Calculation of MoM Interaction Integrals in Highly Conductive Media

The construction of the impedance matrix in the method of moments requires the calculation of interaction integrals between the expansion functions, through the Green´s function and its derivatives. The singular behavior of the Green´s function poses considerable problems for an accurate numerical evaluation of these integrals, requiring techniques such as singularity extraction or cancellation. In this contribution we will show why these methods fail when the medium is highly conductive. A novel technique is proposed to handle these highly challenging integrals. The complexity of the new method is independent of the conductivity.