谐振腔反射器的模式匹配分析
Characteristic study of resonant cavity reflector by mode-matching method
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摘要: 利用模式匹配方法对“冷”谐振腔反射器的反射特性进行了理论分析，推导出了谐振腔反射器的广义散射矩阵。对应用于X波段低磁场返波管的谐振腔反射器的反射特性进行了研究，并利用数值模拟软件分析了在全反射条件下谐振腔反射器中的电场分布。结果表明:当反射器的内外半径的选取合适时，反射器可以在较短的长度时获得较大的反射，而且反射系数对反射器长度的变化不敏感。Abstract: The resonant cavity reflector has been used in the backward wave oscillators for producing multi-gigawatt power and operating at low magnetic field. The reflection characteristics of the “cold ” resonant cavity reflector is analyzed by means of the mode-matching method, and the scattering matrix of the reflector is derived. The electric field distribution in the reflector is studied by means of numerical simulation under total reflection condition. The results indicate that with suitable inner and outer radius, high reflection can be obtained with short cavity length, and the cavity length does not affect the reflectivity remarkably.
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