任意槽形螺旋槽慢波结构的色散方程

在本文的分析中，将任意槽形的螺旋槽的连续轮廓近似用一系列相连的矩形阶梯代替，利用各阶梯面上导纳的匹配，以及槽与中心互作用区边界场的连续和匹配条件，获得了任意形状螺旋槽慢波结构的色散方程；同时加工制作了一半圆形螺旋槽模型，对其色散特性的冷测实验表明理论与测量值相吻合。

The Unified Dispersion Equation of the Arbitrarily-Shaped Helical Corrugated Slow-Wave Structure

The helical groove slow wave structure (SWS) is a new type of RF system of milli meter traveling wave tube (TWT).However,it has narrow passband.For the purpose o f broadening this circuit,it is necessary to study the influence of groove shape on the characteristics.In this paper,the dispersion equation of a helical arbit rary-shaped groove slow wave structure is derived by means of an approximate fi eld-theory analysis,in which the continuous profile of the groove is approximat ely replaced by a serious of steps,and the field continuity at the interface of two neighboring steps and the matching conditions at the interface between the g roove region and central region are ensured.The cold test on dispersion characte ristics of a half-circular helical groove structure shows that the theoretical results are in good agreement with the experimental results.