A NEW FAMILY OF EXPONENTIAL INFINITE ELEMENTS FOR THE ANALYSIS OF LOSSLESS ELECTROMAGNETIC WAVE-GUIDES

In this paper the Finite Element Method is employed for the analysis o f electromagnetic lossless waveguides. The curl-curl equation, deduced from Maxwell's equations, is solved for the electric field. We have s tudied the appearance of parasitic solutions and formulated a sufficie nt condition for their elimination which puts a contraint on the Finit e Element spaces for the approximation of the field components. A new family of discontinuous exponential infinite elements is proposed for the analysis of open waveguides: they are employed together with edge elements and a non-linear eigenvalue problem is deduced. We have prese nted numerical results in order to prove the validity of such infinite elements versus the Virtual Boundary Technique.