| High-power microwave (HPW) source is a key component of HPW weapons. Traditional HPW source has only one frequency. According to the mechanism of HPW effects, the threshold value of effect will decrease significantly while a beat-wave is used to target an electronic system. In this paper, the multi-frequency relativistic backward wave oscillator is studied and over-mode non-uniform slow wave structure was proposed. In the interaction region of relativistic backward wave oscillator, the electron beam can interact with two modes simultaneously, therefore multiple frequencies were achieved. Based on the analysis of principles of the multi-frequency relativistic backward wave oscillator, the physical model was established and particle simulation was carried out. Output of X-band tri-band and quad-band microwave was acquired. The main contents of this paper are as follows:1.The research background of HPW was described and the progress of HPW projects of U.S.Department of Defense was introduced. In addition, the current domestic and international Trends of multi-frequency relativistic backward wave oscillator were summarized, and the purpose and significance was also elaborated.2.The working principle of relativistic backward wave oscillator was elaborated. Based on the analysis of non-uniform slow wave structure, the Conceive of multi-frequency relativistic backward wave oscillator was proposed and a preliminary physical model was established.3.Particle simulation was carried out and output of X-band tri-band microwave was acquired.4. Output of X-band quad-band microwave was acquired when using the two-stage non-uniform slow wave structure as the interaction region of relativistic backward wave oscillator while the length of the first period is less than the second section.5.Scattering matrix of waveguide with mutant structure was derived with the conservation of complex power technique and the reflective properties of the resonant reflector were analyzed using our programming. |
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