固定频率后同轴谐振腔尺寸与TMn10模式阶数的可调性
Adjustability of coaxial cavity resonator size and TMn10 mode order for given frequency
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摘要: 研究了高频段微波同轴谐振腔高阶横磁模式TMn10的系列相关参数，发现对于确定的工作频率，可以根据器件功率的大小与工作环境的不同而比较自由地选择谐振腔的横截面尺寸及TMn10模式的阶数,即在较高频率下,可以采取较大横截面的腔体以便提升功率。根据计算所得的模式图，调节腔体尺寸和选择工作模式阶数，使工作模式与其相邻的模式有较大的模式间隔以增加带宽，并且获得较大的特性阻抗。编程理论计算的大量结果与用高频电磁场软件ISFEL 3D仿真的结果吻合较好。Abstract: The parameters of higher order transverse magnetic modes TMn10 in coaxial cavity in high frequency band are investigated. It is found for given frequency that the cavity cross-section size and the TMn10 order can be freely chosen according to the power and purpose of the device. This implies that, even in high frequency band, large cavity cross-section size can be adopted, which avails to increase power. To widen bandwidth by making the working mode far away from neighboring modes and obtain great characteristic impedance, we can adjust cavity size and select mode according to the mode charts plotted. The calculation shows good agreement with the simulation using the 3D high frequency electromagnetic field software ISFEL.
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