Multilevel, multiresolution integral equation analysis of printed antennas

A new approach is presented for the integral equation analysis of printed structures, based on the definition of multiresolution vector functions with properties similar to those of the scalar wavelets; in particular, they both possess spatial and spectral resolution. The resulting MoM impedance matrix shows strongly improved features, and especially a good conditioning, that makes the matrix stable against sparsification and the use of iterative methods convenient for the solution of the linear system. Numerical results for a recess-fed patch and an array of monolithically fed rectangular patches are presented.