The general expressions of the coupling matrix and scattering matrix are given by analyzing the discontinuity unit of a coaxial and symmetrical circular waveguide step.

• 以圆波导同轴对称阶梯为例,匹配不连续性处的横向电场和磁场,推导出了具有通用性的各散射参数表达式,以及膜片基本单元的散射矩阵公式。