Analysis of antennas in the presence of large composite 3-D structures with linear embedding via Green´s operators (LEGO) and a modified EFIE

We combine the linear embedding via Green´s operators method with an electric field integral equation (EFIE) to solve the problem of an antenna system which radiates in close proximity of a large 3-D structure. Upon rearranging the relevant equations we include the contribution of the large structure into the EFIE posed over the antenna surface — which results in a “modified” EFIE. The latter can be solved by MoM and direct methods as long as the antenna system is not too large. Therefore, the present approach is superior to the bare MoM, which (for the same problem) would yield a huge matrix to be inverted through iterative methods. We provide validation of the proposed strategy as well as an example of application to a real-life antenna operating nearby a finite frequency selective surface.