Electromagnetic Field Analysis of Composite Uniaxial Anisotropic Dielectric Ring Loaded Cylindrical Cavity in Hydrogen Maser

Cao, Yu; Lu, Sheng; Feng, Kai

doi:10.1109/apmc.2005.1606328

Cited by 1 publication

(1 citation statement)

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“…Due to the difference in the expansion coefficients between sapphire and the cavity wall (Ti), when the temperature shifts T , the height of sapphire and the Ti cavity changes from h to h 1 and h 2 , respectively. The resonant frequency change with temperature can be written as [15,16] 1…”

Section: Theoretical Calculation and Analysismentioning

confidence: 99%

Frequency–temperature compensated sapphire loaded cavity for compact hydrogen masers

Wang

Yang²,

Zhou³

et al. 2008

Metrologia

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We report some theoretical and experimental results about a frequency-temperature compensated sapphire loaded cavity for compact hydrogen maser atomic clocks. Based on theoretical calculations, the frequency-temperature coefficients in the TE 0 1 1 mode of a sapphire cavity associated with two small rings of SrTiO 3 can be reduced. For instance, at 50 • C, when the thickness of the SrTiO 3 ring is 5 mm, the frequency-temperature coefficient can be reduced by about five times, and in the meantime, the quality factor can be kept at above 40 000 synchronously. A sapphire loaded cavity and eight small compensated chips of SrTiO 3 were prepared and a combined cavity of sapphire with SrTiO 3 chips was simulated by the finite element method and measured by experiments. The simulation and the related experimental results agree well. In addition, the frequency-temperature coefficients in two different configurations of eight SrTiO 3 chips were also measured and compared.

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Section: Theoretical Calculation and Analysismentioning

confidence: 99%