Design, Microfabrication, and Experiment of a Compact Mode Selection Filter for Sub-Terahertz Sheet Beam Traveling-Wave Tubes

Wan, Yixin; Wang, Jianxun; Li, Xinjie; Liu, Qiang; Shu, Guoxiang; Jiang, Wei; Wu, Zewei; Luo, Yong

doi:10.1109/tmtt.2022.3186209

Cited by 4 publications

(1 citation statement)

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“…This property can be exploited to suppress unwanted higher order modes in waveguides. The latter can be associated to critical oscillations for the operation of sheet beam TWTs, [11], [12]. At the millimeter wave frequencies, these concepts have found application as the so-called 'gap waveguide' which has emerged as a low-cost and low-loss solution.…”

Section: Introductionmentioning

confidence: 99%

Half-Height Pin Gap Waveguide-Based Slow-Wave Structure for Millimeter Wave Traveling-Wave Tubes

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2023

IEEE Trans. Electron Devices

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The design of a W-band traveling-wave tube (TWT) power amplifier based on a groove gap waveguide slow wave circuit is presented in this paper. The technology of gap waveguide is analyzed to aid the design of electromagnetic band gap based slow wave structures in the upper millimeter wave range of the spectrum while alleviating some of the typical fabrication challenges at these frequencies. The results of Particle-In-Cell (PIC) simulations numerically demonstrate a 10-GHz instantaneous 3-dB bandwidth in the range 89-99 GHz with a minimum power gain of 25 dB. A prototype of the complete slow wave structure is manufactured via computer numerical control (CNC) machining and measured to verify the cold simulation results. Machining tolerances and surface roughness are also investigated. The design approach via groove gap waveguide is flexible and can be extended to alternative rectangular waveguide based slow wave structures.

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Section: Introductionmentioning

confidence: 99%