An ultra-small atomic frequency standard microwave cavity based on parallel plate waveguide

Abstract

The invention discloses an ultra-small atomic frequency standard microwave cavity based on a parallel plate waveguide. A rectangular counterbore is opened at one end of the cavity as a cavity in the cavity. An atomic gas chamber is arranged in the cavity, and a wire groove is arranged on the outer wall of the cavity. The C field coil is wound in the line groove, the first parallel plate and the second parallel plate are symmetrically fixed on the side walls of the two inner sides opposite to the cavity, and the side walls of the cavity are provided with probe mounting holes for coupling probes The needle protrudes into the cavity, close to but not touching the strip metal sheet of the second parallel plate. The invention has low processing difficulty and is easy to control precision to ensure consistency. There are two microwave field modes with high parallelism and non-degenerate microwave magnetic field polarization direction, one is TEM mode, in which the microwave magnetic field polarization direction is perpendicular to the optical axis, and the other is TE mode, in which the microwave magnetic field The polarization direction is parallel to the optical axis. The quantization axis can be perpendicular or parallel to the optical axis, which increases the flexibility of the structure design of the microwave cavity.

Description

technical field [0001] The present invention relates to the technical field of atomic frequency standards, and more specifically relates to an ultra-small atomic frequency standard microwave cavity based on a parallel plate waveguide. The microwave cavity has a simple structure and flexible size, and has two microwave field modes for exciting atomic clock transitions , suitable for ultra-small rubidium atomic frequency standard. Background technique [0002] Precise time is the cornerstone of digital communication, and highly accurate time is the basis for increasing the bandwidth and speed of digital communication. With the rapid development of the communication industry, modern digital communication systems need more accurate and stable and reliable timing devices. The atomic frequency standard is a timing device based on the precise and stable transition frequency between atomic energy levels. The rapid development of atomic frequency standard related technologies has ma...

AI Technical Summary

Problems solved by technology

A typical rectangular cavity is described by the document H.E.Williams, Compact Rectangular Cavity for Rubidium Vapor Cell Frequency Standards.37thAnnual Symposium on Frequency Control (1983), which uses TE 101 The standard rectangular cavity structure of the mode is filled with a dielectric plate of a certain thickness in the direction parallel to the Z axis. This structure is small in size, but the parallelism between the polarization direction of the microwave magnetic field and the quantization axis is limited, and it cannot make full use of atoms to generate frequency discrimination signals.

The coaxial TEM cavity is described by J. Deng, ultra-small microwave cavity, CN1452798A, 2003. This cavity is a lumped L-C structure formed by a conductive rod extending into the cavity and a gap between the rod and the cavity wall to generate resonance. , the resonant frequency is mainly determined by the geometric size of the conductive rod and its distance to the cavity wall, basically not limited by the size and shape of the cavity, suitable for ultra-small rubidium atomic frequency standards, but the polarization direction of the microwave magnetic field is parallel when the cavity is working The degree is not high, which is not conducive to exciting atoms to generate clock transition signals

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