Small-dimension multi-band 4G antenna applicable to ultrathin smart phone

The invention discloses a small-dimensional multi-band 4G antenna applicable to an ultrathin smart phone, and aims at providing a plane printing antenna which is small in size, easily processed, saves cost and achieves complete coverage of phone communication bands (2G/ 3G/ 4G). The antenna comprises a FR4 dielectric plate, a metal grounding plate and a radiation metal sheet set; the radiation metal sheet set, which is composed of a feed belt and a short circuit belt which is in a shape of a reversely Chinese character Shan (mountain), is directly printed on the upper surface of the dielectric plate; a rectangular gap is formed in the dielectric plate, thus a battery can be embedded into the gap to achieve ultrathin intelligent phone, and moreover, the impedance matching of the antenna is improved. The antenna has the characteristics of being convenient to process, cost saving, light in mass, and widely applicable to the technical field of ultrathin smart phones.