阶梯槽交错双栅慢波结构高频特性理论和模拟

发布时间：2018-03-21 15:26

本文选题：场匹配法　切入点：阶梯槽　出处：《物理学报》2014年01期 　论文类型：期刊论文

【摘要】：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.
[Abstract]:Based on a staggered two-gate periodic slow-wave structure model with stepped grooves, the electromagnetic field distribution formula of the structure is obtained in this paper. The high frequency dispersion equation and the coupling impedance expression of the structure are obtained. Taking the staggered double gate of the W band traveling wave tube as an example, the dispersion and coupling impedance characteristics are calculated by comparing the formula with the CST-MWS electromagnetic software. The influence of step dimension parameters on the characteristics of high frequency (fundamental mode dispersion, normalized phase velocity and coupling impedance of first order spatial harmonics) is analyzed. The results show that the theory is in good agreement with the simulation of CST-MWS software, compared with the rectangular staggered double gate, The dispersion characteristic is improved, the fundamental mode bandwidth is expanded, and the coupling impedance is large enough and the mechanical strength suitable for engineering application can be improved. To some extent, the deficiency of rectangular staggered double-gate periodic slow-wave structure can be remedied.
【作者单位】：中国科学院电子学研究所;中国科学院大学;
【基金】：国家自然科学基金(批准号:61172016)资助的课题~~
【分类号】：O441.4

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