A high-gain lens antenna based on transformation optics

Transformation of space coordinates can be used as a convenient tool for producing a controlled electromagnetic field pattern. In this paper, we apply a quasi-conformal coordinate transformation to a Maxwell fish-eye lens to design a lens antenna with high gain and low sidelobes, which can be realized by isotropic graded refractive index (GRIN) materials. Using proper simplifying techniques, the designed lens can be made by non-resonant metamaterials or non-magnetic dielectrics having wide frequency band and low losses. The simulation results validate the advantages of the proposed lens antenna.