Microstrip Combline Bandpass Filter with Tuning Range Enhancement and Bandwidth Tunability Using Resonator Loaded Series Varactor and SLR

Conference Title: 2022 14th German Microwave Conference (GeMiC)Conference Start Date: 2022, May 16 Conference End Date: 2022, May 18 Conference Location: Ulm, GermanyA new microstrip combline filter with adjustable center frequency and bandwidth is proposed. The design is based on a double sided varactor loaded resonators and a resonant defected ground structures. Detailed filter design equations are given and explained. To validate the proposed structure, a second-order prototype filter is designed and fabricated with a relative bandwidth of 10 to 15 % and a tuning range of 95 %.

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