Study on slow wave structure and interaction of 2−18 GHz ultra-wide band traveling-wave tube

Jun Lü; Baoliang Hao; Jianyong Kou; Jianling Cui; Zhongzheng Zhou

doi:10.11884/HPLPB202133.210412

Journals >High Power Laser and Particle Beams >Volume 33 >Issue 11 >Page 113001 > Article

High Power Laser and Particle Beams
Vol. 33, Issue 11, 113001 (2021)

Study on slow wave structure and interaction of 2−18 GHz ultra-wide band traveling-wave tube

Jun Lü, Baoliang Hao^*, Jianyong Kou, Jianling Cui, and Zhongzheng Zhou

Author Affiliations

The 12th Research Institute of China Electronics Technology Group Corporation, Beijing 100020, China

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DOI: 10.11884/HPLPB202133.210412 Cite this Article

Jun Lü, Baoliang Hao, Jianyong Kou, Jianling Cui, Zhongzheng Zhou. Study on slow wave structure and interaction of 2−18 GHz ultra-wide band traveling-wave tube[J]. High Power Laser and Particle Beams, 2021, 33(11): 113001 Copy Citation Text

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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.

Keywords

helix negative dispersion positive dispersion traveling-wave tube ultra-wide band

$ {P_0} = {P_{{\text{out}}}}/{\eta _{\text{e}}} $

(1)

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$ {V_0} = {\left( {\frac{{{P_0}}}{{{P_{\text{μ }}} \times {{10}^{ - 6}}}}} \right)^{2/5}} $

(2)

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$ {v_{\text{p}}} = \dfrac{{{v_0}}}{{1 + \dfrac{{0.174\;2}}{{{\beta _{\text{e}}}{r_0}}}\sqrt {F{P_{\text{μ }}}} }} $

(3)

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$ \frac{{{\text{d}}{v_{\text{p}}}}}{{{\text{d}}f}} = - \frac{{bv_{\text{p}}^2}}{{{v_0}}}\frac{{{\text{d}}C}}{{{\text{d}}f}} $

(4)

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$ {v_{\text{p}}} = \frac{\omega }{{{\beta _0}}} = \frac{{2{\text{π }}{{\rm{Re}}} \left( f \right)}}{\varphi }p $

(5)

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$ {K_m} = \frac{{E_{ {\textit{z}} m}^2}}{{2\beta _m^2{P_{\text{r}}}}} $

(6)

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$ \alpha = \frac{{{P_{\text{L}}}}}{{2P}}\left( {{\text{Np/m}}} \right) = 8.686\frac{{{P_{\text{L}}}}}{{2P}}\left( {{\text{dB/m}}} \right) $

(7)

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$ \left\{ \begin{gathered} {B_{\rm{B}}} = \frac{{833}}{{{r_0}}} \frac{{I_0^{{\raise0.5ex\hbox{$\scriptstyle 1$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 2$}}}}}{{V_0^{{\raise0.5ex\hbox{$\scriptstyle 1$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 4$}}}}} \hfill \\ {B_ {\textit{z}} } = \sqrt 2 {B_{\rm{B}}} \hfill \\ \end{gathered} \right. $

(8)