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公开(公告)号：EP0173545A3
公开(公告)日：1986-09-10
申请号：EP85305945
申请日：1985-08-21
发明人： Blair, David Gerald
摘要： This invention describes a crystalline alumina loaded cavity resonator which has low loss and high frequency stability such that its frequency is well-defined and only weakly perturbed by temperature, pressure and mechanical changes in its environment. Basically the resonator is a single crystal of sapphire (1) having protusions (2) and (2') fitting closely into recesses in the base (3) and lid (3') of a niobium housing. The lid (3') is clamped by groove (4) and having a indium seal to seal the lid (3') to the side walls (5) at groove (6) in lid (3'). A microwave probe (7) is used to couple microwave power into the cavity through hole (8).
摘要翻译： 本发明描述了一种具有低损耗和高频率稳定性的结晶氧化铝负载腔谐振器，使得其频率被明确定义，并且仅受其环境温度，压力和机械变化的微弱扰动。 基本上，谐振器是具有突起（2）和（2分钟）的蓝宝石（1）的单晶，其紧密地配合到铌壳体的基部（3）和盖子（3分钟）中的凹部中。 盖子（3分钟）用凹槽（4）夹紧并具有铟密封，以在盖子（3分钟）内的凹槽（6）将盖子（3分钟）密封到侧壁（5）。 微波探头（7）用于将微波功率耦合到空腔通孔（8）中。
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公开(公告)号：EP0211455A3
公开(公告)日：1988-08-17
申请号：EP86201142
申请日：1986-06-30
发明人： Giavarini, Andrea
IPC分类号： H01P07/06
CPC分类号： H01P7/06
摘要： It is described a microwave metallic cavity, the resonating frequency of which is stabilized versus operating temperature variations. The said stabilization is achieved by implementing the cavity with a conical base (3) having a thickness and a coefficient of linear expansion smaller than the ones of the cavity cylidrical body (1). In this way the volume enclosed by the conical base (3) varies in inverse ratio versus operating temperature variations, so as to compensate the variation in volume of the cavity cylindrical body (1), which results in a stabilization of the resonating frequency.
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公开(公告)号：EP0125450A3
公开(公告)日：1985-11-13
申请号：EP84103597
申请日：1984-03-31
摘要： In a microwave device, particularly a microwave local oscillator, frequency variations due to temperature changes are reduced by supporting the tuning element, for example a quartz or sapphire crystal (34), in the end of a tube (18) of INVAR or other material having a low thermal coefficient of expansion. The tube projects into the cavity (12) from a hole in one wall thereof. Preferably the tube is positively located relative to the cavity by means of an external lip (20) on the tube abutting a shoulder (22) formed by a reduced diameter part of the hole adjacent the cavity. The lip (20) may be urged into positive contact with the shoulder (22) by a spring washer (24) acting between the end of the tube and the opposed end of a bush (26) screwed into the hole.
摘要翻译： 在微波器件中，特别是微波本地振荡器中，通过在INVAR的管（18）或其他材料的端部中支撑调谐元件，例如石英或蓝宝石晶体（34），降低了由于温度变化引起的频率变化 具有低的热膨胀系数。 该管从其一个壁中的孔伸入空腔（12）中。 优选地，借助于管上的外部唇缘（20），所述管相对于空腔可靠地定位，所述外部唇缘（20）邻接由邻近空腔的孔的直径减小部分形成的肩部（22）。 通过作用在管的端部和旋入孔中的衬套（26）的相对端部之间的弹簧垫圈（24），可促使唇部（20）与肩部（22）形成强制接触。
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公开(公告)号：EP0246639A3
公开(公告)日：1988-07-27
申请号：EP87107359
申请日：1987-05-20
申请人： BALL CORPORATION
发明人： Stein, Samuel R.
CPC分类号： H01S1/06
摘要： An atomic resonance apparatus of the subject invention comprises means forming a cavity (11) for containing an ensemble of atomic species in a gaseous state at a reduced pressure, said cavity forming means being defined by a container having outer and inner surfaces formed of a dielectric material and comprising the major portion of said container, said inner surface of said container defining a cavity resonator, said cavity resonator having an aperture (15) for axial radial communication from the outer to the inner portions of said container for the introduction and withdrawal of atomic species therefrom, said cavity having a thin coating (20) on its inner surface of an energy state minimizing composition to substantially reduce the interaction of said atomic species with said surface, said container having on its outer surface a thin outer conductive layer of a predetermined configuration, means proximate the end walls of said container for excluding atomic species therefrom, means providing a low intensity magnetic field for quantizing said ensemble of atomic species, means forming a resonant circuit electromagnetically coupled to the ensemble of atomic species and tuned to substantially the natural atomic hyperfine resonant frequency of the atomic species for receiving electromagnetic wave energy therefrom of an exceedingly stable frequency and spectral purity.
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公开(公告)号：EP0248276A3
公开(公告)日：1988-07-20
申请号：EP87107357
申请日：1987-05-20
申请人： BALL CORPORATION
摘要： The invention provides a frequency standard, comprising:
frequency-generating means (100) for generating electromagnetic energy at variable frequencies;
a hydrogen maser (10) including means (12,13,19) to direct a stream of hydrogen atoms at a hyperfine energy state into a microwave cavity assembly (52) to generate electromagnetic energy at hydrogen resonance frequency; and
an electronic means (120) to control the frequency of said frequency-generating means (100) to maintain a standard frequency with the electromagnetic energy generated by said hydrogen maser (10),
said microwave cavity assembly (52) including a dielectric container defining by its outer surfaces a microwave cavity that is tuned to about hydrogen resonance frequency and including a discontinuous conductive coating on its outer surface in a predetermined configuration to suppress undesired oscillation of the microwave cavity.
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