Design Of Key Components Of New Type Broadband High Power Millimeter Wave Band Sheet Electron Beam Traveling Wave Tube

As a kind of device with the highest market share in the family of vacuum electronic devices,traveling wave tube has wide application in national defense safety,scientific research and satellite communication.Slow wave structure as the core components of traveling wave tube,its performance directly affects the performance of traveling wave tube.Many countries include China,which have the strong military and technological power have been developing the research of novel slow wave structure.In 2010,Dr.Xu Xiong of UESTC proposed a sine waveguide suitable for sheet electron beam.It is proved that sine waveguide is a new slow wave structure with many advantages.This thesis based on the conventional sine waveguide slow-wave structure,the W-band kilowatt-class traveling wave tube and the 140 GHz sine waveguide traveling wave tube are further optimized to provide the corresponding solution for fully exploiting the potential of the sine waveguide and the subsequent experimental study.Specific work includes:1.Comprehensive and Fair Comparison of Sine Waveguide Slow Wave Structure and staggered double vane Slow Wave Structure Transmission and Reflection Performance.The performance of the two structures is compared with the same operating voltage and the same appearance dimensions.The result of comparison shows that the sin waveguide is superior to staggered double vane in performance of transmission and reflection,which proves that the sin waveguide is an excellent slow wave structure with suitable condition.Meanwhile this thesis designs a novel ladder-like gradient concentrated attenuator.The result of simulation shows that the novel attenuator has a greater attenuation than the conventional attenuator at the same length.This has the guiding significance to shorten the length of the traveling wave tube2.Based on the conventional sine waveguide slow wave structure and the new ladder-like gradient concentrated attenuator,the microwave studio and the particle studio of CST and HFSS were used to design the W-band kilowatt traveling wave tube.Including the analysis of high frequency characteristics and the simulation of injection-wave interaction.The result of simulation shows that the tuning bandwidth of designed W-band kilowatt-class sin waveguide traveling wave tube up to 8GHz,the peak output power is more than 1200 W between 91-98 GHz,and the peak output power is more than 1300 W between 93-97 GHz.Compared with the design of Dr.XuXiong the design of the paper has improved in the cathode current density and interaction efficiency.3.A 140 GHz sine waveguide traveling wave tube was designed using HFSS and CST.The simulation results show that the design of this thesis has a continuous wave power output of 100 W or more in the range of 130-150 GHz.The maximum average output power is 345 W in the band.The maximum gain is 48.4dB in the band.The maximum interaction efficiency in the band is 8.8%.At the same time,the design of this thesis has lower voltage,current and current density than the design of Dr.XuXiong.Meanwhile,this thesis designs a box type window with bandwidth of more than 40 GHz for sine waveguide slow wave structure.The simulation shows that the standing wave ratio is less than 1.16 in the range of 120-160 GHz.