The invention discloses a decoupling structure between adjacent rectangular patches in a double-frequency
antenna array. The decoupling structure comprises a
dielectric substrate,
metal grounding plates arranged on the lower surface and the upper surface of the substrate respectively and two symmetrical double-frequency
metal patches. Two feed probes are arranged on the
metal grounding plate and penetrate through the
dielectric substrate to be in contact with the two patches respectively; a decoupling
branch unit and a short-circuit probe unit are arranged between the two patches, decoupling of space
waves between the two patches is achieved, and a short-circuit probe is arranged on the metal grounding plate and penetrates through the
dielectric substrate to make contact with the decoupling
branch unit; U-shaped grooves are symmetrically etched in the two patches and used for activating the other mode; and a defected ground structure is etched on the metal grounding plate and is used for preventing current from flowing from one patch to the other patch. The
patch antenna array has the advantages of being low in profile, low in manufacturing cost, simple in structure and the like, the original advantages that the decoupling structure is low in profile, easy to manufacture and the like are kept, the original
radiation performance of the antenna is not damaged, and meanwhile a good decoupling effect is obtained.