Designs of a miniaturized sapphire-loaded cavity for spaceborne hydrogen masers
The previous compact hydrogen maser with sapphire microwave cavity at the Beijing Institute of Radio Metrology and Measurement was not suitable for a space application in navigation systems with limitations on volume and weight. To resolve this problem, we present a new design of the sapphire-loaded...
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| Veröffentlicht in: | IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2010-03, Vol.57 (3), p.587-591 |
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| container_title | IEEE transactions on ultrasonics, ferroelectrics, and frequency control |
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| creator | Yang, Ren-fu Zhou, Tie-zhong Wang, Nuan-rang Gao, Lian-shan |
| description | The previous compact hydrogen maser with sapphire microwave cavity at the Beijing Institute of Radio Metrology and Measurement was not suitable for a space application in navigation systems with limitations on volume and weight. To resolve this problem, we present a new design of the sapphire-loaded cavity with optimal parameters in the minimization of volume and maximization of the quality factor. Methods of theoretical calculations, finite element simulation, and related experiments were performed in designing the sapphire-loaded cavity. Based on the analysis, a miniaturized sapphire microwave cavity with the total volume of 3.04 dm 3 , the quality factor 67 500, and frequency-temperature coefficient -59.7 kHz/°C is developed. The experimental results are completely consistent with calculation values. In addition, the theoretical calculation result shows that the product of the z-component of the magnetic energy filling factor in the bulb region and the cavity TE 011 -mode Q-factor is 40 800 at 50°C in the miniaturized sapphire cavity. In addition, 2 sapphire-loaded cavities in the Japanese National Institute of Information and Communications Technology and in the Microwave and Optical Communication Research Institute at the University of Limoges, France, are compared with that of our designs. |
| doi_str_mv | 10.1109/TUFFC.2010.1451 |
| format | Article |
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To resolve this problem, we present a new design of the sapphire-loaded cavity with optimal parameters in the minimization of volume and maximization of the quality factor. Methods of theoretical calculations, finite element simulation, and related experiments were performed in designing the sapphire-loaded cavity. Based on the analysis, a miniaturized sapphire microwave cavity with the total volume of 3.04 dm 3 , the quality factor 67 500, and frequency-temperature coefficient -59.7 kHz/°C is developed. The experimental results are completely consistent with calculation values. In addition, the theoretical calculation result shows that the product of the z-component of the magnetic energy filling factor in the bulb region and the cavity TE 011 -mode Q-factor is 40 800 at 50°C in the miniaturized sapphire cavity. In addition, 2 sapphire-loaded cavities in the Japanese National Institute of Information and Communications Technology and in the Microwave and Optical Communication Research Institute at the University of Limoges, France, are compared with that of our designs.</description><identifier>ISSN: 0885-3010</identifier><identifier>EISSN: 1525-8955</identifier><identifier>DOI: 10.1109/TUFFC.2010.1451</identifier><identifier>PMID: 20211774</identifier><identifier>CODEN: ITUCER</identifier><language>eng</language><publisher>New York, NY: IEEE</publisher><subject>Design engineering ; Exact sciences and technology ; Extraterrestrial measurements ; Finite element methods ; Frequency ; Holes ; Hydrogen ; Hydrogen masers ; Masers ; Mathematical analysis ; Measurements common to several branches of physics and astronomy ; Metrology ; Metrology, measurements and laboratory procedures ; Microwave measurements ; Microwaves ; Physics ; Q factor ; Quality factor ; Radio navigation ; Sapphire ; Space applications ; Time and frequency ; Volume measurement</subject><ispartof>IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 2010-03, Vol.57 (3), p.587-591</ispartof><rights>2015 INIST-CNRS</rights><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. 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To resolve this problem, we present a new design of the sapphire-loaded cavity with optimal parameters in the minimization of volume and maximization of the quality factor. Methods of theoretical calculations, finite element simulation, and related experiments were performed in designing the sapphire-loaded cavity. Based on the analysis, a miniaturized sapphire microwave cavity with the total volume of 3.04 dm 3 , the quality factor 67 500, and frequency-temperature coefficient -59.7 kHz/°C is developed. The experimental results are completely consistent with calculation values. In addition, the theoretical calculation result shows that the product of the z-component of the magnetic energy filling factor in the bulb region and the cavity TE 011 -mode Q-factor is 40 800 at 50°C in the miniaturized sapphire cavity. 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To resolve this problem, we present a new design of the sapphire-loaded cavity with optimal parameters in the minimization of volume and maximization of the quality factor. Methods of theoretical calculations, finite element simulation, and related experiments were performed in designing the sapphire-loaded cavity. Based on the analysis, a miniaturized sapphire microwave cavity with the total volume of 3.04 dm 3 , the quality factor 67 500, and frequency-temperature coefficient -59.7 kHz/°C is developed. The experimental results are completely consistent with calculation values. In addition, the theoretical calculation result shows that the product of the z-component of the magnetic energy filling factor in the bulb region and the cavity TE 011 -mode Q-factor is 40 800 at 50°C in the miniaturized sapphire cavity. 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| subjects | Design engineering Exact sciences and technology Extraterrestrial measurements Finite element methods Frequency Holes Hydrogen Hydrogen masers Masers Mathematical analysis Measurements common to several branches of physics and astronomy Metrology Metrology, measurements and laboratory procedures Microwave measurements Microwaves Physics Q factor Quality factor Radio navigation Sapphire Space applications Time and frequency Volume measurement |
| title | Designs of a miniaturized sapphire-loaded cavity for spaceborne hydrogen masers |
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