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Temperature compensated cryogenic whispering gallery mode resonator for microwave frequency standard applications

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5 Author(s)
Ling Hao ; Centre for Basic & Thermal Metrol., Nat. Phys. Lab., Teddington, UK ; N. Klein ; J. C. Gallop ; W. J. Radcliffe
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We have investigated a miniature composite dielectric resonator employing a sapphire puck and a single crystalline platelet of rutile, excited in a whispering gallery mode. Modeling of the relative filling factors of the dielectric components is in good agreement with experiment. The loaded Q value at 17 GHz is as high as 3×106 . We have achieved values of the square-root of the Allan variance as low as 3×10-12 for an integration time of 1000 s with the prototype system. The high and resonator can also form the basis for a low-phase noise oscillator and we present data for the measured spectral density of phase noise

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IEEE Transactions on Instrumentation and Measurement  (Volume:48 ,  Issue: 2 )