EFIE singularity treatments and their effects on characteristic mode dynamic range

The limited eigenvalue dynamic range calculated from a characteristic mode solution is studied. Two methods of handling singular terms in the electric field integral equation matrix filling process are reviewed. Characteristic mode solutions using each singular treatment are compared with modal solutions obtained from a commercial solver. Results show that small alterations to the handling of singular terms in the matrix fill stage can lead to large gains in spectral depth. These gains outpace improvements obtained by increasing total mesh density.