What are the types of RFID electronic tags? What are the classifications of rfid electronic tags? Some people have such questions. In fact, RFID electronic tags are a kind of non-contact automatic identification technology. They have long service life, large reading distance, data on the tags can be encrypted, storage data capacity is large, and storage information can be freely changed. Next, RFID Paper Sticker Manufacturer shares the classification of rfid electronic tags.
1. The operating frequency of the low-frequency/high-frequency system is less than 30MHz, and the typical operating frequency is 125kHz, 225kHz, 13.56MHz (non-contact IC card - the operating frequency of the RF card). The low frequency/high frequency system operates at less than 30 MHz and the typical operating frequencies are 125 kHz, 225 kHz and 13.56 MHz. RFID systems based on these frequency points typically have corresponding international standards.
2. UHF/microwave systems typically operate at frequencies above 400 MHz, with typical operating frequencies being 915 MHz, 2450 MHz, 5800 MHz, and so on. The system is also supported by a large number of international frequency band standards. It is characterized by high cost of RFID tags and readers, large amount of data stored in tags, and long reading distance (up to several meters to ten meters). The high-speed motion performance is good, its shape is generally card-shaped, and the reading antenna and the RFID Card Reader antenna have strong directivity.
3. Active RFID tags contain batteries and usually have a long reading distance. The disadvantage is that battery life is limited (3 to 10 years) and there is no battery on the passive tag. After receiving the microwave signal from the reader (the pick-up device), it converts part of the microwave energy into direct current for its own operation, usually maintenance-free. Compared with active systems, passive systems have certain limitations in terms of reading distance and adapting the speed of movement of objects.
4. The information in the integrated curable electronic tag is generally injected into the ROM process mode when the integrated circuit is produced, and the information stored therein is unchanged; the on-line wired rewrite electronic tag generally writes the information stored in the electronic tag into the internal In the E2 storage area, a dedicated programmer or writer is required for rewriting, and it must be powered during the rewriting process; the on-site wireless rewrite electronic tag is generally applicable to active electronic tags, with specific rewriting instructions, and saved in electronic tags. The information is also located in the E2 storage area. In general, it takes much longer to rewrite the electronic tag data than it takes to read the electronic tag data. Usually, the time required for rewriting is in the order of seconds, and the reading time is in milliseconds.
5. Broadcast transmitting radio frequency identification system. The electronic tag must work in an active manner and broadcast its stored identification information in real time. The reader is equivalent to a receiver that can only receive and transmit. The disadvantage of this system is that the RFID electronic tag emits information continuously, which consumes electricity and causes electromagnetic pollution to the environment, and the security and confidentiality of the system are poor. The frequency doubling RFID system is difficult to implement.
Under normal circumstances, the reader sends an RF query signal, and the signal carrier frequency returned by the electronic tag is the frequency multiplier of the RF signal emitted by the reader. This mode of operation facilitates the reader receiving and processing echo signals. However, for passive electronic tags, the rfid electronic tag converts the received reader RF energy into a frequency-doubled echo carrier frequency, and its energy conversion efficiency is low. Higher conversion efficiency is required to increase conversion efficiency, which means higher RFID tag costs. At the same time, the system work must occupy two working frequency points, and it is generally difficult to obtain the product application license of the Radio Frequency Management Committee.
6. The realization of the reflective modulation type radio frequency identification system is mainly to solve the problem of the same frequency transmission and reception. When the system works, the reader emits a microwave query (energy) signal, and the electronic tag (passive) rectifies part of the received microwave query energy signal into DC power for the circuit operation in the rfid electronic tag, and another part of the microwave energy signal is received in the electronic tag. The saved data information is modulated (ASK) and reflected back to the reader. After receiving the reflected amplitude modulated signal, the reader extracts the identification data information saved by the electronic tag. During the operation of the system, the reader emits a microwave signal and receives the reflected amplitude modulated signal simultaneously. The signal strength reflected back is much weaker than that of the transmitted signal, so the technical difficulty in implementation is the same frequency reception.
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