TY - GEN
T1 - Practical implementation of frequency monitoring for widely tunable bandpass filters
AU - Sigmarsson, Hjalti H.
AU - Binkerd, Evan
AU - Maas, Jeff
AU - Lee, Juseop
AU - Peroulis, Dimitrios
AU - Chappell, William J.
PY - 2010
Y1 - 2010
N2 - 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
AB - 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
KW - Front-end receiver
KW - High quality factor
KW - Microwave packaging
KW - Software defined radio
KW - Tunable filters
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M3 - Conference contribution
AN - SCOPUS:84878180557
SN - 9781617823206
T3 - 43rd International Symposium on Microelectronics 2010, IMAPS 2010
SP - 874
EP - 880
BT - 43rd International Symposium on Microelectronics 2010, IMAPS 2010
T2 - 43rd Annual IMAPS International Symposium on Microelectronics, IMAPS 2010
Y2 - 31 October 2010 through 4 November 2010
ER -