A uniform evaluation of the PO integral for 2D cylinders with arbitrary contour

The PO approximation is a well-known technique used to analyze very large conducting structures. In scattering problems and radiation of large reflectors the PO technique provides acceptable accuracy [1-2] for some applications. This technique allows to avoid the hard solution of the MoM linear system by approximating this solution by the explicit PO current. The radiated field can be computed by direct integration of these currents. When the scatter is very large, the numerical evaluation of the PO integral can be very time-consuming. In order to speed up this process a number of techniques such as the stationary phase method (SPM) [3-4] fast multilevel techniques [5-6] and path deformation techniques [7] have been proposed.