周期结构电磁特性在高频真空器件中的应用

Application of dispersion characteristics of periodic structures for high frequency vacuum devices

作为行波类真空电子器件的核心组件,慢波结构是一种周期结构,其场可以有无限多个模式,每个模式由无穷多个空间谐波构成.每个空间谐波有相应的色散曲线且曲线各段有不同的特性.提出了周期结构色散特性的全维度开发的概念,并以一种可用微电机系统(MEMS)技术加工的折叠波导(FWG)慢波结构为例,对其色散特性进行了分析,利用这些色散特性开展了行波管(TWT)、返波管(BWO)等传统器件的研究工作,同时提出了过模器件、带边振荡器(BO)和谐波放大器(THAT)等新型器件,这些器件的实验研究则以W波段及其以上频率为主,最后给出了突破的关键技术以及测试得到的器件的主要性能.

As the key component of vacuum electron device （VED）, slow wave structure is a kind of periodic structure, whose dispersion properties can be presented as the sum of an infinite number of space har- monic wave. Each space harmonic wave exits as a dispersion curve with its characteristic. We proposed the idea of the full use of dispersion properties of periodic structures for high frequency vacuum power devices, and carried out the research on folded waveguide （FWG） slow wave structure, which was comparable with MEMS technology. The dispersion curve was analyzed, and was used for different kind of traditional devices including travelling wave tubes （TWTs）, backward wave oscillator （BWO） and band-edge oscillators （BO）. In addition, over-mode TWTs and TWT harmonic amplifier in THz （THAT） were proposed as novel devices. All the experimental investigation was focused on W-band and frequencies above, and the key technologies and the specifications obtained from these devices were given.