A patch antenna structure is disclosed. The patch antenna structure includes a radome; a metal substrate disposed on one side of the radome and kept at a distance from the radome, a side wall of the radome facing to the metal substrate connecting with a feeding patch, or a side wall of the metal substrate facing to the radome connecting with a feeding patch; an antenna radiating patch attached to a side wall of the radome facing to the metal substrate, wherein the antenna radiating patch is kept at a certain distance from the metal substrate to maintain the radio frequency characteristics of the patch antenna.