Nested equivalence source approximation of the MFIE operator

In this contribution, we explore the application of the recently proposed nested equivalence source approximation method to the MFIE operator. We find the radial direction of the equivalence source should be removed to obtain better precision. The impedance matrix approximation precision is tested in detail. Error-controllable approximation of the MFIE operator is the key to extend the NESA to homogenous dielectric problems.