Low profile microwave lens antenna based on isotropic Huygens’ metasurfaces

An isotropic electromagnetic (EM) lens based on Huygens’ metasurface is proposed for 28.0 GHz lens antenna design. .The lens consists of a series of non-resonant and subwavelength metallic patterns etched on both sides of an ultrathin .dielectric substrate. Both electric and magnetic responses are introduced to realize desired abrupt phase change and .high-efficiency transmission for the secondary wavelets in the incident wavefront. Then, a substrate-integrated wa