Impedance Control for Critically Coupled Cavities

Bill Riddle, Craig Nelson

Abstract:	Cavity resonators are often used in low phase noise oscillators that utilize carrier suppression. These oscillators are employed in systems that measure phase noise in frequencies as high as 100 GHz. In order to achieve the maximum suppression needed in these low noise designs, the cavity must be operated at critical coupling. However, this large coupling level loads the cavity, which significantly lowers its quality factor and shifts its resonant frequency. In this paper, we present a matching technique that can be used to minimize these loading effects by controlling the input impedance of the cavity and optimizing its response at resonance, thus producing the maximum amount of carrier suppression.
Published in:	Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting August 29 - 31, 2005 Vancouver, Canada
Pages:	488 - 493
Cite this article:	Riddle, Bill, Nelson, Craig, "Impedance Control for Critically Coupled Cavities," Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting, Vancouver, Canada, August 2005, pp. 488-493.
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