W波段多种槽加载折叠波导行波管的研究

该文提出了3种槽加载折叠波导行波管慢波结构:三角形、梯形和燕尾形槽加载折叠波导。分析比较了不同槽形状对慢波结构的色散特性和耦合阻抗的影响。利用粒子模拟的方法对W波段4种槽加载折叠波导行波管的非线性注-波互作用进行了研究;在相同的电子注参数和输入功率的条件下,对输出功率、电子效率和增益等参量进行了比较。在多种槽加载结构中,梯形槽加载折叠波导输出功率(255 W)和增益(37.1 dB)最大,电子效率最高(10.7%);燕尾形槽加载折叠波导达到饱和所需要的互作用电路最短(64.2 mm);三角形槽加载折叠波导的3 dB带宽最宽。

Investigation of W-band Diverse-shaped Groove-loaded Folded Waveguide Traveling-wave Tubes

Three novel groove-loaded Folded Waveguide Slow-Wave Structures(FWSWS),which include triangle groove-loaded,trapezoid groove-loaded and swallow-tailed groove-loaded FWSWS,are analyzed for the purpose of improving beam-wave interaction.The high-frequency characteristics,including dispersion properties and interaction impedance,are investigated by numerical simulation,and the nonlinear large-signal performances of these Traveling Wave Tubes(TWTs),including output power,gain and electron efficiency,are also analyzed and compared by a 3-D particle-in-cell code MAGIC3D.Within the same beam parameters and input power,it is concluded from the comparison that: among these FWSWSs,the trapezoid groove-loaded FWSWS has the highest output power(255 W),saturated gain(37.1 dB),and electron efficiency(10.7%);The swallow-tailed groove-loaded FWSWS owns the shortest circuit length to obtain the saturated gain of which is 64.2 mm;the triangle groove-loaded FWSWS has the widest bandwidth.