What are the manufacturing processes of RFID antennas?HF Stretchy RFID Wristband

　　What are the manufacturing processes of RFID antennas?

　　The Internet of Things is regarded as the third wave of the information industry after computers and the Internet. In the process of its realization, it requires the cooperation of many high-tech technologies such as communications, sensors, RFID, and positioning. The combination of RFID, Internet, communication and other technologies can realize the tracking and information sharing of global items. Therefore, it is considered an important cornerstone for the realization of the Internet of Things and is listed as one of the top ten important technologies in the 21st century.

　　In the process of wireless communication, the antenna is an indispensable component. RFID uses radio waves to transmit information, and the generation and reception of radio waves need to be completed through an antenna. When the electronic tag enters the working area of the reader/writer antenna, the electronic tag antenna generates enough induced current to obtain energy to be activated. For the RFID system, the antenna is a vital part, and it is closely related to the performance of the system.

　　For example, in a warehouse management project, the cost of RFID antennas accounts for less than 1% of the overall cost. However, if you choose an RFID antenna with poor performance in order to blindly reduce costs or other reasons, you will easily encounter problems such as unstable reading, missed reading, cross-reading, and reading failure during the layout of the RFID antenna. In this case, not only will the cost not be reduced, but it will increase several times. Therefore, it is necessary to pay attention to RFID antennas when deploying RFID systems.

　　The three main processes of RFID antenna manufacturing

　　In order to adapt to the different requirements of RFID performance parameters in different application scenarios, various RFID antenna manufacturing processes have emerged. At present, the most commonly used RFID antenna manufacturing processes mainly include coil winding method, etching method and printing method.

　　(1) Coil winding method

　　When using the coil winding method to make an RFID tag antenna, the tag coil must be wound and fixed on a winding tool. The antenna coil is required to have a large number of turns. The coil can be either a circular ring or a rectangular ring. . This method is generally used for RFID tags with a frequency range of 125 to 134KHz. The shortcomings of using this processing method to make antennas are obvious, which can be mainly summarized as high cost, low production efficiency, and insufficient consistency of processed products.

　　(2) Etching method

　　The etching method usually uses copper or aluminum to make antennas. This method is similar in production process to the etching process of flexible printed circuit boards. The etching method can be used in mass production of electronic tags with 13.56MHz and UHF bandwidth. It has the advantages of fine circuit, low resistivity, good weather resistance, and stable signal. However, the shortcomings of this method are also obvious, such as cumbersome production procedures and low productivity.

　　(3) Printing method

　　The printed antenna is a circuit in which conductive ink is directly printed on an insulating substrate (or film) to form an antenna circuit. The main printing method has expanded from only using screen printing to offset printing, flexographic printing, gravure printing and other production methods. The printing method is suitable for mass production of 13.56MHz and RFID UHF electronic tags. It is characterized by fast production speed, but due to the large resistance of the circuit formed by conductive ink, its application range is limited to a certain extent. Due to the advancement of printed antenna technology, the cost of RFID tags has been effectively reduced, which has promoted the popularization of RFID applications.

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