热电子注状态下螺旋线行波管的电磁特性
[Abstract]:Traveling wave tube (TWT) is a kind of very important microwave / millimeter wave electric vacuum device. It has the advantages of high power, high gain, high efficiency and wide band. It is widely used in modern military electronic equipment such as communication, radar, electronic countermeasure and so on. The research on the electromagnetic characteristics of TWT usually ignores the influence of electron beam on the propagation of electromagnetic wave. The electromagnetic characteristics of TWT are measured by studying the standing wave ratio of cold voltage and the characteristics of cold and high frequency. In fact, under the normal working condition of TWT, the existence of electron beam will inevitably affect the propagation state of electromagnetic wave. The electromagnetic characteristics in the hot state deviate from those in the cold state. How to accurately analyze the influence of electron beam on the electromagnetic characteristics of TWT directly affects the accuracy of subsequent beam-wave interaction analysis and, to a certain extent, becomes an important source of error between theoretical analysis and experimental measurement. Taking a broadband TWT as an example, the influence of electron beam on the electromagnetic characteristics of TWT is analyzed in this paper. The main work and innovations of this paper include: 1. Electron beam equivalent medium analysis. Based on Maxwell equation and electro-hydrodynamics, the electron beam propagating longitudinally under the infinite magnetic field focusing and the periodic magnetic field focusing is studied by using the equivalent medium treatment method. The electron beam in infinite magnetic field is equivalent to a uniaxial, reciprocal, anisotropic dielectric Zhang Liang medium. The electron beam equivalent under the periodic magnetic field focusing is a kind of bianisotropic medium, not only the dielectric rate and permeability are Zhang Liang, but also has the characteristic of chiral. On this basis, numerical simulation is carried out to analyze the influence of electron beam parameters on the equivalent medium. Theoretical Analysis of electromagnetic characteristics of Spiral TWT. The spiral guide plane model is used to analyze the unloaded electron beam and the loaded electron beam respectively. The corresponding dispersion characteristics, coupling impedance and characteristic impedance are obtained, and the results are compared with those in the cold state. The correctness of the theoretical deduction is verified. Under the condition of electron beam loading, the influence of electron beam voltage, electron beam current and electron beam radius on the electromagnetic characteristics is analyzed, which provides a theoretical basis for analyzing the influence of electron beam loading on the electromagnetic characteristics of traveling wave tubes. 3. The standing wave characteristics of broadband spiral traveling wave tube are simulated by electromagnetic simulation software CST, and a reasonable attenuation model is designed on this basis. The infinite magnetic field focused electron beam and the periodic magnetic field focused electron beam are loaded into the spiral traveling wave tube, and the corresponding energy transfer system model is established. The electromagnetic simulation software is used to simulate the thermal standing wave characteristics of the infinite magnetic field focused downlink wave tube, and the influence of electron beam parameters on the thermal standing wave characteristics is analyzed.
【学位授予单位】:电子科技大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TN124
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