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High-Q TE stabilized sapphire microwave resonators for low noise applications

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4 Author(s)
Tobar, M.E. ; Dept. of Phys., Univ. of Western Australia, Nedlands, WA, Australia ; Giles, A.J. ; Edwards, S. ; Searls, J.

Two low-noise high-Q sapphire loaded cavity (SLC) resonators, with unloaded Q values of 2 × 105 and very low densities of spurious modes have been constructed. They were designed to operate at 0°C with a center frequency of 10.000000 GHz. The cavity was cooled with a thermoelectric (TE) Peltier element and in practice achieved the required center frequency near 1°C. The resonator has a measured frequency-temperature coefficient of -0.7 MHz/K and a Q-factor which is measured to be proportional to T2.5. An upper limit to the SLC residual phase noise to L(100 Hz) = -147.5 dBc/Hz, L(1 kHz) = -155 dBc/Hz, and L(10 kHz) = -160 dBc/Hz has been measured. The authors have created a free running loop oscillator based on the SLC resonator and measured its frequency noise using the other as a discriminator

Published in:

Frequency Control Symposium, 1993. 47th., Proceedings of the 1993 IEEE International

Date of Conference:

2-4 Jun 1993