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In this paper, a scheme of obtaining the maximum theoretical overall efficiency is explored by optimizing the helix pitch profile of a TWT based on the collectability of spent beam. The detailed design of a Ku-band helix TWT is described according to three optimization goals (theoretical overall efficiency, theoretical collector efficiency and electronic efficiency). The simulation results indicate...
The fundamental method of the design of an ultra-broadband helix traveling wave tube (TWT) with two-section output circuit was analyzed using Pierce small signal theory, and shaped a special helix pitch profile with reduced phase-velocity followed by a positive phase-velocity taper. The slow wave structure with semi-metallic rods, which has good thermal dissipation capability and gives negative dispersion...
Broadband helix traveling wave tube (TWT), because of its wide bandwidth and high gain, has potential applications in electronic countermeasure (ECM) systems and space exploration. It's a challenge to obtain high efficiency TWT over a multi-octave band, since its fundamental efficiency is degraded and harmonic power content is enhanced at lower band frequencies and the efficiency at high frequencies...
A new 26.5-40 GHz helix-TWT with high efficiency has been developed at the Institute of Electronic, Chinese Academy of Sciences, China. The main methods include the optimization of slow wave structure and large signal simulation, and a special 5-stage multistage depressed collector to increase power recovery. The test results show that this device has an average power of 40 W, a gain of more than...
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