Dipole antenna and radio frequency identification devices (RFID) tag and radio frequency identification devices (RFID) system with same

The invention relates to a dipole antenna, comprising an antenna body and two bridges connecting the antenna body and an integrated circuit; the antenna body comprises an inner ring and an outer ring; the inner ring at one side of the antenna body extends from periphery of surface of the integrated circuit enclosed by one of the two bridges to opposite ends of the two bridges corresponding to theintegrated circuit and then turns back at the same way to form the outer ring of the antenna body; the outer ring of the antenna body encloses the periphery of the surface of the integrated circuit and extends to the opposite ends of the two bridges corresponding to the integrated circuit, encloses inwardly the periphery of the surface of the integrated circuit and turns back at the same way to form the inner ring at the other end of the antenna body which is connected with the other bridge; the outer ring of the antenna body is provided with at least one section of curved part. The inventionalso discloses a radio fre