Li Tang-Jing, Liang Jian-Gang, Li Hai-Peng, Niu Xue-Bin, Liu Ya-Qiao. Broadband circularly polarized high-gain antenna design based on linear-to-circular polarization conversion focusing metasurfaceJ. Acta Physica Sinica, 2017, 66(6): 064102. DOI: 10.7498/aps.66.064102