A novel preconditioner for the EFIE discretised with the Hdiv inner product

A novel preconditioning for the electric field integral equation (EFIE) discretised with the H
_div
inner product is discussed. It is known that the EFIE suffers from bad accuracy in low-frequency problems. One of the remedies for this bad accuracy is the discretisation method using H
_div
inner product. The EFIE with this discretisation, however, shows slow convergence of iteration methods and, what is worse, a naive application of the Calderon preconditioning is not effective for accelerating the convergence. In this paper, we will propose a new preconditioning, which can efficiently reduce the computational time of the EFIE discretised with the H
_div
inner product.