Practical implementation of frequency monitoring for widely tunable bandpass filters

Hjalti H. Sigmarsson, Evan Binkerd, Jeff Maas, Juseop Lee, Dimitrios Peroulis, William J. Chappell

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In the present work, a practical method to integrate sensing mechanisms into widely tunable evanescentmode 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 that can be used 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 higher order differential mode used for monitoring 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 3.62 to 6.85 GHz. The differential mode was monitored to be at a frequency 1.8 times higher than the common mode. The unloaded quality factor of the resonator is extracted from measurements to verify that the sensing mechanism does not induce any additional losses. Continuous feedback is a crucial step towards a robust fielded widely tunable filter. Copyright

Original languageEnglish
Title of host publication43rd International Symposium on Microelectronics 2010, IMAPS 2010
Pages874-880
Number of pages7
Publication statusPublished - 2010
Externally publishedYes
Event43rd Annual IMAPS International Symposium on Microelectronics, IMAPS 2010 - Raleigh, NC, United States
Duration: 2010 Oct 312010 Nov 4

Publication series

Name43rd International Symposium on Microelectronics 2010, IMAPS 2010

Other

Other43rd Annual IMAPS International Symposium on Microelectronics, IMAPS 2010
CountryUnited States
CityRaleigh, NC
Period10/10/3110/11/4

Keywords

  • Front-end receiver
  • High quality factor
  • Microwave packaging
  • Software defined radio
  • Tunable filters

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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