高阶模抑制型MILO慢波结构高频特性分析
Rigorous analysis of high-frequency characteristics of higher-order depressed MILO slow wave structure
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摘要: 理论分析了高阶模抑制型磁绝缘线振荡器（MILO）慢波结构，推导了其各分区电磁场分布。通过对场分布的进一步分析可以发现，角向开槽使得原始MILO结构中的两个简并的HEM11模式去简并，分裂成为极化方向与开槽方向垂直或平行的两个模式；通过改变慢波结构叶片间开槽角向位置相对关系，可以破坏高阶模式之间模谐振关系，从而抑制高阶模式的起振，使器件稳定工作在基模。Abstract: The slow wave structure (SWS) of higher-order depressed magnetically insulated transmission line oscillator (HDMILO) is analyzed rigorously, and the electromagnetic field distribution is derived. High-frequency analysis results reveal that the degeneracy of two degenerate HEM11 modes is removed by the slot in SWS plate and the two degenerate modes split into two modes which polarize perpendicularly. Adjusting the azimuthal position of the slots destroys longitudinal oscillation condition of higher-order modes.
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