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In this paper, a compact multilayer dual-band and tri-band filters based on grounded spiral resonators are proposed. The filters are realized on two stacked substrates: Taconic CeR-10 substrate and Kapton foil, where the feeds are positioned in the upper layer whereas resonators are placed in the middle layer between feed lines and the ground. The proposed dual-band filter operates at 0.68/0.82 GHz...
In this work, a very compact dual-band filter based on folded quarter-wavelength resonators is proposed. Specific configuration of the filter results in four independently controlled transmission zeros which provide very high selectivity of the passbands. The proposed configuration is analysed in detail and a design procedure is presented. To demonstrate the feasibility of the proposed approach, two...
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