An antenna including a substrate formed of a non-conductive material, a ground plane disposed on the substrate, a wideband element for coupling having one end connected to an edge of the ground plane and an elongate feed arm feeding the wideband element for coupling and having a maximum width of 1/100 of a predetermined wavelength, the predetermined wavelength being defined by formula (I) wherein λp is the predetermined wavelength, f is a lowest operating frequency of the wideband element for coupling, μ is a permeability of the substrate, ∈r is a relative bulk permittivity of the substrate, W is a width of a conductive trace disposed above the substrate and H is a thickness of the substrate, wherein formula (II).