| With the rapid development of military technology, aerospace technology and communication technology, more and more microwave electric vacuum devices are used in the field of radar, space exploration, satellite communication and electronic countermeasure. At the same time, the helix traveling wave tube is put forward to higher requirements, such as wider working frequency band, higher efficiency, greater power output, more stable and reliable. It is on those grounds that the energy coupler with the working frequency 18-40 GHz of the broadband continuous wave helix traveling wave tube and the beam wave interaction with the working frequency 25-27.5GHz of the helix traveling wave tube are studied. The main work is as follows:1. The modeling and Simulation of the transmission device of 18-40 GHz broadband continuous wave traveling wave tube are completed by using CST software. And the influence of structural parameters of the energy transfer device on the transmission characteristics is studied by means of the software. Based on the joint simulation of energy transmission device and slow wave structure, the effects of different connection modes and gradual change length on the transmission characteristics of the whole tube are also studied.2. In addition, the method of separation model is used to optimize the calculation. The simulation results meet the established requirements. It is proved that it is feasible to use the 18-40 GHz ultra wide band helix traveling wave tube. Because of the need to study the beam wave interaction with the frequency 25-27.5GHz of the helix traveling wave tube, the research on the transmission characteristics is carried out first. The energy coupler is simulated at the frequency of 25-27.5GHz. The results show that the energy coupler is suitable for the helix traveling wave tube.3. High frequency characteristics and beam wave interaction of the helix traveling wave tube with working frequency 25-27.5GHz are studied by using HFSS software. The high frequency characteristics of the helix traveling wave tube, including dispersion characteristics, coupling impedance and attenuation constant, are obtained by simulating calculation. And the influence of the slow wave structure parameters on the high frequency characteristics is also studied.4. On the basis of the above, the study of the beam wave interaction is carried out by using 2.5D large signal beam-wave interaction simulation software. Through the pitch jump technique, the saturated output power is greater than 124 W, the electron efficiency is greater than 14.5%. Meets the requirements that the saturation output power is greater than 110 W and the electronic efficiency is greater than 10%. Finally, the parameters were optimized and adjusted in the 2.5D large signal simulation software. The optimized results show that: the saturation output power is more than 143.3W and the electronic efficiency is above 15.9%. The amplification performance of the helix traveling wave tube is improved effectively. |
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