UHF and HF RFID electronic tags

UHF and HF RFID tags are different. Of course,they are different in application.
HF RFID tags operate at 13.56MHz typically. Generally ,they are passive. When the tags and data are exchanged, the tags must be located in the near-field area radiated by the RFID reader antenna.
The reading distance of HF tags is generally less than 1 meter. Because they can be made into a card shape easily.High-frequency tags are used widely in electronic tickets, electronic ID cards, electronic locking anti-theft, community property management, building access control systems, etc.
 UHF tags operate at frequencies between 860MHz and 960MHz, and can be divided into active tags and passive tags. When working, the radio frequency tag is located in the far field area of the radiation field of the UHF reader antenna.
The radiation field of the UHF reader antenna provides radio frequency energy for the passive tag and wakes up the passive tag. The reading distance of the corresponding RFID system is generally greater than 1 meter, the typical situation is 4 meters and 6 meters, and the maximum can reach more than 10 meters.
Reader antennas are generally directional antennas.Only radio frequency tags within the directional beam range of the reader antennas can be read and written.
UHF tags are used widely in automatic identification of railway vehicles and container identification due to the long reading distance and fast transmission data rate. It can also be used in highway vehicle identification and automatic toll collection systems.


Post time: Jul-20-2020