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对于离散的金属柱结构构建的周期性平板慢波系统,本文利用3维FDTD方法结合HFSS仿真软件深入分析了该慢波系统的高频特性.研究了金属柱高度、周期长度对色散特性的影响,计算了耦合阻抗,并与传统光栅慢波系统特性进行了对比分析.分析表明金属柱慢波系统既有与传统光栅慢波系统相似的高频特性,又具有独自的特点,位于离散的金属柱周期间隙中的电子注互作用耦合阻抗具有对称性;金属柱结构用作真空电子器件的高频系统可增加发生有效互作用的电子注厚度,降低起振电流密度,提高器件效率.本文的分析结果为设计低电流密度工作的多电子注短毫米波器件提供了依据.
In this paper, we analyze the high frequency characteristics of the slow-wave system by using the 3D FDTD method combined with the HFSS simulation software for the periodic flat-plate slow-wave system with discrete metal column structures. The influence of the height and period length of the metal columns on the dispersion characteristics , The coupling impedance was calculated and compared with the traditional grating slow wave system.The analysis shows that the metal column slow wave system has the similar high frequency characteristics as the traditional grating slow wave system but also has the unique characteristics that the discrete metal The symmetry of the coupling impedance of the electron-injection interaction in the period of the column-column gap can be achieved by using the metal-column structure as a high-frequency system for vacuum electron devices, which can increase the electron injection thickness, reduce the current density and improve the device efficiency. The results provide the basis for designing multi-electron short-millimeter-wave devices that operate at low current densities.