用有限元法计算鱼鳍线的色散特性

本文用有限元法从求解非均匀介质填充波导本征值问题入手,计算了鱼鳍线的色散特性.由于计及了鱼鳍厚度对色散特性的影响,故可以修正用其他方法计算的结果.文中用统一的计算程序对鱼鳍线、双脊波导和条形介质加载矩形波导主模和高次模色散特性进行计算,获得了与用别的方法得到的相同的结果.实测的色散特性曲线与考虑了鳍厚的计算值相吻合,证实了所述方法的正确性.

COMPUTING FIN-LINE DISPERSION CHARACTERISTICS WITH FINITE ELEMENT METHOD

In this paper, starting from solving eigenvalue problem of wavegurdes filled with inhomogeneous dielectrics, fin-line dispersion is calculated by means of the finite element method. As a result of considering the effect caused by the fin thickness on dispersion, the results obtained by other methods may be modified. The dispersion characteristics obtained by unified program for fin-line, ridged waveguide and slab-loaded waveguide are in good agreement with results obtained by other methods. Practical measurements of dispersion shaw an agreement between computed results with fin thickness to be considered and experiments, thus justify the discribed method.