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中文摘要：
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.
英文摘要：
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.
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