Frequency -temperature analysis of sapphire ring dielectric-loaded cylindrical cavity in hydrogen maser atomic frequency standard

Cao, Yu; Shanwei, Lue; Feng, Kai

doi:10.1109/aprasc.2004.1422386

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…According to Maxwell's equation, the following characteristic equation of the TE 0 1 1 mode in the sapphire loaded cavity can be obtained [14]:…”

Section: Theoretical Calculation and Analysismentioning

confidence: 99%

“…For the sapphire cavity used in our compact hydrogen maser (BIRMM, China), according to some previous results [12][13][14], at 50 • C and 1.42 GHz, τ ⊥1 and τ ⊥2 perpendicular to the c-axis of the cavity are 90 ppm K −1 and 215 ppm K −1 for sapphire and SrTiO 3 , respectively; τ α1 is 4.5 ppm K −1 , τ α2 is 5.3 ppm K −1 and τ c is 8.6 ppm K −1 .…”

Section: Theoretical Calculation and Analysismentioning

confidence: 99%

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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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“…According to Maxwell's equation, the following characteristic equation of the TE 0 1 1 mode in the sapphire loaded cavity can be obtained [14]:…”

Section: Theoretical Calculation and Analysismentioning

confidence: 99%

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

Cao

Feng³

2005 Asia-Pacific Microwave Conference Proceedings

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A new method to reduce frequency-temperature coefficient of sapphire-loaded cavities for compact hydrogen masers

Yang

Zhou

Chen

et al. 2010

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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To reduce the size and weight of the hydrogen maser atomic clocks, some useful attempts and related research results about sapphire-loaded cylindrical cavities for hydrogen masers were reported by the Beijing Institute of Radio Metrology and Measurement. The fractional frequency stability of the order of 10(¿15) over 10,000 seconds can be realized. However, because of a large frequency-temperature coefficient in a single sapphire bulb in the cavity, further improvement of the stability in the compact hydrogen clock was restricted. In this work, we chose several small single-crystal chips of SrTiO3 with a large negative frequency-temperature coefficient to compensate the sapphire microwave cavity. Based on the theoretical calculation, the frequency-temperature coefficient in the TE011 mode of a sapphire cavity associated with several small chips of SrTiO3 can be greatly reduced. A sapphire-loaded cavity and 8 compensated chips of SrTiO3 were prepared, and a combined cavity was simulated by finite element method and measured by experiments. When quality factor was kept above 40,000, the frequency-temperature coefficient can be reduced to about 1/5 of its starting value. The experimental results agree very well with the calculation and simulation. Furthermore, this new method was applied in the compact hydrogen maser. Because of the decrease of temperature frequency shift, the hydrogen maser stability at medium- and long- term averaging time from 1 s to 10(5) s has an obvious improvement compared with the our previous results.

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Frequency -temperature analysis of sapphire ring dielectric-loaded cylindrical cavity in hydrogen maser atomic frequency standard

Cited by 3 publications

References 9 publications

Frequency–temperature compensated sapphire loaded cavity for compact hydrogen masers

Frequency–temperature compensated sapphire loaded cavity for compact hydrogen masers

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

A new method to reduce frequency-temperature coefficient of sapphire-loaded cavities for compact hydrogen masers

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