Multi-Beam Metasurface Antenna by Combining Phase Gradients and Coding Sequences. - He Wang 012; Yongfeng Li; Hongya Chen; Yajuan Han; Sai Sui; Ya Fan; Zetian Yang; Jiafu Wang; Jieqiu Zhang; Shaobo Qu; Qiang Cheng 002 (IEEE Access, 2019)