Reducing the computational domain for FDTD scattering simulation using the sawtooth anechoic chamber ABC

A novel absorbing boundary condition (ABC), to be used with finite difference electromagnetic scattering simulation is described. This new ABC is based on modeling lossy anechoic chamber foam pyramids as a lattice terminating layer. The advantage of this absorbing boundary is that it prevents reflections from much wider incident angles than most currently used techniques, yet is conceptually straightforward, simple to implement, and particularly well-suited to parallel computer platforms. Finite Difference Time Domain (FDTD) simulations presented herein show that this sawtooth ABC reduces reflection artifacts compared to commonly-used pseudo-annihilation ABCs, such as Engquist-Majda, second order Mur, and Bayliss-Turkell.<>