Electronic tags are also called radio frequency tags, transponders or radio frequency cards. Electronic tags are attached to the items to be identified. Each electronic tag has a unique electronic code and is a true data carrier of the radio frequency identification system.
From a technical point of view, the core of RFID is electronic tags, and readers are designed based on the performance of electronic tags. In the RFID system, the price of electronic tags is much lower than that of readers, but the number of electronic tags is large, and there are many kinds of applications. The composition, appearance and characteristics are different. Radio frequency identification technology uses electronic tags instead of barcodes to automatically identify items without contact and can automatically collect item information.
Under normal circumstances, the electronic tag consists of a tag-specific chip and a tag antenna. The chip is used to store data of items and the antenna is used to receive and transmit radio waves. The chip of the electronic tag is very small, the thickness generally does not exceed 0.35mm; the size of the antenna is generally much larger than the chip, and the shape of the antenna is related to the operating frequency and the like. The size of the packaged electronic tag can be as small as 2mm, or it can be like an ID card size, or larger.
According to different types of electronic tags and application requirements, the amount of data information that can be carried by electronic tags varies widely, ranging from a few bits to several megabits. The electronic tag communicates with the reader through electromagnetic waves. The electronic tag can be seen as a special transceiver. The electronic tag components are as follows:
(1) The electronic tag consists of a chip and an antenna, which can maintain the integrity of the information of the identified item and can transmit the information to the reader at any time. The electronic tag has a certain period of use, and no maintenance is required during the use period.
(2) The electronic tag chip has a certain storage capacity and can store related information of the identified object. The electronic tag chip demodulates and decodes the signal received by the tag, and performs various processing such as coding and modulation on the signal that the tag needs to return.
(3) The electronic tag antenna is used to collect the electromagnetic wave emitted by the reader/writer into the space, and transmits the data signal of the tag itself as an electromagnetic wave.