Dual-frequency dual-polarized antenna

The invention provides a dual-frequency dual-polarized antenna, which relates to the technical field of antennas and comprises an orthogonal mode coupler, a first duplexer and a second duplexer, the orthogonal mode coupler comprises a mode separation cavity, a first horizontal polarization branch, a second horizontal polarization branch, a vertical polarization branch, a twisted waveguide structure, a first waveguide and a second waveguide, and the first duplexer is used for transmitting horizontal polarization signals of a first low-frequency band and a second low-frequency band; the second duplexer is used for transmitting vertical polarization signals of the first low-frequency band and the second low-frequency band, the relative bandwidth is increased, the communication capacity of the antenna is increased, due to the fact that the wavelength of the low-frequency band is long and the frequency characteristic of the low frequency of the low-frequency band is low, the influence of other interference such as