休斯型耦合腔电磁色散特性研究  

Study of Electromagnetic Dispersion Characteristic for Hughs Coupled Cavity

作　　者：傅德月 张松[2] 彭晓东[3] 

机构地区：[1]四川邮电职业技术学院,四川成都610067 [2]四川师范大学计算机科学学院,四川成都610066 [3]核工业西南物理研究院,四川成都610041

出　　处：《四川师范大学学报（自然科学版）》2010年第4期509-515,共7页Journal of Sichuan Normal University（Natural Science）

基　　金：国家自然科学基金(10775043)资助项目

摘　　要：微波电子器件中填充等离子体是提高其输出功率和效率增加工作带宽的有效途径之一.利用电磁场分析理论模型,研究了行波管耦合腔高频慢波结构的色散特性,建立了填充等离子体耦合腔高频慢波结构的色散分析模型.研究表明,填充等离子体后高频慢波结构的色散行为发生了重大变化.首先是当电磁波频率高于等离子体频率时,色散频谱有一个微小的上移;其次是当电磁波频率低于等离子体频率时,发现了一种新的电磁波模式——混合模.工作在混合模的行波管具有更宽的带宽,可达到未填充等离子体时的带宽的一倍以上.混合模是体积模,电场在电子通道的对称轴附近最强,更有利于电子与微波之间能量的有效交换,易于实现大功率微波电子器件.Filling plasmas in a microwave device is an approach to raise output power and efficiency and increase working band- width. The dispersion characteristic for the high-frequency slow wave structure of a traveling wave tube（TWT） with coupled cavities is investigated on the basis of the field analysis model, and the dispersion model for TWT filled with plasmas is also built. The results show that the dispersion characteristic changes a lot after TWT is filled with plasmas. When the frequency of electromagnetic wave is higher than that of plasma, there is a small upward shift in the dispersion spectrum. But when the frequency of electromagnetic wave is lower than that of plasma, a new electromagnetic mode is found, which may be called the mixed mode with much wider bandwidth. The bandwidth of TWT can be one time more than that of TWT without plasmas. The mixed mode is a volume mode. And the electric field concentrates on the neighborhood of the symmetry axis of TWT. So the mixed mode benefits the energy exchange between electron beams and electromagnetic waves. Which can bring about realization of microwave devices with high power.

关 键 词：耦合腔 等离子体 电磁波 色散关系 

分 类 号：TN102[电子电信—物理电子学] TN124.2