提出用有限元方法分析位于窄边的脊波导主模的截止波长和场结构图以及单模带宽特性，推导出用有限元法计算相关参数的计算公式。编程计算了双脊、单脊和不对称脊波导的特征值，求解了三种脊位于窄边的脊波导的传输特性，并给出了截止波长和单模带宽曲线以及场结构变化。

This paper describes the application of finite element method for obtaining the cutoff wavelength, field pattern and bandwidth in ridged waveguide of ridge on the short side, gives the specific equation of related parameter to the subject. The text computes the eigenvalue of double ridged waveguide, single ridged waveguide and unsymmetry ridged waveguide, transmission of three kinds of ridged waveguides with ridge on the narrow wall are solved for and the useful curves on cutoff wavelength, bandwidth and field pattern are presented.

TN957.52 TN958

甘肃省自然科学基金项目资助（项目编号：3ZS042-B25-034）