摘要
蓝宝石谐振体内的电磁场为回音壁模式时具有极低的介质损耗.本文采用径向-轴向模式匹配法,理论分析了蓝宝石谐振体内的场模式分布,分析了谐振频率与谐振体几何尺寸的关系;其次,基于有限元分析仿真了蓝宝石圆柱体内场分布情况;研制了三维转动位移台,采用磁环/探针耦合的方式激发蓝宝石谐振体内的回音壁电磁场,测量了谐振体表面的S参数,由此确定了谐振体内的回音壁模式参数,得到谐振器的无载Q值为94000.利用该谐振体可制成低相位噪声的微波振荡器.
When the electromagnetic field in the sapphire resonator corresponds to the whispering gallery mode,it exhibits an extremely low dielectric loss.As result,sapphire oscillator has the characteristics of ultra-low phase noise and high short-term frequency stability.The distribution of electromagnetic field in the sapphire resonator is very important for realizing high-level oscillator.In this work,the radial-axial mode matching method is used to theoretically analyze the distribution of the field mode in the sapphire resonator,and the resonant frequency of the WGHm,0,0 mode is calculated.The field distribution of the sapphire resonator is simulated by the finite element analysis method.The gallery mode number of the sapphire resonator is studied and the electromagnetic field intensity distribution of the WGH15,0,0 mode in the azimuthal,axial and radial direction are obtained.Finally,a home-made gallery mode analyzer is used to measure the microwave field on the surface of sapphire resonator,which is composed of a three-dimensional rotating stage,the magnetic ring/probe coupling and a vector network analyzer.With the above theoretical analysis,the finite element analysis method and the experimental measurement,the working mode of the sapphire resonator and the resonant frequency of the WGHm,0,0 mode are determined.When the sapphire resonator works in WGH15,0,0 mode,the resonant frequency is 9.891 GHz,and the parameters of the whispering gallery mode in the resonator are obtained,and the unloaded Q value of the resonator is 94000.When the temperature is 292 K,the frequency-temperature sensitivity of the sapphire resonator working in the WGHm,0,0 whispering gallery mode is about 71.64×10−6.The microwave oscillator consisting of the high Q sapphire resonator can be used to make an oscillator with ultra-low phase noise and high frequency stability.
作者
范思晨
杨帆
阮军
Fan Si-Chen;Yang Fan;Ruan Jun(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Time and Frequency Primary Standards,Chinese Academy of Sciences,Xi’an 710600,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第23期237-244,共8页
Acta Physica Sinica
基金
中国科学院西部青年学者项目(批准号:XAB2018 A06)
中国科学院重大科技基础设施维修改造项目(批准号:DSS-WXGZ-2020-0005)资助的课题
关键词
蓝宝石谐振体
回音壁模式
相位噪声
品质因数
sapphire resonator
whispering gallery mode
phase noise
quality factor
作者简介
通信作者:阮军,ruanjun@ntsc.ac.cn。
