Full modal analysis of confocal coaxial elliptical waveguides

An efficient method for analysing confocal coaxial elliptical waveguides is presented. Using elliptical coordinates, the differential Helmholtz equati on is transformed into a linear matrix eigenvalue problem by means of the m ethod of moments. The expressions of the vector mode functions for the full spectrum of these guides are constructed, including the TEM, TM and TE mod es. The convergence of the method is very good, giving an efficient and acc urate code. Comparisons with numerical results found in the technical liter ature validate the presented theory.