Efficient calculation of the reduced matrix in the characteristic basis functions method

A new efficient technique for calculating the reaction between characteristics basis functions has been presented. The proposed method enables us to bypass the computation of the off-diagonal of the MoM matrix. For the case of contiguous blocks, an efficient hybrid approach has been developed that combines the conventional MoM matrix approach with the interpolation technique. Numerical results show that the technique is able to speed up the reduced matrix filling time without sacrificing the accuracy of the RCS results.