Research On 220GHz Relativistic Backward Wave Oscillator

There are many kinds of high power microwaves so far, relativistic backward wave oscillator is one of them, its characteristics have four parts, including simple structure, easy to start up, large power, wide frequency band, therefore it has a very high research value in some aspects. Under the continuous efforts of the scientific research scholars from each country, relativistic backward wave oscillator has a very big development in some frequency band, such as the X band, Ka-band, but a 220 GHz relativistic backward wave tube has not been widely studied.A 220 GHz relativistic backward wave oscillator is mainly studied in this article, the single-grating rectangular waveguide is utilized as the slow wave structure(SWS), the main contents of the article revolves around the following four parts:1. First of all the single-grating rectangular waveguide is studied, then its dispersion characteristics is analysed in detail, by studying the fluence of the various geometric parameters of the single-grating rectangular waveguide on its dispersion characteristics, thus a conclusion that the single-grating height and single-grating cycle are the main factors influencing the high frequency characteristics is got, then by scanning the parameters of the SWS, the SWS is finally determined.2. For the sake of making the signal output as much as possible from the output end, a detailed research on the transmission characteristics of the resonant reflector is been made, its theory is analyzed and geometrical parameters is designed, by means of the simulation analysis of the HFSS electromagnetic simulation software, adjusting various parameters, we make the reflector have the max wave reflection at 220 GHz. And then we made the research on the transmission characteristics of the output waveguide, by adjusting its geometric parameters, we make its wave transmission be max and wave reflection be minimum at 220 GHz.3. A 3d electromagnetic simulation software is utilezed to simulate the beam-wave interaction, including the effect on the output signal of the electron beam voltage, current, bunching magnetic field and single-grating rectangular waveguide period length, in addition, we also study and analyse the influence of the reflector, by adjusting its parameters, a stable output power of 18 MW at 220 GHz is obtained eventually.4. On the basis of computational simulation, when the output signal is got, we measure the frequency and power through specific experiment, here a pulse solenoid focusing magnetic field and a electronic sources of high pressure and high current based on Tesla transformer are used, when triggered, oscilloscope and quantity of heat meter are used to capture the output signal, and then analysis the power and frequency of the output signal.