The electromagnetic scattering from composite anisotropic dielectric and co
nducting structures is modeled by hybrid partial differential equation-inte
gral equation formulations. We emphasize the role of edge elements for both
the partial differential equation and the integral equation discretization
and for the coupling of the two. Numerical results from the various formul
ations presented here and measurements are compared in order to obtain test
cases for the development and validation of numerical methods.