In this letter, the modified flat-roofed sine waveguide slow-wave structure (FRSWG-SWS) is proposed for the wideband high-power sub-terahertz traveling-wave tube (sub-THz TWT), which possesses the advantages of wide operating bandwidth, low loss, minimal reflection, and ease of fabrication. The simulation results demonstrate that the transmission parameter is more than −5.0 dB in the frequency range between 210 and 250 GHz. The beam–wave interaction results indicate that the modified FRSWG can provide over 50 W of output power and 30 dB of gain from 205 to 250 GHz with sheet electron beam with a voltage of 20.8 kV and a current of 150 mA. Finally, we use high-speed milling to fabricate the modified FRSWG by the nano-Computer Numerical Control (CNC) technology. The cold test results demonstrate that the modified FRSWG has low loss and good reflection characteristics.

中文翻译：

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用于宽带 220 GHz TWT 的改进平顶正弦波导慢波结构的研究


本文针对宽带高功率亚太赫兹行波管（sub-THz TWT）提出了改进的平顶正弦波导慢波结构（FRSWG-SWS），该结构具有工作带宽宽的优点、低损耗、最小反射且易于制造。仿真结果表明，在210至250 GHz频率范围内，传输参数大于-5.0 dB。束波相互作用结果表明，改进的FRSWG可以在20.8 kV电压和150 mA电流的片状电子束下在205至250 GHz范围内提供超过50 W的输出功率和30 dB的增益。最后，我们利用纳米计算机数控（CNC）技术采用高速铣削制造了改进的FRSWG。冷态测试结果表明，改进的FRSWG具有低损耗和良好的反射特性。