WAVE-GUIDE MODE SOLUTION USING A HYBRID EDGE ELEMENT APPROACH

A hybrid edge element approach for the computation of waveguide modes is presented. The electric field is decomposed into its transverse and longitudinal components, which are modeled in terms of two-dimensiona l edge elements and scalar nodal elements, respectively, thereby satis fying the Dirichlet boundary condition at the perfect electric conduct or boundaries and dielectric interfaces. Failure to do so results in t he generation of spurious modes. This approach allows for the modeling of a three-dimensional field quantity over a two-dimensional boundary , namely the waveguide cross section, Another approach, the method of moments, serves as an excellent means of verifying the results obtaine d through use of hybrid edge elements. A comparison of the results obt ained from both techniques are presented, along with the associated fi eld plots obtained from the hybrid edge element approach for several g eometries. (C) 1995 John Wiley & Sons, Inc.