Investigation of W-band Diverse-shapedGroove-loaded Folded Waveguide Traveling-wave Tubes
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摘要: 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。Abstract: 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.
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