Abstract: On the basis of the discrete convolution method (DOM), a modified discrete convolution method (MDOM) is proposed by zeroizing the Frobenius norm of the iterative matrix. The storage space and the multiplicative operations of MDOM are similar to those of DOM, but the convergence of the former is more stable than that of the latter. The MDOM is suitable for the electromagnetic scattering or radiation of an electrically-large body, especially for the scattering of the finite periodic structure.

Key words: iterative technique, boundary value problem, EM scattering, discrete convolution, finite periodic array, circular convolution