摘要
采用模匹配方法分析了月形波导和加片圆波导的截止频率。波导中的场采用半数阶Bessel函数展开并令其满足边界条件,从而获得截止频率的特征方程国。根据本文所给公式可求解任意尺寸的月形波导、倒月形波导和加片圆波导的截止频率,并获得稳定的、具有高精度的解。
The Lunar waveguides and vained circular waveguides are analyzed by using the mode matching method. The fields in the waveguides are expressed by cylindrical harmonic expansions in which Bessel functions with half orders are involved and the boundary conditions are imposed. Characteristic equations for cutoff wave numbers for both TE and TM modes are obtained. Several waveguides of different relative dimension are calculated, and the results show high accuracy and are considerably steady.
关键词
月形
波导
截止频率
加片圆波导
Lunar waveguide
Cutoff wave number
Cylindrical harmonic expansion
Addition theorem
Boundary condition
