An RFID antenna has a flexible single-sided substrate including a first end, a second end and a leading-out terminal. A plurality of parallel conductors are provided on the substrate and extend between the first end and the second end of the substrate. One of the multiple conductors is broken at the leading-out terminal and extends to an end of the leading-out terminal to form a connection terminal. A flexible covering layer is attached to the substrate and covers the conductors. Ends of the conductors on the first end of the substrate are respectively connected to ends of the conductors on the second end of the substrate to form a helical RFID coil.