毫米波准光高阶模式激励器的研究与设计  

Investigation and Design of Millimeter-Wave Quasi-Optical High-Order Mode Generator

作　　者：沈文渊[1,2] 王虎[1,2] 耿志辉[1] 王斌[3] 杜朝海[4] 刘濮鲲[4] 

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]重庆邮电大学光电工程学院,重庆400065 [4]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11期1234-1241,共8页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金项目(61072026;61072024;61102026)

摘　　要：基于毫米波准光模式传输和变换理论,详细研究了准光模式激励器通过波纹喇叭天线、准抛物柱面反射器和同轴开放式谐振腔激励圆极化高阶目标模式的原理。分析了W波段波纹喇叭天线产生准高斯模式HE11的过程;利用几何射线法研究了准抛物反射面天线作为腔体辐射馈源的设计方法;通过小孔耦合理论研究了侧壁开孔的三段式同轴谐振腔激励高阶模式的机理。同时,该文还优化设计了工作模式为TE62模,工作中心频率为94.8 GHz的准光模式激励器,使用三维电磁仿真软件FEKO仿真计算结果表明该模式激励器在94~96 GHz频率范围内目标模式的纯度超过95%,系统效率达到34%。We theoretically addressed the millimeter-wave quasi-optical high-order mode generator,which excites a high-order circular polarization mode by means of its corrugated horn antenna,quasi-parabolic mirror,and open coaxial resonator,based on transmission and transformation theories of the millimeter wave quasi-optical mode. The excitation of quasi-Gaussian HE11 mode with the W-band corrugated horn antenna was analyzed,the design of the quasi-parabolic mirror,as the feed of the open coaxial resonator,was discussed in geometric ray method,and the mechanism responsible for the high-order mode excitation via a three-stage coaxial resonator with an array of holes on its sidewall was investigated in hole-coupling scheme. In addition,the quasi-optical high-order mode generator,operating in TE62 mode at a center frequency of 94. 8 GHz,was designed and simulated with 3-D simulation software FEKO. The simulated results show that the TE62-mode purity is higher than 95% at 94 ~ 96 GHz,and the efficiency is over 34%.

关 键 词：回旋管 准光模式激励器 波纹喇叭 同轴谐振腔 

分 类 号：TN81[电子电信—信息与通信工程]