Most microwave filters are currently designed using direct electromagnetic (EM) optimization. This method holds several disadvantages regarding the provided physical insight to designers and duration of the optimization process. To circumvent these drawbacks, we propose a filter design based on scalable circuit models. This model-driven design competes with EM optimization by maintaining the accuracy of the optimization results while providing a very significant speedup and gaining physical insight on the EM working mechanism of the filter of interest. This paper discusses the advantages of using the proposed model-driven design by the illustration on a defected ground structure filter. A scalable equivalent circuit model is used in the design procedure to provide physical insight to the designer and to speed up the design process enormously.

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Microstrip filters are widely used in modern microwave communication systems such as Wi-Fi, 5G and satellite navigation. This increasingly broad range of applications implies that the frequency spectrum becomes more and more crowded, resulting in more demanding filter specifications. To meet these design specifications, computationally expensive electromagnetic simulations are often used.To speed up the filter design flow, we introduced metamodels for design optimization and variability analysis tasks. This paper illustrates the advantages of using metamodels in filter design by use of a defected ground structure. The average CPU time of the design process decreases drastically, while achieving accurate results.

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Defected Ground Structures have multiple applications in the microwave domain, e.g., in the design of couplers, antennas, filters and filtennas. An accurate wide-band equivalent circuit model is proposed for Defected Ground Structures in this paper. This wide-band model can be used to model multiple resonances of a Defected Ground Structure with a single slot. Validation through measurements verifies the accuracy of the proposed model.Index terms-Circuit modeling, Defected Ground Structure (DGS), slotlines.