P-FFT Accelerated EFIE with a Novel Diagonal Perturbed ILUT Preconditioner for Electromagnetic Scattering by Conducting Objects in Half Space

Figure 2

Eigenvalue distribution of the linear systems resulting from the preconditioned linear system equation (12) obtained with (a) EFIE-NO; (b) EFIE-ILUTP5; (c) EFIE-ILUT; and (d) EFIE-DP-ILUT. The red solid circle is the shifted-unit-circle.

(a)

(b)

(c)

(d)