  A new low-order discretization scheme for the identity operator in the
magnetic field integral equation (MFIE) is discussed. Its concept is derived
from the weak-form representation of combined sources which are discretized
with Rao-Wilton-Glisson (RWG) functions. The resulting MFIE overcomes the
accuracy problem of the classical MFIE while it maintains fast iterative solver
convergence. The improvement in accuracy is verified with a mesh refinement
analysis and with near- and far-field scattering results. Furthermore,
simulation results for a combined field integral equation (CFIE) involving the
new MFIE show that this CFIE is interior-resonance free and well-conditioned
like the classical CFIE, but also accurate as the EFIE.
