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本文基于一种阶梯槽交错双栅周期慢波结构模型,获得了该结构中的电磁场分布公式.通过场匹配方法,求出了该结构的高频色散方程和耦合阻抗表达式.以W波段行波管用的阶梯槽交错双栅为例,利用本文公式和CST-MWS电磁软件比较计算了色散和耦合阻抗特性,分析了阶梯尺寸参数对高频特性(基模色散、+1次空间谐波归一化相速和耦合阻抗)的影响.结果表明,理论和CST-MWS软件模拟有很好的一致性;相对矩形交错双栅,改善了色散特性,拓展了基模带宽,同时具有足够大的耦合阻抗和适合工程应用的机械强度,在一定程度上可以弥补矩形交错双栅周期慢波结构的不足.
In this paper, based on a stepped staggered double-grating periodic slow-wave structure model, the electromagnetic field distribution formula of the structure is obtained.The high-frequency dispersion equation and the coupling impedance expression of the structure are obtained by the field matching method.The W- For example, the staggered double-gate with corrugated trench in wave tube is taken as an example. The dispersion and coupling impedance characteristics are calculated by using the formula in this paper and CST-MWS electromagnetic software. The effect of step size on high frequency characteristics (fundamental dispersion, The results show that the theory and CST-MWS software simulation has a good agreement; relative rectangular staggered double-gate, improved dispersion characteristics, expanding the bandwidth of the fundamental mode, while having a large enough The coupling impedance and the mechanical strength suitable for engineering applications can make up for the deficiencies of the rectangular staggered double-grid periodic slow-wave structure to a certain extent.