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In this contribution, a discretisation of the IBC EFIE is introduced that (i)yields the correct solution at arbitrarily small frequencies, (ii) requires forits solution a number of matrix vector products bounded as the frequency tendsto zero and as the mesh density increases. The low frequency stabilisation isbased on a projector-based discrete Helmholtz splitting, rescaling, andrecombination that depends on the low frequency behaviour of both the EFIEoperator and the surface impedance condition. The dense mesh stabilisation is amodifcation of the Perfect Electric Conductor operator preconditioning approachtaking into account the effect on the singular value spectrum of the IBC term.

A Low-Frequency and Refinement Stable Impedance Boundary Condition EFIE