Mortar boundary elements for the EFIE applied to the analysis of scattering by PEC junctions

In modelling scattering of time-harmonic electromagnetic waves by perfect electrical conductors (PECs), it would be advantageous to be able to construct the mesh separately on all subcomponents. The so constructed global mesh would be non conforming, but easy to distribute over computational nodes, and would allow for local changes without remeshing. In this contribution, a mortar element boundary method for the electric field integral equation (EFIE) is introduced that allows to find the solution of the scattering problem on a non-conforming mesh. The algorithm is fit to deal with junctions, i.e. curves where three or more PEC sheets meet.