A phased array antenna comprising a plurality of patch antenna elements spaced apart at a predetermined distance from each other comprised between λ /2 and λ, λ being an operative wavelength of the phased array antenna; and a beam steering system configured for steering an energy beam produced by said phased array antenna, the patch antenna element comprising: a conductive ground plane having a cavity recessed therein and defining a cavity aperture, a radiating patch backed by the cavity and arranged in the cavity aperture, wherein the radiating patch and the cavity aperture have similar symmetrical shapes, the radiating patch being centered in the cavity aperture and a feed arrangement coupled to the radiating patch at a feed point located within the patch at a predetermined distance from a center of the patch and operable to provide radio frequency energy thereto; characterized in that the patch antenna element is configured such that: (i) a dimension of the radiating patch along an E-plane defined as a plane perpendicular to the radiating patch and passing through a center of the patch and the feed point, is less than the dimension of the cavity aperture along the E-plane by a first predetermined value V1; (ii) a dimension of the radiating patch along an H-plane defined as a plane perpendicular to the E-plane and passing through the feeding point, is less than the dimension of the cavity aperture along the H-plane by a second predetermined value V2; the first and second predetermined values V1, V2 being selected to provide a predetermined asymmetrical radiation pattern of the patch antenna element enabling that the grating lobes of the phased array antenna are substantially suppressed. a conductive ground plane having a cavity recessed therein and defining a cavity aperture, a radiating patch backed by the cavity and arranged in the cavity aperture, wherein the radiating patch and the cavity aperture have similar symmetrical shapes, the radiating patch being centered in the cavity aperture and a feed arrangement coupled to the radiating patch at a feed point located within the patch at a predetermined distance from a center of the patch and operable to provide radio frequency energy thereto; characterized in that the patch antenna element is configured such that: (i) a dimension of the radiating patch along an E-plane defined as a plane perpendicular to the radiating patch and passing through a center of the patch and the feed point, is less than the dimension of the cavity aperture along the E-plane by a first predetermined value V1; (ii) a dimension of the radiating patch along an H-plane defined as a plane perpendicular to the E-plane and passing through the feeding point, is less than the dimension of the cavity aperture along the H-plane by a second predetermined value V2; (i) a dimension of the radiating patch along an E-plane defined as a plane perpendicular to the radiating patch and passing through a center of the patch and the feed point, is less than the dimension of the cavity aperture along the E-plane by a first predetermined value V1; (ii) a dimension of the radiating patch along an H-plane defined as a plane perpendicular to the E-plane and passing through the feeding point, is less than the dimension of the cavity aperture along the H-plane by a second predetermined value V2;