Abstract: a patch antenna structure includes: a dielectric substrate, having a first surface and a second surface that face away from each other; a metal ground layer, attached to the first surface of the dielectric substrate and provided with a plurality of slots; and an array of antenna elements, composed of four antenna elements and disposed on the second surface of the dielectric substrate; wherein in the array of antenna elements, a spacing between centers of two adjacent antenna elements in a same row is less than a predetermined standard distance, and antenna elements in adjacent rows are arranged to mirror each other. The embodiments of the present disclosure are simple in structure and are applicable to various scenarios of indoor ultra-wideband base stations.