Application of the Spectral Domain Approach and the Modal Analysis to Three Dimensional Discontinuity Problems

This tutorial paper reviews some fundamental principles in applying the Modal Analysis accompanied by the Spectral Domain Approach to the solution of a broad class of three dimensional uniaxial discontinuity problems. It is shown that this combination offers efficient computation of coupling coefficients between eigenmodes at a discontinuity. A case study of a finline complex discontinuity is presented for which it was found that the computed values of reflection and transmission coefficients were in a good agreement with the measured ones.