非理想同轴线的简正孪生模式及其复传播常数的近似解法

The Twin Wave Modes in Imperfect Coaxial Line and the Approximate Solution of Its Complex Propagation Constant

本文严格地分析了非理想同轴线中的简正波型，重点讨论了传输线模ＥＨｏｏ模以及常用的ＥＨｏｐ模和ＨＥｏｐ模（ｐ≥１），并对其截止频率进行变分分析，从而导出复传播常数的公式，结果表明，对于常用的ＥＨｏｏ模和ＥＨｏｐ的模，功率损耗法得出的衰减常数是本文公式实部的近似。

A rigorous analysis of the twin wave modes in imperfect coaxial line is presented,with emphasis on the transmission line mode EH mode and the commonly used EHop modes and HEop modes(pa≥1) ,and the variational expression of the cut-off frequency is derived. Then the formulation of the complex propagation constant is given. It is shown that the attenuation constant is the appoximation of the real part of the formulation in this paper.