Circularly polarized radiation by a dipole antenna over an innovative artificial ground plane

This paper presents a novel low profile circularly polarized antenna. The antenna structure consists of a single dipole over a wire made non uniform high impedance surface. The proposed design incorporates the following concepts simultaneously: artificial high impedance surfaces or magnetic conductors, metamaterials showing refractive indexes of less than unity (n < 1), and polarizing structures. In addition, it can be considered a computationally efficient design because it is entirely made of wires. In order to show the soundness of the underlying idea, it is successfully applied to the design and optimization of a FM broadcasting antenna, as a tangible example.