Single-layer broadband planar antenna using ultrathin high-efficiency focusing metasurfaces

Hou Hai-Sheng, Wang Guang-Ming^†, Li Hai-Peng, Guo Wen-Long, Li Tang-jing, Cai Tong^‡

(color online) (a) Schematic used to describe the focusing effect. (b) Schematic used to describe the operating mechanism of planar antenna.