Efficient FDTD method for analysis of left-handed mushroom structure using system identification method

An FDTD method, combined with system identification (SI), thin wire and thin slot algorithms for the analysis of periodic mushroom structure based metamaterials, is proposed. The SI method provides a significant reduction in computation time by determining the auto-regressive moving-average (ARMA) model using least-squares method. This proposed method is suitable for analyzing problems involving fine structural details and long computation time. An example of a mushroom structure is investigated to compare the results between simulation and measurement.