Exact conditions for virtual boundaries in the FDTD-method in studies of resonance waveguide inhomogeneities

The exact conditions at the virtual boundaries are formulated and correctly built into computational schemes of the FDTD-method, which is used for analysis of the transient processes in resonance waveguide inhomogeneities. By this means the problem of efficient limitation of the calculation space, which is the main problem of the method, is solved.