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Practical Implementation of Frequency Monitoring for Widely Tunable Bandpass Filters
Keywords: Microwave components, Tunable filters, Advanced manufacturing
In the present work, a practical method to integrate sensing mechanism into widely tunable evanescent-mode cavity resonators for tracking the center frequency is introduced. This mechanism allows for in-situ monitoring and outputs a signal that can be used to generate a closed loop feedback to lock in the center frequency of the resonator. The major benefit of this mechanism is that the performance of a resonator is not sacrificed since the observed mode is a higher order differential mode which is orthogonal to the fundamental mode of the resonator. The resonator is created inside a standard printed circuit board using 3-dimensional laser patterning to allow the existence of the differential mode. An example resonator is fabricated to demonstrate the concept and tuned from 3 to 6 GHz while monitoring the differential mode at 7 to 13 GHz. The resonator is compared to an identical resonator without the sensing mechanism to show the effect on the unloaded quality factor. A continuous feedback is a crucial step towards a robust fielded widely tunable filter.
Hjalti H. Sigmarsson, Research Assistant
Purdue University
West Lafayette, IN

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