纵向金属导体加载螺旋慢波特性的理论研究
Theory research of the longitudinal metal-loaded helical slow-wave RF characteristics
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摘要: 考虑角向均匀谐波与非翼片区角向高次谐波的影响，运用场匹配法参考脊加载环板慢波结构的边界条件，推导得到翼片加载螺旋慢波结构的色散特性方程，在此基础上推导得到有限翼片加载下的耦合阻抗和衰减常数。运用MAFIA软件对该结构进行模拟计算，将理论结果与模拟计算和部分实验数据进行比较，其曲线趋势基本一致，反映了该结构的物理本质，本方法为各种类型的翼片加载螺旋慢波特性的计算提供了一种参考手段。Abstract: Considering azimuthal symmetrical harmonics and higher order harmonics in non-vane area, using field matching method and boundary condition of the ridge-loaded ring-plane slow wave structure, the dispersion equation of vane-loaded helical slow-wave structure is obtained, and coupling impedance and attenuation constant is deduced on the basis of the dispersion equation. The numerical simulation by MAFIA is compared with the theoretical calculation and experiment. They have consistent curve trend, which may explain the physics essence of the slow wave structure. The effect of the dispersion is discussed for different vane angles. The method provides a means for other types of vane-load helical slow-wave structures.
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