The scattering properties of “Super Dense” arrays of dipoles

This paper deals with a new class of dichroic surfaces that are capable of extremely broadbanded reflection properties (from an octave to a decade bandwidth) while being transparent at lower frequencies. It is obtained by having the effective interelement spacing reduced to a very small value without reducing the element size. While such surfaces, referred to as “Super Dense” surfaces, can be implemented in a number of ways, this paper addresses the most fundamental type, namely the type made up of two orthogonal arrays of densely packed wire elements (“dipoles”) arranged in a square grid, and placed almost, but not quite in the same plane. The two orthogonal arrays allow the surface to handle arbitrary polarizations