Dual-frequency dual-circularly-polarized horn antenna

The embodiment of the invention provides a dual-frequency dual-circularly-polarized horn antenna, and belongs to the technical field of antennas. The dual-frequency dual-circularly-polarized horn antenna comprises a waveguide, a horn radiator and a circularly-polarized component. And the waveguide is arranged at the end part of the horn radiator. The circular polarization member comprises a dielectric plate and a metal conductive layer printed on one side of the dielectric plate. The dielectric plate is arranged in the horn radiator. The circular polarization component is used for forming an artificial surface plasmon so as to convert a vertical line polarized wave guided by the waveguide into a left-hand circular polarized wave in a part of frequency band and convert a vertical line polarized wave guided by the waveguide into a right-hand circular polarized wave in a part of frequency band. Under the condition of single-port feeding, dual-frequency dual-circular polarization of the horn antenna can be realiz