本文将作为参考波导的圆介质波导模式的特征方程进行了有效的近似简化,使之成为独立的四个简单特征方程组。利用这些方程组作为参考波导的特征方程来计算各种复杂波导的传输参数时,能够大大简化计算工作。

In mode analysis for noncircular, inhomogeneoua and anisotropio dielectric waveguides shift formula methods are widely developed. By these methods the mode parameters and fields of the investigated complex waveguide are calculated by using the known mode parameters and fields of reference waveguide, e.g. circular homogeneous and isotropio waveguide. In order to simplify the calculations of reference waveguide mode parameters, vector successful (VS) approximation is correspondingly used as well. In this paper the accuracy of this approximation is checked and some generalized VS-approximations are proposed, which are quite useful in applicaitons.