Equivalent circuit method is usually used before. This method has apparent defect, that is,the ignorance of higher order mode effect, which can greatly affect the computational accuracy.
以前一般采用等效电路法分析和设计脊波导元器件；这种方法的缺点比较明显，那就是对高次模的影响不加考虑，使得计算精度大受影响，在较高要求的场合甚至完全不可用。
参考来源 - 脊波导中主模及各高次模k·2,447,543篇论文数据，部分数据来源于NoteExpress
最后讨论了高次模对均匀场的影响。
The effeetion of the higher order modes on the uniform field is discussed.
高次模通带分布均匀合理，带间无重叠，不存在陷阱模。
There is no overlap between the bands, therefore no trapped modes.
具体数值研究了波导高次模求解精度和剖分疏密的关系。
The relation between computation accuracy and division mesh is investigated numerically.
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