小型铯原子钟微波腔调谐过程的仿真研究

Simulation of Tuning Procedure for Microwave Cavity in the Compact Cesium Atom Clock

通过建立模型,利用Ansoft HFSS 12.0对小型铯原子钟内微波腔的调谐过程进行了仿真,得到了调谐棒半径、在调配器内长度与微波腔谐振频率之间的关系曲线。结果表明,调谐棒半径一定时,调谐棒长度在一定范围内,微波腔谐振频率随着长度的增加逐渐下降;随着半径的增大,微波腔谐振频率的变化范围逐渐增大,在铯原子跃迁中心频率处,调谐棒长度对微波腔谐振频率的影响变大。根据仿真结果,给出了调谐棒半径的取值范围,为微波腔的设计、加工和调谐提供了理论指导。

By building the microwave cavity model,the tuning procedure for microwave cavity in the compact cesium atom clock was simulated by using Ansoft HFSS 12.0.There was the curve relationship between cavity resonance frequency and the length in the tuner microwave of the rod tuner.The result shows that,with increasing the length of rod tuner in the tuner microwave,the cavity resonance frequency is decreased,when the radius of rod tuner is a constant,and the length of rod tuner is changed within a certain range.With increasing the radius of rod tuner,the range of cavity resonance frequency is increasing,meanwhile the influence of length on the cavity resonance frequency is increasing at the transition frequency of cesium atom.We suggest the optimal radius of rod tuner on the basis of the result in order to provide the basis for the structure and principle analysis of cavity in compact cesium atom clock and theoretical guidance for the cavity design and manufacture.