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Reduced order modelling of microwave components by means of higher-order finite-element method

The paper addresses several problems related to automated construction of reduced order models that are used to achieve very fast fast frequency sweeps in full-wave simulations of microwave components by means of finite-element method. Four error estimators are presented and examined. Also the correlation between models constructed from FEM matrices of various size, obtained using higher-order basis functions in FEM, is investigated, as well as the impact of the choice of the expansion point on the distribution of error in the simulation band. The findings of this study provide useful guidelines for developing fast FEM code with wideband frequency sweeps acceleration.