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在引用相关文献结论的基础上,首先由静态场在相同边界条件下得出电场的解,再乘以波动因子得到TEM波的电场解,然后根据由麦克斯韦方程所联系的电场与磁场的关系,得到磁场的分布,从而给出内圆外方同轴传输线中TEM波的电磁场分布规律,通过Matlab绘制出TEM波在其横截面上的结构图,计算出其特性阻抗。研究结论对于计算该传输线的衰减系数,了解其功率容量,考虑功率耦合及设计有关的有源器件均有一定的参考价值,对任意截面传输线研究也具有理论意义。
Based on the citation of related literatures, the solution of the electric field is obtained from the static field under the same boundary conditions, and then the electric field solution of the TEM wave is multiplied by the fluctuation factor. Based on the relationship between the electric field and the magnetic field which is related to the Maxwell equation, The distribution of the magnetic field is obtained, and the electromagnetic field distribution of the TEM wave in the coaxial transmission line is given. The structure diagram of the TEM wave in the cross section is obtained by Matlab, and the characteristic impedance is calculated. The conclusions of the research are helpful to calculate the attenuation coefficient of the transmission line, understand its power capacity, consider the power coupling and design related active devices, and have theoretical significance for the research of transmission lines with arbitrary cross section.