脊加载螺旋槽行波管的小信号增益计算

脊加载螺旋槽行波管是一类新型毫米波大功率器件，给出了此结构中引入电子注后的“热”色散方程，并利用“牛顿”下山法求解了此复系数超越方程.通过数值计算给出了一个工作电压为20kV频率为474GHz的脊棱加载慢波结构的具体尺寸，并对此结构中小信号增益随脊尺寸的变化情况及电子注参数对其影响进行了研究，计算结果表明：此结构适宜于作为高增益窄带毫米波大功率行波管的慢波线，其3dB增益带宽为34%；为了展宽其工作带宽，可以适当减小间隙宽度，也可在一定范围内提高电子注电流.给出的理论对于研制此类行波管具有一定的指导意 关键词：

THE GAIN COMPUTATION FOR THE TRAVELING WAVE TUBE WITH RIDGE-LOADED HELICAL GROOVE

The ridge-loaded helical traveling wave tube (TWT) is a new kind of high power millimeter wave device. The “hot” dispersion equation of this circuit loaded with an electronic beam is presented in this paper, and the Downhill method is used to solve the transcendental equation. The physical dimensions of a 474GHz ridge-loaded helical groove slow wave structure (SWS) with a 20kV electron beam are given and the investigations of the effect of the ridge dimensions and electron beam parameters on the small signal gain are carried out. It is indicated from the calculation results that this type of structure is suitable for use as s SWS of high power, high gain but narrow passband millimeter TWT, of which the 3dB gain bandwidth is 34%. In order to increase the bandwidth, the reduction of the ridge gap or the increase of the electron beam current in an allowable range may be useful. The presented analysis will be a guide to the design of this kind of traveling wave tube.