有耗介质中圆柱等离子体波导的内部模式

INNER MODE OF PLASMA CYLINDRICAL WAVEGUIDE IN LOSS MATERIAL *

分析了有耗介质中圆柱等离子体波导的内部模式，重点讨论了波导传播常数随等离子体参数和介质损耗的变化，导出了内部模式的特征方程，并给出了相应特征值的近似解表达式。分析结果表明，磁性耗介质中波导内部模式的束缚条件比电性有耗介质中波导内部模式的束缚条件更容易得到满意；内部模式场仅在ω〉ωｐ条件下存在。

The inner modes in the plasma cylindrical waveguide in a loss material are analyzed, by putting stress on the variation of their propagation properties with plasma parameters as well as surrounding material. The characteristic equations of the inner modes are derived, their relevant approximate solutions are given. The analyses show that the biding conditions of the inner mode are easier to form for the guide coated with magnetic material than that coated with dielectric material. The inner mode fields do only exist when ω>ω p ( ω p is the plasma frequency).