0.34 THz双注高次模折叠波导行波管高频系统设计

赵征远; 刘文鑫; 杨龙龙; 欧粤

doi:10.11884/HPLPB202133.210002

0.34 THz双注高次模折叠波导行波管高频系统设计

doi: 10.11884/HPLPB202133.210002

赵征远^{1, 2,},
刘文鑫^{1, 2, ,},
杨龙龙^{1, 2},
欧粤^{1, 2}

1.
中国科学院大学，北京 100039
2.
中国科学院空天信息创新研究院，北京 100094

基金项目: 国家重点研发计划项目（20119YFA0210201）；国家自然科学基金项目（U1832193，61831101）

详细信息

作者简介:
赵征远（1996—），男，在读硕士研究生，从事太赫兹折叠波导行波管研究

通讯作者:
刘文鑫（1976—），男，研究员，从事太赫兹真空器件研究

中图分类号: TN124
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- 被引次数: 0
出版历程
- 收稿日期: 2021-01-04
- 修回日期: 2021-03-28
- 网络出版日期: 2021-04-16
- 刊出日期: 2021-05-20

Design of high frequency system of 0.34 THz high order mode two-beam folded waveguide traveling wave tube

Zhao Zhengyuan^{1, 2
,},
Liu Wenxin^{1, 2
, ,},
Yang Longlong^{1, 2},
Ou Yue^{1, 2}

1.
University of Chinese Academy of Sciences, Beijing 100039, China
2.
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

摘要

摘要: 高频系统是行波管的核心部件，它会直接影响行波管的工作频率、带宽、增益等性能指标。为了获得更大的输出功率和更高的增益，对0.34 THz双注高次模折叠波导行波管的基本特性进行了研究，计算了双注折叠波导的色散特性和耦合阻抗，并与仿真结果进行对比，结果显示色散特性随频率升高差距增大，耦合阻抗在高频段匹配较好，并研究了损耗特性。利用CST仿真工作室对双注折叠波导的注波互作用特性进行了仿真，实现41.68 W输出。为了获得更高的输出，通过增大直波导高度，最终使输出功率提高了52.7%，达到63.12 W。最后设计了符合要求的盒型输出窗和模式转换器，验证了高频系统的传输特性。
- 双电子注折叠波导 /
- 慢波结构 /
- 注波互作用 /
- 相速渐变 /
- 输出窗 /
- 模式转换器
Abstract: High frequency system is the key part of folded-waveguide (FW) traveling-wave tube (TWT), it will directly affect the operating frequency, bandwidth, gain and other indicators of TWT. In order to obtain larger output power and higher gain than a conventional single-beam FWTWT, the basic characteristics of the 0.34 THz high order mode two-beam FWTWT are studied. Firstly, the dispersion characteristics and interaction impedance of two-beam FW are calculated and compared with the results of simulation. The results show that the theory of dispersion characteristics is consistent with the simulation results and the interaction impedance matches well in high frequency band. CST studio suite is used to simulate the beam-wave interaction of the two-beam FW, and the output power is 41.68 W. In order to obtain high output, the height of the straight is increased. And the 63.12 W output is obtained with an increase of 52.7%. High frequency system is constituted by mode converter and output window structure, and good transmission characteristics are obtained within 25 GHz bandwidth. In the operating bandwidth, |S₁₁| is greater than 15 dB, |S₂₁| is less than 4.5 dB.
- two-beam folded-waveguide /
- slow wave structure /
- beam wave interaction /
- phase-velocity taper /
- output window /
- mode converter

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图 1 双电子注折叠波导结构图

Figure 1. Geometry for the TWT with two-beams

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图 2 场强分布图

Figure 2. Field contour plots for the FW

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图 3 折叠波导色散特性对比图

Figure 3. Dispersion characteristics of FW

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图 4 耦合阻抗对比图

Figure 4. Interaction impedance

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图 5 双注折叠波导CST模型图

Figure 5. Model in CST

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图 6 双注参数对输出的影响

Figure 6. Output power vary two-beam parameters

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图 7 输出功率图

Figure 7. Output power

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图 8 频谱图

Figure 8. Spectra of the signal

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图 9 输出功率随频率变化图

Figure 9. 3 dB bandwidth

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图 10 电子轨迹图

Figure 10. Schematic diagram of the electron trajectories

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图 11 7 ns时电子相空间图

Figure 11. Electronic energy distribution at 7 ns

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图 12 相速渐变的输出功率

Figure 12. Output power with phase-velocity taper

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图 13 输出功率随窄边变化

Figure 13. Output power vary narrow side

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图 14 盒型窗模型图

Figure 14. Model of pill- box window

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图 15 盒型窗的参数

Figure 15. Parameters of pill-box window

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图 16 模式转换器模型图

Figure 16. Mode converter

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图 17 模式转换器的S参数

Figure 17. S parameters of mode converter

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图 18 高频系统模型图

Figure 18. Mode of high frequency system

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图 19 高频系统的S参数

Figure 19. S parameters of high frequency system

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表 1 慢波结构参数

Table 1. Structure parameters of slow wave structure (mm)

a b h p r d

1.12 0.10 0.18 0.22 0.07 0.56

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表 2 盒型窗结构参数

Table 2. Structure parameters of pill-box window (mm)

r₁ r₂ d₁ l₂ A₁ B₁

1.86 1.06 0.10 1.50 0.711 0.355

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参考文献(18)

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