In the process of wireless communication, antennas are essential components, and RFID uses radio waves to transmit information. The generation and reception of radio waves need to be realized through antennas. When the electronic tag enters the working area of the reader/writer antenna, the electronic tag antenna will generate sufficient induced current to obtain energy and be activated.

For RFID systems, the antenna is a crucial part, which is closely related to the performance of the system.

Currently, based on differences in antenna wire materials, material structures, and manufacturing processes, RFID tag antennas can be roughly divided into the following categories: etching antennas, printed antennas, wire wound antennas, additive antennas, and ceramic antennas. The most commonly used antenna manufacturing processes are the first three.

Etching method

The etching method is also known as the etching etching method. First, a substrate carrier is covered with a layer of copper or aluminum with a thickness of about 20mm. In addition, a screen printing plate of the antenna positive image is made. The resist is printed on the surface of the copper or aluminum by screen printing, thereby protecting the underlying copper or aluminum from corrosion, while the rest is dissolved by the corrosive agent.

However, due to the use of chemical etching reactions in the etching process, there are problems such as long process flows and excessive waste water, which are prone to environmental pollution. Therefore, the industry has been striving to find better alternatives.

Printed antenna

The antenna circuit is directly printed or printed on the substrate using special conductive ink or silver paste. The more mature method is gravure printing or silk screen printing. Screen printing has saved costs to a certain extent, but its ink uses conductive silver paste with a high silver content of about 70% to obtain an antenna between 15 and 20 um, which is a thick film printing method with high costs.

Coil wound antenna

The manufacturing process of winding copper wires to produce RFID tag antennas is usually completed using an automatic wire winding machine, that is, directly coating the substrate carrier film with insulating paint, and using copper wires with low melting point baking paint as the substrate for RFID tag antennas. Finally, the wire and the substrate are mechanically fixed with adhesive, and a certain number of turns are wound according to different frequency requirements.

*This article is reproduced online, and the copyright belongs to the original author. If there are copyright issues involved, please contact me to delete it.

http://www.sz-sg.com.cn/iinf/418.html