Broadband dual-polarization back-cavity double-layer microstrip patch antenna

The utility model relates to a broadband dual-polarization back-cavity double-layer microstrip patch antenna. The antenna comprises a grounding structural panel with a semi-closed back cavity, and four probes with four-point feeding are uniformly installed inside the back cavity. An excitation microstrip plate is installed on the opening end face of the back cavity, the end parts of the four probes are connected with the bottom surface of the excitation microstrip plate, a circuit is etched on the top surface of the excitation microstrip plate, a supporting rod is installed in the middle part of the top surface of the excitation microstrip plate, a parasitic microstrip plate is connected with the top part of the supporting rod, and a parasitic patch is installed on the parasitic microstrip plate. The antenna has the advantages of simple structure, low profile, high processing accuracy and no need of foaming structure for support and the like. The antenna inherits most advantages of common microstrip patch antennas and realizes the functions of broadband, high isolation and low cross-polarization of the dual-polarization antenna. The antenna can be utilized as the unit of the broadband antenna array of communication equipment, radar and the like, or as the terminal antenna of radio equipment independently.