Research On Ka-Band And W-Band Extended Interaction Oscillators

Millimeter wave is an electromagnetic wave which has a frequency range of 30 to300 GHz,and the corresponding electromagnetic wave has a wave number ranging from 1 to 10 cm^-1.The millimeter wave vacuum electric device（VED）is a very important research direction in the field of millimeter wave,and has great value in millimeter wave applications.Extended Interaction Oscillator（EIO）is a common VED,which is favored by millimeter wave researchers because of its high power,high efficiency and miniaturization in millimeter wave band applications.In this paper,theoretical and simulation studies are carried out on Ka-band and W-band beam-shaped EIO.The specific work carried out is as follows:1.The working principle,characteristics and application of the EIO structure are briefly described,and the dispersion characteristics of the rectangular cavity structure are derived.2.A simulation study of the Ka-band beam-shaped EIO structure was carried out.The electromagnetic simulation software CST was used to simulate the dispersion curve,quality factor and S-parameter of the beam-shaped EIO,and the feasibility of the 38GHz beam-shaped EIO parameter was verified.Based on the determination of the band-shaped EIO structure parameters,the study was carried out.The influences of structural parameters on the EIO dispersion characteristics and quality factors of the band-shaped EIO are researched.The MAGIC software is used to calculate the particle of the high-frequency structure.The best working voltage is obtained by scanning the voltage at the working frequency,the input current is reduced to obtain the starting current;The coupling hole parameters and the waveguide height of the output are optimized.The best coupling hole length is 6mm,short side is 1.5mm,height is 0.5mm,and the best waveguide height is 16mm;The best working voltage is 20.4kV,and the average output power of the waveguide is 9.3kW at current is 1.35A.The electronic injection modulation depth is 29.4%,the energy conversion efficiency is 33.8%;the minimum magnetic field of the constrained electron injection is 0.3T,and the starting current is 0.54A.The results show that the presence of errors in the cathode has no effect on the structure output.3.A simulation study of the W-band beam-shaped EIO structure was carried out.The electromagnetic simulation software CST was used to simulate the dispersion curve,quality factor and S-parameter of the beam-shaped EIO,and the feasibility of the beam-shaped EIO parameter was verified.The particle calculation software MAGIC was used to calculate the particle of the beam-shaped EIO.Optimal working voltage and starting current,and optimize the coupling hole parameters of the output and the waveguide height.The best output is that the long side of the coupling hole is 1mm,the short side is 1mm,the height is 0.5mm,and the optimum waveguide height is 15mm.The beat working voltage is 11.4kV,the starting current is 0.48A,and the maximum output power is 1202W.The modulation depth is 37.5%.4.Finally,the 38GHz beam-shaped EIO experiment design was carried out and the preliminary preparation work of the experiment was carried out.