An overview of the hybrid MM/Green´s function method in electromagnetics

An overview is presented of a hybrid technique for solving electromagnetic radiation and scattering problems by combining the method of moments (MM) with a special Green´s function. The method, referred to as an MM/Green´s function solution, combines the ability of MM solutions to treat geometrically complex bodies with the accuracy and computational efficiency of Green´s function solutions. Compared to a standard MM solution, the MM/Green´s function solution reduces the number of unknowns and thus the computer storage requirements. In most cases the CPU time for the MM/Green´s function solution is considerably less than that for a standard MM solution. An example problem of TM scattering by a semicircular strip in the presence of a circular cylinder is solved by the MM, and by the MM/Green´s function technique with a matrix, exact eigenfunction, and high-frequency Green´s function