Wideband finite difference time domain implementation of surface impedance boundary conditions for good conductors

The authors present a one-dimensional implementation for a surface impedance boundary condition for good conductors in the finite-difference-time-domain (FDTD) technique. In order to illustrate the FDTD surface impedance boundary conditions, a planar air-lossy dielectric interface is considered. Overall, the surface impedance boundary condition implementation works well in eliminating the conductor volume from the solution space. This method has a distinct advantage over other possible implementations because the coefficients of the exponential approximation of the impulse response are independent of the conductivity of the scattering object and do not need to be reevaluated for different conductivities.<>