| 0.34 THz双注高次模折叠波导行波管高频系统设计 |
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| 引用本文： | 赵征远,刘文鑫,杨龙龙,欧粤.0.34 THz双注高次模折叠波导行波管高频系统设计[J].强激光与粒子束,2021,33(5):053004-1-053004-8. |
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| 作者姓名： | 赵征远 刘文鑫 杨龙龙 欧粤 |
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| 作者单位： | 1.中国科学院大学，北京 100039 |
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| 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） |
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| 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。
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| 关 键 词： | 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 |
| 收稿时间： | 2021-01-04 |
Design of high frequency system of 0.34 THz high order mode two-beam folded waveguide traveling wave tube |
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| Affiliation: | 1.University of Chinese Academy of Sciences, Beijing 100039, China2.Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China |
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| 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. |
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