Sparse grid of metal strips description implemented into finite element formulation

The contribution deals with the implementation of a sparse wire grid model into a standard FEM-formulation using the potentials A and v. Taking advantage of the periodicity of a regular grid structure its electromagnetic behaviour can be described with spatial harmonics. The summation of the harmonics over all wires may be solved thanks to the Hankel function. Expressions for the tangentials of the magnetic field around the grid structure allow an implementation into the weak form of the A, v-formulation by manipulating the Neumann boundary condition term. Hence this lapses a finite element meshing of the grid itself. Reflection and deflection behaviour on a grid structure illuminated by a plane wave impinging under variant incidence angles will be investigated.