Design and Theoretical Analysis of Multibeam Folded Waveguide Traveling-Wave Tube for Subterahertz Radiation

A new proposal-multibeam (MB) and power combining (PC) folded waveguide (FW) circuit, which can enhance the interaction efficiency and output power of terahertz (THz) traveling-wave tubes, is presented in this paper. Operating with multiple electron beams and PC means that a larger beam current and...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2015-01, Vol.43 (1), p.414-421
Main Authors: Yan, Shengmei, Su, Wei, Wang, Yajun, Xu, Ao
Format: Article
Language:English
Subjects:
Bandwidth
Circuits
Computer simulation
Electric currents
Electric power
Electron beams
Equivalent circuits
Folded waveguide (FW)
Impedance
Input output
Integrated circuit modeling
Mathematical model
multibeam (MB)
Plasma physics
power combining (PC)
Power generation
subterahertz (THz)
traveling-wave tube (TWT)
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Summary:A new proposal-multibeam (MB) and power combining (PC) folded waveguide (FW) circuit, which can enhance the interaction efficiency and output power of terahertz (THz) traveling-wave tubes, is presented in this paper. Operating with multiple electron beams and PC means that a larger beam current and higher combining power can be obtained. First, equivalent circuit model of MB-FW is used to analyze its cold-test characteristics. Second, small signal model of MB-FW is also applied to evaluate its Pierce gain. Last, the computer simulation technology (CST) code is implemented to simulate high frequency, transmission, and interaction characteristics of MB-PC-FW. The results show this circuit can produce saturated output power of over 66 W with three electron beams in 3-dB bandwidth range of 139-144 GHz. Meanwhile the saturated output power, gain, and efficiency are 95.5 W, 36.79 dB, and 13.8% at 0.14 THz, respectively, whereas the single-beam FW circuit can only produce the saturated output power of 2.63 W in 3-dB bandwidth range of 140-143 GHz. The saturated output power, gain, and efficiency are only 2.7 W, 24.31 dB, and 1.41% at 0.14 THz, respectively.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2014.2375319