The Working Principle Of Electronic Tags

RFID radio frequency identification is a non-contact automatic identification technology, which automatically identifies the target object and obtains relevant data through radio frequency signals. The identification work does not need human intervention and can work in a variety of harsh environments. RFID technology can identify high-speed moving objects and multiple tags at the same time, so the operation is fast and convenient.

RFID tag is a breakthrough technology: "first, you can identify a single very specific object, not only one class of objects like a bar code; second, it uses radio frequency and can read data through external materials, while the bar code must rely on laser to read information; third, it can read multiple objects at the same time, and the bar code can only be read one by one. In addition, the amount of information stored is also very large. "

The basic working principle of RFID technology is not complicated: after the tag enters the magnetic field, it receives the radio frequency signal emitted by the reader, and sends out the product information stored in the chip (PassiveTag, passive tag or passive tag) by virtue of the energy obtained by the induced current, or actively sends a signal of a certain frequency (ActiveTag, active tag or active tag); the reader reads the information and decodes it, and then sends it to the central information system for data processing.

RFID (Radio Frequency Identification) system consists of two parts: read / write unit and electronic transceiver. The reader emits electromagnetic pulses through the antenna, and the transceiver receives these pulses and sends the stored information to the reader in response. In fact, this is the non-contact reading, writing or deleting of the data in the memory.

Technically, the "smart tag" contains a RFID circuit that includes a RFID chip with a RFID radio frequency portion and an ultra-thin antenna loop, which is embedded in the tag with a plastic sheet. Usually, a paper label is affixed to the label, and some important information can be clearly printed on the label. Current smart tags are generally the size of a credit card, and there are 4.5 × 4.5cm size tags for small goods, as well as circular tags with a diameter of 4.7cm on CD and DVD.

Compared with other ID technologies such as bar codes or magnetic stripes, the advantage of transceiver technology lies in the wireless link between the reader and the transceiver: the read / write unit does not require visual contact with the transceiver, so it can be fully integrated into the product. This means that transceivers are suitable for harsh environments, and transceivers are insensitive to moisture, dirt, and mechanical effects. Therefore, the transceiver system has very high reading reliability, fast data acquisition, and the last and important point is to save labor and paper.