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A fast filter optimization scheme based on model order reduction

This paper presents a novel, fast optimization technique that is especially suitable for the design of microwave filters. For the discretization of the structure, the well established Finite Integration Technique (FIT) is used. A recently published two step Model Order Reduction (MORe) technique computes the poles and residuals of the structure's impedance matrix as well as its sensitivity to the geometry parameters. The actual optimization is then performed in the reduced order space of the poles and residuals. This significantly reduces the number of full-wave simulation runs, that is usually associated with the optimization of filters.