A Numerical Comparison of an Isogeometric and a Parametric Higher Order Raviart–Thomas Approach to the Electric Field Integral Equation

We discuss numerical experiments to compare an isogeometric discretization of the electric field integral equation and a parametric Raviart-Thomas approach. Therein, we focus on accuracy with respect to degrees of freedom, briefly commenting on the conditioning of the system as well. Due to the utilization of parametric mappings even in the Raviart-Thomas approach, our investigation disregards any errors induced by meshing, which commonly favors the isogeometric approach when compared to curvilinear higher order Raviart-Thomas elements.