Abstract: A improved structure RFID includes: a substrate with an entire side of a metal conductive material; a slot antenna disposed on the metal side of the substrate; and an identification chip disposed on the substrate and electrically connected to the slot antenna. The RFID is manufactured using a simpler and cheaper method, so manufacturing costs are significantly reduced while providing low energy consumption, pollution-free, recyclability, and the RFID has high antenna gain, strong reflectivity, and high conductivity. Shield effects provided by the whole metal side of the substrate can also reduce effects to the electrical properties of the RFID caused by the target object and the environment, so the RFID is more suitable for metal objects and conductors with moisture.

Abstract: A high-directional wide-bandwidth antenna is disclosed. The high-directional wide-bandwidth antenna includes a first element, a first radiating body, a second radiating body, a third radiating body, and a fourth radiating body. The first element has a first feeding point, wherein its equivalent reactance is inductive. One end of the first radiating body is connected to the first element and the other end of the first radiating body is a coupling surface. The second radiating body has a second feeding point and is extended through the second feeding point to the coupling surface so that the energy is transferred between the first radiating body and the second radiating body through the coupling surface. The first resonant frequency is attained by the first radiating body and the second radiating body, and the second resonant frequency is attained by the third radiating body and the fourth radiating body.

Abstract: A RFID packaging material packaging method includes the steps of: providing a substrate having a conductive layer covered thereon, processing the conductive layer of the substrate to form an antenna, electrically connecting a chip to the antenna via a pad, and covering the substrate onto a product for enabling the product to provide a RFID recognition function. The invention relates also to the RFID packaging material made subject to this RFID packaging material packaging method.

Abstract: A high-directional wide-bandwidth antenna is disclosed. The high-directional wide-bandwidth antenna includes a first element, a first radiating body, a second radiating body, a third radiating body, and a fourth radiating body. The first element has a first feeding point, wherein its equivalent reactance is inductive. One end of the first radiating body is connected to the first element and the other end of the first radiating body is a coupling surface. The second radiating body has a second feeding point and is extended through the second feeding point to the coupling surface so that the energy is transferred between the first radiating body and the second radiating body through the coupling surface. The first resonant frequency is attained by the first radiating body and the second radiating body, and the second resonant frequency is attained by the third radiating body and the fourth radiating body.

Abstract: A RFID certified document preparing method includes the steps of: (1) providing a medium and printing an antenna on the medium, (2) printing document data on the medium, and (3) electrically connecting a chip to the antenna via a pad. The invention also provides a RFID certified document prepared according to this method.