Here is the abstract you requested from the IMAPS_2010 technical program page. This is the original abstract submitted by the author. Any changes to the technical content of the final manuscript published by IMAPS or the presentation that is given during the event is done by the author, not IMAPS.
|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
West Lafayette, IN