Dual-frequency and dual-polarization antenna used for mobile communication base station

The invention relates to a dual-frequency and dual-polarization antenna used for a mobile communication base station. The dual-frequency and dual-polarization antenna comprises a pair of plane dipoles which are vertically arranged, a parasitic element, a resonance ring, a pair of balance feed Baluns, a medium plate and a reflection plate, wherein the resonance ring is arranged above the reflection plate through a plurality of medium columns; the medium plate is arranged above the reflection plate through a plurality of medium columns; the medium plate is arranged above the inner side of the resonance ring; the plane dipoles are connected with the reflection plate through outer conductors of coaxial cables or short circuit columns; the plane dipoles are arranged on the upper surface of the medium plate in a copper cladding manner; the parasitic element is arranged on the surface of the medium plate in the copper cladding manner; the parasitic element is crossly connected with the plane dipoles; the balance feed Baluns are realized by difference feed of the four coaxial cables; the bottoms of the outer conductors of the four coaxial cables are connected with the reflection plate; and the tops of the outer conductors of the four coaxial cables are connected together by metal. The dual-frequency and dual-polarization antenna has the advantages of easiness of adjustment, good anti-interference effect, stable performance, large signal capacity and the like.