Under normal circumstances, the application system of RFID is mainly composed of two parts: the reader and the RFID card. Among them, the reader is generally used as a computer terminal to realize the data reading, writing and storage of the RFID card. It is composed of a control unit, which consists of a high-frequency communication module and an antenna. The RFID card is a passive transponder, which is mainly composed of an integrated circuit (IC) chip and its external antenna. The RFID chip usually integrates circuits such as radio frequency front-end, logic control, memory, etc, and some even integrate the antenna, integrated together on the same chip.
Ⅰ. Know the RFID Antenna
The RFID antenna is the transponder antenna of the RFID tag, which is a communication induction antenna. The RFID electronic tag transponder is generally composed of a chip. Due to different materials and manufacturing processes, RFID tag antennas are divided into metal etched antennas, printed antennas, and copper-plated antennas.
Ⅱ. Introduction of RFID Antenna Application
In a wireless communication system, it is necessary to convert the guided wave energy from the transmitter into radio waves or convert the radio waves into guided wave energy. The device used to radiate and receive radio waves is called an RFID antenna. The modulated high-frequency current energy (or guided wave energy) generated by the transmitter is transmitted to the transmitting antenna through the feeder, and is converted into a certain polarized electromagnetic wave energy through the antenna and goes out in the desired direction. After reaching the receiving point, the receiving antenna converts the electromagnetic wave energy of a certain polarization from a specific direction in space into modulated high-frequency current energy, which is sent to the input end of the receiver through the feeder.
Ⅲ. The function of RFID antenna
The RFID antenna should have the following functions:
1. The RFID antenna should be able to convert the guided wave energy into electromagnetic wave energy as much as possible. This first requires the antenna to be a good electromagnetic open system and secondly requires that the antenna be matched to the transmitter or receiver.
2. The RFID antenna should make the electromagnetic wave as concentrated in the determined direction as possible, or accept the incoming wave in the determined direction to the maximum extent, that is, the direction has directionality.
3. The RFID antenna should be able to transmit or receive electromagnetic waves with a specified polarization, that is, the antenna has an appropriate polarization.
4. The RFID antenna should have enough working frequency bands. These four points are the most basic functions of the RFID antenna, according to which several parameters can be defined as the basis for designing and evaluating the antenna.
The system that connects the RFID antenna and the transmitter or receiver is called a feeder system. The form of the feeder is divided into wire transmission line, coaxial transmission line, waveguide or microstrip line according to the frequency.
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