Finite-Element Analysis of Three-Dimensional Waveguide Transfer Problem-Application to Coaxial Line System.

The article presents finite-element analysis of three-dimensional wave-guide transfer problem. This paper proposes a method in which the Galerkin method using the wave-guide modal functions as the weighting functions, is used for connecting the field on the boundary between the wave-guide and the discontinuity. Since, the connecting boundary can be taken very closely to the discontinuity in this method, the size of the matrix equation to be solved is small so that the amount of computation is small. There is no restriction between the number of expansion basis of the field by the finite-element method and that of expansion modes in the eigenmode expansion method.