毫米波螺旋线行波管慢波系统高频损耗  

RF Loss in Millimeter-wave Helical Slow Wave Structure

作　　者：郝保良[1] 黄明光[1] 刘濮鲲[1] 肖刘[1] 刘韦[1] 

机构地区：[1]中国科学院电子学研究所,北京100190

出　　处：《微波学报》2010年第S1期445-447,共3页Journal of Microwaves

基　　金：国家自然科学基金(60931001;60801030)

摘　　要：基于夹持杆分层螺旋带模型和三维电磁场分析研究了毫米波螺旋线行波管慢波系统的导体和介质损耗。螺旋带模型中介质损耗考虑为纵向传播常数的虚部,给出螺旋带中电磁场的解析解,导体损耗由螺旋线和管壳表面的面电流不连续性获得。三维电磁场分析通过本征模法,求解单周期结构的品质因数和周期储能获得有限导电率导体和夹持杆陶瓷损耗角带来的慢波系统高频损耗。结果表明,毫米波段螺旋线的导体损耗和夹持杆的介质损耗远大于管壳导体损耗,介质损耗与陶瓷损耗角呈线性关系,对高频损耗的影响不可忽略。Conductivity and dielectric attenuation in millimeter-wave helical slow-wave structure(SWS)have been analyzed by a stratified dielectric helix tape and a 3D electromagnetic model.In tape model,the imaginary part of complex propagation constant was considered as dielectric attenuation,and the conductivity losses were obtained by discontinuous surface current on metal helix and envelope.For 3D electromagnetic model,the RF losses of SWS were deduced through a quality factor and stored energy in a periodic structure with finite conductivity of helix and envelop and loss tangent of supported rods.An analysis of a Ka helical SWS shows that the conductivity loss of helix and dielectric attenuation of supported rods are greater than conductivity loss of envelope,the dielectric attenuation is linear with ceramic loss tangent and can not be neglected in millimeter wave band.

关 键 词：毫米波 导体损耗 介质损耗 螺旋线行波管 

分 类 号：TN124[电子电信—物理电子学]