Electromagnetic field’s transmission attenuation in 345 GHz folded waveguide traveling-wave tube
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摘要: 利用电导率等效方法对345 GHz折叠波导行波管中的电磁信号的传输损耗进行了仿真研究,考察了流通管孔径、加工粗糙度等对冷腔传输损耗的影响。结果表明,流通管孔径较大或加工粗糙度较大都会导致电磁信号传输严重衰减。模拟分析了热腔中电磁信号衰减对慢波结构净增益、带宽、最佳周期数等器件特征参数的影响,结果显示,电磁信号衰减会使得增益下降和带宽降低。Abstract: The equivalent-conductivity method is applied to the simulation work of electromagnetic transmission attenuation for 345 GHz FWG-TWT(folded waveguide traveling-wave tube). The paper studies the cold model of slow-wave structure and does research on the big factors which influence transmission attenuation, such as the beam tunnels diameter, processing roughness. A big beam tunnel or a large roughness will result in serious electromagnetic attenuation. The paper also studies the hot model of slow-wave structure, and analyzes the effects of electromagnetic attenuation on gain, bandwidth, best length of slow wave structure. Results show that electromagnetic attenuation causes gain reduction and bandwidth decreases.
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Key words:
- terahertz /
- FWG-TWT /
- roughness /
- metal conductivity /
- transmission attenuation
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