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The paper puts forward a design thought of phase velocity tapering in the design of 140GHz folded waveguide traveling wave tubes. It can make electron with traveling wave field synchronization again in output segment of interaction circuit. By the phase velocity analysis and optimized design, the big signal simulation is calculated in operating voltage 14.05kV and current 25mA. The efficiency is improved...
The modified pill-box window is designed and manufactured as a power-coupler part of the 220-GHz folded waveguide backward wave oscillator in the Institute of Applied Electronics. Owing to the modified structure, both the fringe area and the end area of the thin dielectric window piece can be metalized, thus the reliability of vacuum seal and strength can be greatly improved compared with its traditional...
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