Rapid Evaluation of Macromodel Response with the FDTD Method

Full wave electromagnetic simulation requires numerically expensive methods such as FDTD. The computation time depends superlinearly on the number of unknowns in the simulation region. In some situations, especially when the results are not needed at every point of the grid, simulation time can be reduced. This reduction can be accomplished by partitioning the grid into macromodels and determining the macromodel impulse response. Then the impulse response can be decomposed into its eigenmodes, some of which can be eliminated because they are non-essential. In this paper we extend our earlier work and describe several strategies with which macromodels can be interconnected, that result in further savings of computation time.