Low-frequency radiation unit, antenna and base station

The invention provides a low-frequency radiation unit, an antenna and a base station, the low-frequency radiation unit comprises two pairs of radiation arms arranged in a polarization orthogonal mode, each radiation arm comprises a radiation outer ring and a wave-transparent inner ring from outside to inside, the radiation outer ring is provided with a plurality of pairs of open-circuit lines on an annular path of the radiation outer ring, each pair of open-circuit lines comprises two parallel open-circuit lines, and each pair of open-circuit lines comprises two parallel open-circuit lines. The open-circuit line extends from the body of the radiation outer ring to the inner side of the area surrounded by the radiation outer ring. High-frequency signals and intermediate-frequency signals can penetrate through the low-frequency radiation unit, so that the low-frequency radiation unit, the high-frequency radiation unit and the intermediate-frequency radiation unit can be arranged in a co-array mode at the same t