Radiation of apertures arrays mounted on large conducting structures through a Characteristic Basis Function (CBF) approach

An extension of the Characteristic Basis Function Method (CBFM) for handling radiating problems involving structures with apertures (slots) is presented in this communication. Two numerical examples are presented: a slot, fed by a waveguide, mounted on a large platform, and two slots mounted on a large cylinder. The proposed procedure exploits the localization properties of the CBFM. Specifically, it is shown that the problem can be solved by replacing the slots with PEC and by applying the CBFM to the entire structure, using appropriate magnetic current densities as sources. These magnetic current densities are obtained by solving a local problem.