Ka-band Cross Trapezoid Coupled Cavity Traveling Wave Tube Simulation Studies

As wireless communications and GPS navigation technology development, the wireless communication technology needs a higher power, higher frequency amplifier device. And in high power, high bandwidth requirements under the background, the traditional helix TWT can not meet the above requirements gradually, so TWT is also developmenting the new structure of the tube type, such as the new coupling cavity trapezoid slow wave structure. With the new structure of the constantly, microwave electric vacuum theory was also developing from the original small signal theory research to the nonlinear large signal theory research of slowly traveling wave tube, make traveling wave tube continuously improve power frequency band and efficiency, such as performance index, constantly to a higher power, with more broadband, low noise, high efficiency the direction of development.This paper studies the new slow wave structure-coupling cavity slow wave structure, through the cavity slow wave structure of the coupling theory analysis and by using of3D electromagnetic software HFSS and CST, the coupling cavity slow wave structure make a deep theoretical analysis and simulation research.This paper main job is as follows:(1) We have simulated the dispersion curve,impedance curve and normalized phase speed by the3D electromagnetic software HFSS of the coupling cavity slow wave structure and the slow wave structure of different structure parameters on the slow wave structure high frequency characteristics of the influence of the simulation analysis and research.(2) We obtained the double crisscross coupling cavity slow wave frequency characteristic of structure on the double crisscross coupling cavity slow wave structure characteristics of high frequency characteristics of the simulation and analysis the coupling structure parameters on the influence of the dispersion characteristics, the results show that the structure of the coupling parameters can obviously improve the range of dispersion curve and the parameters can reduce the coupling cavity minimum frequency of the slow wave structure, and it can expand frequency range and reduce its work voltage affectly.(3) We use the3D simulation software of CST electromagnetic particle simulation studio, on the double crisscross coupling cavity traveling wave tube of note-wave interaction process simulation, and analyzes the different working parameters of, the crisscross coupling cavity slow wave structure of note wave interaction effects for later qualitative studies crisscross coupling cavity TWT lay the foundation.