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In this paper, the feasibility of developing W-band helix TWTs is demonstrated and the design of a W-band helix TWT is carried out. The simulation results show that the output power of the TWT is more than 28W with the electron efficiency of 6.6% and a gain of over 39dB.
In this paper, the design and optimization of a V-band helix TWT is carried out and prototype tubes have been assembled. The test results show that the output power of the TWT is over 15W with the overall efficiency of over 14.5% and a gain of over 43dB. The beam transmission experiment shows that a transmission ratio is over 97%.
Investigation of high frequency vacuum devices using microfabrication is reported. TWT and BWO design and simulation is discussed. Design is based on theoretical analysis and equivalent circuit method.
A dynamic velocity taper (DVT) characterized by exponential taper pitch have been designed for high efficiency millimetre wave TWT. Design result in K and Ka band shows a great improvement of electron efficiency. The experimental results can reach 23% in Ka band and 25% in K band TWT.
A kind of broadband microwave window for W-band TWT is manufactured. The measurement result reveals that the pass bandwidth is more than 10 GHz in W-band which has met the requirements of the TWT.
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