validity of the proposed formulation.