Finite element modeling of two-dimensional transmission line structures using a new asymptotic boundary condition

The finite element method (FEM) is used to study open, arbitrarily configured, two-dimensional transmission line structures in the quasi-TEM (transverse electromagnetic) regime. An improved version of a previously developed asymptotic boundary condition (ABC) is used to truncate the open region. Results for two- and six-conductor configurations are presented to illustrate the superiority of this method over the conventional approach, wherein, a perfectly conducting enclosure is used to truncate the FEM mesh, and the original ABC previously introduced. The results presented are of particular interest for estimating crosstalk and signal distortion in printed circuits.<>