FDTD ABC FOR WAVE-GUIDES WITH A NEW DISCRETE GREENS-FUNCTION AND ITS EFFECTIVE IMPLEMENTATION

The authors propose a new discrete Green's function and an effective i mplementation for the absorbing boundary condition for the FDTD simula tion of waveguide problems. The Green's function is given analytically in a simple, closed-form formula. A simple exponential approximation method is used for an efficient ABC implementation.