0.22THz宽带折叠波导行波管设计与实验

为了获得0.22THz宽带折叠波导行波管,对行波管的慢波结构和输入输出窗结构进行了宽带设计。通过理论分析和电磁仿真计算出合适的参数,使慢波结构在0.22THz工作点附近的色散曲线平坦,耦合阻抗变化小,模拟计算得到的慢波结构3dB带宽大于16GHz;通过对盒型窗结构及匹配段的优化计算,得到的输入输出结构在大于30GHz范围内S11参数小于-25dB。根据该设计进行了两轮制管和实验研究,得到了一支3dB瞬时带宽约8.8GHz,另一支3dB瞬时带宽大于12GHz的0.22THz折叠波导行波管,中心频率的峰值功率大于400mW。

Design and test of wideband 0.22 THz folded-waveguide travelling wave tube

In order to develop a wideband 0.22 THz folded-waveguide travelling wave tube, a slow wave structure and RF window are carefully designed. By theoretic analysis and simulation, the tube will work at the point where the dispersion curve is flat and instantaneous bandwidth is more than 16 GHz. In more than 30 GHz, S11 of the RF window is better than -25 dB. The experimental result of the first prototype tube shows that the instantaneous bandwidth is only about 8 GHz. After optimization, the instantaneous bandwidth of the second prototype tube becomes more than 12 GHz with an output peak power more than 400 mW.