An example dual-polarization antenna element comprises a radiator layer and a resonator layer. The radiator layer comprises a planar antenna radiator, the planar antenna radiator comprising a split ring, enclosing a dielectric area and having ends separated by a first dielectric gap, and two second radiator sections extending from said ends. The resonator layer comprises a center resonator superimposed with said dielectric area and two offset resonator arrangements. Each offset resonator arrangement is at least partially superimposed with one of said second radiator sections, and each offset resonator arrangement comprises at least one sub-resonator. A feed arrangement is at least partially arranged in said radiator layer or in an additional feed layer.