Review of hybrid methods on antenna theory

Hybrid methods are robust analysis tools for a large class of complex scattering and radiation problems not amenable to traditional classical methods. In the hybrid technique, a complex radiator is decomposed into parts solved by a combination of numerical and asymptotic methods. Three methods are reviewed here: the hybrid MM/Green’s function method; the field-based hybrid method which combines the method of moments (MM) and the geometrical theory of diffraction (GTD); and the current-based hybrid method which incorporates MM, physical theory of diffraction (PTD), and the Fock theory. The domain of applicability of each method is illustrated with examples.