介质加载折叠波导行波管的线性分析  

Linear analysis of the dielectric-loaded folded waveguide traveling-wave tube amplifier

作　　者：张长青[1] 宫玉彬[1] 魏彦玉[1] 王文祥[1] 

机构地区：[1]电子科技大学物理电子学院,大功率微波电真空器件技术国防重点实验室,成都610054

出　　处：《物理学报》2010年第9期6653-6658,共6页Acta Physica Sinica

基　　金：国家自然科学基金重点项目(批准号:60532010)资助的课题~~

摘　　要：提出了一种介质加载折叠波导慢波结构,给出了该结构中存在电子注时慢波互作用的热色散方程,在介电常数εr=1的特殊情况下该方程即简化为普通折叠波导的小信号工作方程.在给定慢波结构尺寸的基础上,分析比较了介质加载对放大器小信号增益特性的影响,结果表明:"弱加载"(介质厚度d/a<0.1)时,无需重新设计慢波结构的参数,只需适当调整工作电压和电流就可以满足原有设计要求,而且和未加载时相比增益特性更为平坦,降低的电子注阻抗也有利于电子效率的提高.考虑到弱加载可以有效降低导体的高频损耗,因此该研究对研制太赫兹折叠波导行波管也具有一定的指导意义.In this paper a dielectric-loaded folded waveguide slow-wave circuit is presented. The＂hot＂dispersion relation for slow wave interaction between the traveling wave and linear beam is derived from the fluid dynamical treatment. In the special case where εr = 1,the dispersion relation can be simplified with a closed form of the conventional Pierce’s small-signal equation,which confirms the validity of the derivations. By giving the specific parameters,the effects of dielectric loading on the small-signal gain have been studied. The results indicated that in the case of＂weak loading＂（where d /a 0. 1）,the gain is flattened and there is no need to readjust the structure parameters beyond a slight adjustment of beam parameters. By considering that the＂weak loading＂can reduce the ohmic loss of the conductor,this study will be also a guide to the research of the THz folded waveguide traveling-wave tube.

关 键 词：折叠波导 行波管放大器 介质加载 热色散方程 

分 类 号：TN124[电子电信—物理电子学]