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采用粒子模拟研究了同轴波导虚阴极振荡器二极管参数对微波效率和频率的影响,得到了由二极管参数改变引起的二极管阻抗变化及其对微波效率的影响规律.借鉴具有慢波结构的高功率微波器件中微波模式特性阻抗的计算方法,给出同轴波导虚阴极振荡器中微波主模式特性阻抗的理论计算公式.将理论计算结果与由粒子模拟对器件进行优化后得到的二极管阻抗进行比较,发现当反映电子束特性的二极管阻抗与微波主模式特性阻抗匹配时,虚阴极振荡器具有较高的束波功率转换效率.进一步用特性阻抗对其他几种典型结构的虚阴极振荡器进行分析,验证了该方法的合理性,为设计高效率虚阴极振荡器提供了理论指导.
The effect of diode parameters of coaxial waveguide cathode oscillator on microwave efficiency and frequency was studied by particle simulation and the change of diode impedance caused by the change of diode parameters and its influence on microwave efficiency were studied.Reference to high power with slow wave structure The calculation method of characteristic impedance of microwave mode in microwave device is given and the theoretical formula of the characteristic impedance of main mode of microwave in coaxial waveguide cathode oscillator is given.The theoretical calculation results are compared with the diode impedance obtained by particle simulation after the device is optimized And found that when the diode impedance reflecting the characteristics of the electron beam matches the characteristic impedance of the microwave main mode, the virtual cathode oscillator has a higher efficiency of conversion of the beam power. Several other typical virtual cathode oscillators are further analyzed by the characteristic impedance , Verify the rationality of the method, and provide theoretical guidance for the design of high efficiency virtual cathode oscillator.