V形曲折矩形槽慢波结构的研究

摘要

A novel slow-wave structure called V-shape folded rectangular groove waveguide is proposed.This structure evolves from a conventional rectangular groove waveguide bending the groove with V-shape along its longitudinal direction,and the gap between metal plates forms a sheet electron beam channel naturally.Compared with the traditional U-shape structure,it can increase the interaction area without changing good high-frequency properties,which can adopt the sheet electron beam with a larger area to acquire more output power.In this paper,the high-frequency properties of this structure are analyzed,the interaction circuit for the V-band TWT is designed and the PIC simulation is performed to predict the operating characteristics.From our calculations,this tube can produce average saturation output power over 1000 Watts in a frequency range from 58 GHz to 64 GHz when the cathode voltage and beam current are set to be 12.8 kV and 600 mA respectively.The corresponding saturation gain and electron efficiency can reach over 33 dB and 13.2%respectively.%提出了一种新型的慢波结构一V形曲折矩形槽慢波结构,该结构是由矩形槽波导沿其E面法向周期性呈V形折叠而成,其两金属板之间的间隙形成天然的带状电子注通道.相比传统的U形曲折矩形槽波导,它能在保持良好高频特性的情况下增加互作用面积,从而可以采用面积更大的带状电子注以获得更大的输出功率.分析了该结构的高频特性,在V波段完成了对行波管互作用电路的设计,并利用三维粒子模拟的方法估计了其工作性能.研究结果表明,当工作电压和电流分别为12.8 kV和600mA时,在58—64GHz的频率范围内饱和平均输出功率大于1000W,相应的饱和增益和电子效率分别大于33 dB和13.2%.