W波段TE_(6,2)模同轴开放式谐振腔的研究与设计  

Design and Characterization of TE_(6,2) Mode Open Coaxial Resonator in W-band

作　　者：沈文渊[1,2] 王虎[1,2] 耿志辉[1] 杜朝海[3] 刘濮鲲[3] 

机构地区：[1]中国科学院电子学研究所高功率微波源与技术重点实验室,北京100190 [2]中国科学院大学,北京100190 [3]北京大学信息科学技术学院,北京100871

出　　处：《真空科学与技术学报》2014年第7期749-753,共5页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金项目(61072026;61072024)资助课题

摘　　要：详细研究了一种用于回旋管冷测的三段式同轴谐振腔模式激励器,该模式激励器利用同轴开放腔的选频选模特性将输入的W波段的波功率转换为TE6,2模式输出。基于缓变截面波导理论,研究了同轴谐振腔激励TE6,2模式的机理;求解了同轴波导中TE模式的特征根和不均匀弦方程并得到腔体谐振频率及Q值;分析了同轴腔内外半径对谐振频率的影响;给出了W波段高纯度TE6,2模谐振腔优化设计的参数;并用电磁仿真软件对其进行仿真计算,结果表明:该谐振腔的TE6,2模式纯度达到99.51%。A novel type of three-stage coaxial mode resonator was developed for the cold test of gyrotron. The resonator is capable of changing the input W-band electromagnetic wave into TE6,2 mode because of its frequency and mode selectivity. The mechanism responsible for TE6,2 mode selectivity of the coaxial resonator was investigated based on the theory of slow-changing cross-section of coaxial waveguide. The eigenvalues of TE mode and resonance frequency were calculated. The Q-factor and amplitude distribution of the resonator cavity were obtained. The impact of the inner and outer radii of coaxial cavity on resonance frequency was studied. In addition, the W-band, high purity TE6,2 mode resonator was modeled, de- signed,and simulated with software package HFSS. The simulated results show that the mode purity of TE6,2 reaches 99.51%.

关 键 词：同轴波导 开放谐振腔 谐振频率 模式纯度 

分 类 号：TN81[电子电信—信息与通信工程]