Second Harmonic Suppression for Broadband Helix Traveling-Wave Tubes Using the Phase Velocity Variation of Output Circuit

ZHANG Jinling; YANG Jinsheng; ZHANG Hongxin

doi:10.1049/cje.2016.05.026

Volume 25 Issue 3

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ZHANG Jinling, YANG Jinsheng, ZHANG Hongxin, “Second Harmonic Suppression for Broadband Helix Traveling-Wave Tubes Using the Phase Velocity Variation of Output Circuit,” Chinese Journal of Electronics, vol. 25, no. 3, pp. 577-582, 2016, doi: 10.1049/cje.2016.05.026

Citation:

ZHANG Jinling, YANG Jinsheng, ZHANG Hongxin, “Second Harmonic Suppression for Broadband Helix Traveling-Wave Tubes Using the Phase Velocity Variation of Output Circuit,” Chinese Journal of Electronics, vol. 25, no. 3, pp. 577-582, 2016, doi: 10.1049/cje.2016.05.026

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Second Harmonic Suppression for Broadband Helix Traveling-Wave Tubes Using the Phase Velocity Variation of Output Circuit

doi: 10.1049/cje.2016.05.026

1.
School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China;
2.
Beijing Vacuum Electronics Research Institute, Beijing 100015, China

Funds: This work is supported by National Natural Science Foundation of China (No.61171051, No.60771060).

Received Date: 2014-05-05
Rev Recd Date: 2014-09-05
Publish Date: 2016-05-10

Abstract

Abstract

Based on the principle of phase velocity tapering or stepping output circuit, using the phase velocity variation of the output circuit, four kinds of nonuniform output circuit models have been presented in broadband helix Traveling-wave tubes (TWTs). Taking an example of 6-18GHz, 100W broadband helix TWT and using the improved one-dimensional large signal program, second harmonic suppression performances have been studied by calculating the quantitative relationship between fundamental efficiency, second harmonic output power, and the stepping (tapering) position and strength of phase velocity variation for the four kinds of nonuniform output circuits. From the research results of backward wave and second harmonic suppression feature in two kinds of nonuniform output circuits, we obtained the design principle of phase velocity stepping or tapering, which could suppress the Backward wave oscillation (BWO) and reduce the output power of second harmonic for broadband high-power helix TWTs.
- Backward wave suppression,
- Fundamental efficiency,
- Nonuniform circuits,
- Second harmonic suppression,
- Traveling-wave tube (TWT)

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References(20)

References

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