Dipole antenna unit and base station antenna

A dipole antenna unit, comprising

• two support plates (10), the two support plates (10) being perpendicularly crossed, each support plate (10) being provided with a first copper-clad region (11), a second copper-clad region (12) and a third copper-clad region (13), the second copper-clad region (12) being spaced from the first copper-clad region (11), and the first copper-clad region (11) comprising a balun (111) and a first dipole arm (112) connected to the balun (111);
• wherein the dipole antenna unit is further provided with a second dipole arm (121, 20), the second dipole arm (121, 20) being coupled to the first dipole arm (112) in a non-contact manner;
• the second copper-clad region (12) serving as the second dipole arm (121), and a coupling gap (17) being provided between the second dipole arm (121) and the first dipole arm (112);
• the support plate (10) is provided with a first side and a second side opposing to the first side, the first copper-clad region (11) and the second copper-clad region (12) are arranged on a surface of the first side of the support plate (10), the third copper-clad region (13) is arranged on the second side of the support plate (10), the third copper-clad region (13) comprising a third dipole arm (131), and the third dipole arm (131) being coupled to the first dipole arm (112) and the second dipole arm (121) separately in a non-contact manner.