RFID design RFID Card Production

　　Radio Frequency of Identificatio (RFID) is a non-contact automatic identification technology that uses radio frequency technology. It has the advantages of fast transmission rate, anti-collision, mass reading, and movement process reading. Therefore, RFID technology is used in logistics and Supply chain management, production management and control, anti-counterfeiting and security control, traffic management and control and other fields have significant application potential. At present, the working frequency band of radio frequency identification technology includes low frequency, high frequency, ultra high frequency and microwave range, among which high frequency and ultra high frequency are the most widely used.

　　The RFID system is mainly composed of a reader (target), a transponder (RFID tag) and a background computer. Among them, the reader implements the reading and writing and storage of data on the tag. It is composed of a control unit, a high-frequency communication module and an antenna. It is mainly composed of an integrated circuit chip and an external antenna. The circuit chip usually includes circuits such as radio frequency front-end, logic control, and memory. According to the power supply principle, tags can be divided into active (acTIve) tags, semi-active (semiacTIve) tags and passive tags. Passive tags are popular because of their low cost and small size.

　　The basic working principle of the RFID system is: after the tag enters the reader to transmit the radio frequency field, the induced current obtained by the antenna is used as the power supply of the chip after the booster circuit, and the induced current with information is converted into a digital signal through the radio frequency front-end circuit. Enter the logic control circuit for processing, and the information that needs to be replied is sent from the tag memory, sent back to the RF front-end circuit via the logic control circuit, and finally sent back to the reader through the antenna.

　　The goal of the antenna is to transmit the maximum energy in and out of the tag chip. This requires careful design of the matching between the antenna and the free space and the tag chip connected to it. When the operating frequency increases to the microwave area, the matching problem between the antenna and the tag chip becomes It's more severe. For a long time, the development of tag antennas is based on 50 or 75 ohm input impedance. In RFID applications, the input impedance of the chip may be any value, and it is difficult to accurately test under working conditions, lack of accurate parameters, and antenna design. It is difficult to achieve the best.

　　In recent years, the application of RFID technology has become more widespread, and it has also received much attention. Especially the UHF frequency band RFID system, due to its long transmission distance and high transmission rate, has received more attention. A typical RFID system consists of two parts: an RFID reader and a tag. RFID passive tags rely on electromagnetic signals emitted by the RFID reader to supply power, and communicate with the reader through reflection-modulated electromagnetic signals. Therefore, the pros and cons of the RFID tag antenna design have a key impact on the performance of the system.

　　Common RFID reader antennas include folded dipole antennas, fractal antennas, microstrip antennas and axial mode helical antennas. Since folded dipole antennas and fractal antennas are generally linear polarized antennas, it is difficult to meet the reader's identification requirements for electronic tags in various directions, so they are not suitable for many occasions; and microstrip antennas are used in miniaturized due to their large area and size. The use of reader handsets is restricted; the axial mode helical antenna is also restricted in actual use due to the high axial height. Therefore, how to design a small-size, low-profile, high-performance circularly polarized radio frequency identification antenna has become the focus of attention. (How to make a shortwave antenna)

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