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3-6 GHz Tunable Bandpass Filter using Heavily Loaded Evanescent-mode Cavity Resonators and Piezoelectric Actuators
Keywords: Tunable filter, Evanescent-mode resonator, Piezoelectric Actuator
In the present work, a widely tunable, high quality factor (Q), narrow bandpass filter is demonstrated using evanes-cent-mode cavity resonators as building blocks. The frequency and Q varia-tion of the evanescent-mode cavity are predicted using analytical expressions, which give design variables for the building blocks. A widely tunable evanescent-mode cavity resonator is fabricated to verify the theoretical analysis. The tunable filter can be tuned continuously from 3 to 6 GHz with a very narrow bandwidth (~0.58%). The filter is fabricated in low tem-perature co-fired ceramics with a low loss Rogers Duroid® flexible substrate forming the top of the filter and hosts the feed lines for the filter. The flexible substrate acts as a deformable membrane that allows variable frequency loading of each of the resonators. A commercially available piezoelectric actuator is mounted on the Duroid® substrate for precise electrical tuning of the filter center frequency. The narrow band filter demonstrates the potential of the tuning mechanism to compensate for fabrication tolerances, which are especially important for such a narrow bandwidth filter. The high-Q and the sensitive tuning combine to allow for high quality preselect filtering for a front-end receiver.
Hjalti H. Sigmarsson, Research Assistant
Purdue University
West Lafayette, IN

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