Low-frequency radiation unit

The low-frequency radiation unit comprises a radiation structure, the radiation structure is composed of two T-shaped dielectric plates which are arranged in an orthogonal polarization mode, each T-shaped dielectric plate comprises a radiation part and a balun part, the front face of each radiation part is provided with a radiation circuit, the front face of each balun part is provided with a first balun circuit, and the back face of each balun part is provided with a second balun circuit; the radiation line is connected with the first balun line, the second balun line is fed to the first balun line through coupling, and the first balun line transmits a signal to the radiation line. The dielectric plate is connected with the first balun circuit through the impedance matching section, the balun part obtains signals from a power division substrate connection point and transmits the signals to the second balun circuit, the second balun circuit feeds the signals to the first balun circuit through coupling, the fi