An antenna structure suitable for 5G use includes first and second antenna units. Each second antenna unit is positioned between adjacent first antenna units. Each first antenna unit is positioned between adjacent second antenna units. Each first antenna unit and each second antenna unit are restricted to emit a radio beam in a single polarization. The first antenna unit emits radio waves in a first polarization, the second antenna unit emits waves in a second polarization. The first polarization direction and the second polarization direction are perpendicular to each other.