相速渐变折叠波导的研究

Novel Types of Phase-Velocity Tapered Folded Waveguide for Traveling-Wave Tube Amplifier

为了提高折叠波导行波管的注-波互作用效率,本文提出了两类变形的折叠波导高频结构,分别是直波导长度渐变的折叠波导以及部分加载介质的折叠波导。前者又分为连续渐变和阶梯渐变两种结构,后者有两段式及三段式介质加载两种;并从理论上分析了这两类结构。分别用等效电路法和矩形波导法分析计算了两种新型的折叠波导结构的相速,得出两者的波在轴向上的相速都降低了。再利用仿真软件进一步观察电子的运动情况和输出功率的情况,并对两种结构的参数进行了优化,优化结果可使输出功率提高达80%。仿真结果表明两种新型的结构都让更多的电子速度变慢,由此可以证明两种高频结构对注-波互作用效率有很大提高,也对输出功率有很大改善。

Two novel types of phase-velocity tapered,folded waveguide were developed to significantly improve the beam-wave interaction efficiency of folded waveguide traveling-wave tube（ TWT） amplifier： one is loading with dielectrics in two and / or threesteps; and the other is changing the straight waveguide‘s length in a step-tapered and /or consecutive tapered modes. The characteristics of the novel types of folded waveguide,including but not limited to the phase velocity,electron motion,output-power and beam-wave interaction efficiency,were mathematically modeled with equivalent circuits,theoretically analyzed and numerically simulated for design optimization. The design optimization increases the output-power by nearly 80%. The simulated results show that both types of the novel waveguide slow down the velocity of more electrons,indicating a significant improvement of the beam-wave interaction efficiency.