Study on slow wave structure and interaction of 2−18 GHz ultra-wide band traveling-wave tube
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摘要: 为满足现代信息化战争对超宽带行波管的需求，对2～18 GHz超宽带行波管的高频慢波结构进行了研究分析。在传统宽带行波管的基础上引入非翼片加载段的正常色散特性，首次实现2～18 GHz 超宽带高频慢波结构设计，最大带宽达到9∶1。同时输出端螺旋线螺距调整为正渐变分布，能够进一步优化低频段二次谐波抑制比，提高高频段饱和输出功率。结果表明，全频带的基波输出功率达到100 W，二次谐波抑制比优于−3 dBc，2 GHz频点二次谐波抑制比优于−5 dBc，为超宽带大功率器件的设计提供了理论基础。Abstract: The high-frequency slow-wave structure of 2−18 GHz ultra-wideband traveling-wave tube (TWT) is studied and analyzed to meet the requirements of modern information warfare for TWT. Based on the traditional wideband TWT, the positive dispersion characteristics of non-fin loading section were introduced to realize the 2−18 GHz ultra-wideband high-frequency slow wave structure, with the maximum bandwidth of 9∶1. Results show that the output power of fundamental wave is up to 100 W, the second harmonic suppression ratio is better than −3 dBc in the full frequency band, and the second harmonic suppression ratio is better than −5 dBc at 2 GHz, which provides a theoretical basis for the design of ultra-wideband high-power devices. At the same time, the spiral pitch at the output end is adjusted to a positive gradient distribution to further optimize the low frequency secondary wave suppression ratio and improve the saturation output power of the high frequency band.
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Key words:
- ultra-wide band /
- positive dispersion /
- negative dispersion /
- helix /
- traveling-wave tube
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图 5 正反常色散和螺距组合下的高频慢波结构
Figure 5. High frequency slow wave structures with positive and negative dispersion and different pitch
图 6 冷参数特性随频率的变化规律
Figure 6. Characteristics of cooling parameters varying with frequency
图 7 不同的螺距P1与P0色散曲线比较
Figure 7. Comparison of dispersion curves of different pitch P1 and P0
图 9 不同L1/Li下基波输出功率和二次谐波比
Figure 9. Fundamental output power and 2nd harmonic ratio at L1/Li
图 10 不同L1段长度下基波输出功率和二次谐波比
Figure 10. Fundamental output power and 2nd harmonic ratio at different lengths of L1
图 11 不同螺距P1下的基波输出功率和二次谐波比
Figure 11. Fundamental output power and 2nd harmonic ratio at different pitch of P1
图 12 均匀磁场和周期磁场聚焦的谐波比、饱和输出功率和电子效率的比较
Figure 12. Comparison of harmonics, saturated output power and electronic efficiency of uniform and periodic magnetic field
图 13 18 GHz处的均匀磁场和周期磁场聚焦的电子轨迹
Figure 13. Electron trajectories of uniform and periodic magnetic field at 18 GHz
图 14 Helix 1-1和helix 1-2的谐波比，饱和输出功率和电子效率的比较
Figure 14. Comparison of harmonics, saturated output power and electronic efficiency of helix 1-1 and helix 1-2
表 1 基本参量
Table 1. The basic parameters
$ {V_0} $/V $ {I_0} $/A $ a $/mm $ {r_0} $/mm 4500 0.18 0.72 0.288 
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表 2 高频慢波结构参量
Table 2. High frequency slow wave structure parameters
Vn/(°) Rl/mm Rs/mm W1/mm W2/mm Rc/mm 65 1.27 1.02 0.4 0.4 1.65
下载: 导出CSV
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