The use of Random Auxiliary Sources for reflectarray feed analysis

Accurate modeling for reflectarray antenna feeds is performed via using equivalent Random Auxiliary Sources (RAS) problems for both radiating and scattering modes. The developed models are proposed to accurately predict aperture efficiency components for reflectarray analysis. They are also used in an iterative process using the multiple reflection algorithm (P. Kildal et al, IEEE Trans. on Antennas and Propagations, 45, 7, 1130–1139, 1997) to accurately predict the gain and radiation pattern of the reflectarray antenna in the presence of the feed.