A New Atomic Frequency Standard Microwave Cavity

Abstract

The invention discloses a novel microwave cavity for an atomic frequency standard. The microwave cavity comprises a cylindrical cavity and a slotted tube, wherein the slotted tube comprises pole pieces, a boss and a base, which are arranged into a whole; the base is arranged at one end of the boss; the number of the pole pieces is an integer more than or equal to 2; the pole pieces are arranged at the other end of the boss; the base is fixed at one end of the cylindrical cavity via screws; the boss and the pole pieces are arranged in the cylindrical cavity; the outer wall of the boss is closely jointed with the inner wall of the cylindrical cavity; a filter cell is arranged in the boss; all the pole pieces are closely jointed on an absorption cell and are uniformly distributed around the absorption cell; a gap is reserved between the pole pieces and the inner wall of the cylindrical cavity; a heating wire is wound around the outer wall of the cylindrical cavity; a top cover is arranged at the other end of the cylindrical cavity; a photocell is arranged at the inner side of the top cover. Compared with the prior art, the microwave cavity has the advantages and effects that the microwave cavity has a simple and compact structure, is easy to assemble and debug, has high reliability, high microwave field direction factors and high Q value, is convenient in frequency trimming and can be widely applied to the high-performance rubidium atomic frequency standard.

Description

technical field [0001] The invention relates to a rubidium atomic frequency standard, and more specifically relates to a novel atomic frequency standard microwave cavity. The novel microwave cavity has the characteristics of simple structure, easy assembly and high reliability, and is suitable for making high-performance rubidium atomic frequency standard. Background technique [0002] With the development of social technology, more accurate and stable time-frequency signals are required in many fields. With the rapid development of frequency standard technology, the atomic frequency standard, as a more reliable clock frequency source, has gradually replaced the traditional mechanical clock and crystal oscillator clock, and plays an important role in the fields of time service, punctuality, navigation and positioning, and synchronous communication. . The rubidium atomic frequency standard has become one of the most widely used atomic frequency standards due to its good comp...

AI Technical Summary

Problems solved by technology

The material of the dielectric ring is usually a non-metal with a dielectric constant greater than 1. In practical applications, we have found that the structural component of the dielectric ring has the following disadvantages: 1. The dielectric constant of the medium is affected by temperature, which will change slightly, and then 2. The thermal expansion coefficient of the medium is larger than that of the metal. When the resonant cavity is in the working state of continuous heating, the medium will expand when heated, and the metal pole piece of the slotted tube that is in close contact with it will be squeezed, so that Its deformation, that is, changes the structural parameters of the slotted lumen, will also affect the cavity frequency; 3. When the rubidium clock works for a long time, the dielectric ring in the resonant cavity will age to a certain extent

These factors reduce the reliability of the rubidium clock's long-term work, and will also have a corresponding impact on the long-term stability of the rubidium clock

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