同轴谐振腔高阶横磁模式参数的研究

Research on parameters of higher-order transverse magnetic modes in cylindrical coaxial cavity resonator

理论计算和分析了微波圆柱同轴谐振腔高阶横磁(TM)模式的系列关联参数.研究发现与圆柱腔相比,同轴谐振腔的TMn10模式有较大的模式间隔,即工作模式能够远离非工作模式的干扰,这有利于保持器件稳定的频率和功率;在保持腔长不变、腔横截面外半径取特定值时,腔内电场峰值位置的轴向特性阻抗随内径的变化存在极大值;在高频段可以采用任意大横截面的腔体结构和任意阶的模式.计算结果与仿真结果相一致.

The inter-related parameters of higher order transverse magnetic （TM） modes in coaxial cavity are calculated and analyzed. It is found that TMn10 modes have large mode intervals. There exists a maximum characteristic impedance while keeping the specific cavity outer radius constant. Large cross-section cavity can be employed in higher frequency range. The solutions show good agreement with the results simulated by ISFEL 3-demention and HFSS, softwares used for electromagnetic simulation. The results calculated can serve as a database from which the optimum seeking in design can be gotten instantly instead of the time-consuming simulation by trial and error.