There is a variety of labels/tags available depending upon the industry and mode of use. RFID tags selection depends upon the use of RFID system which purely based on the frequencies of the tag/label and the reader used. RFID systems can be broken down by the frequency band within which they operate: low frequency (LF), high frequency (HF), and ultra-high frequency (UHF).
There are also two broad categories of systems—passive and active RFID. In the sections below we will explore the frequencies and types of RFID systems.
Frequency refers to the size of the radio waves used to communicate between system components. RFID systems throughout the world operate in low frequency (LF), high frequency (HF), and ultra-high frequency (UHF) bands. Radio waves behave differently at each of these frequencies and there are advantages and disadvantages associated with using each frequency band.
Low Frequency (LF) RFID
Typically LF RFID systems operate at 125 KHz, although there are some that operate at 134 KHz. This frequency band provides a short read range of 10 cm, and has slower read speed than the higher frequencies, but is not very sensitive to radio wave interference.
High-Frequency (HF) RFID
The HF band ranges from 3 to 30 MHz. Most HF RFID systems operate at 13.56 MHz with read ranges between 10 cm and 1 m. HF systems experience moderate sensitivity to interference.
Ultra-high frequency (UHF) RFID
The UHF frequency band covers the range up to 300 MHz but RFID systems comply with the UHF Gen2 standard use the 860 to 960 MHz band. RFID uses the UHF Gen2 standard and is the fastest growing segment of the RFID market. The read range of passive UHF systems can be as long as 12 m, and UHF RFID has a faster data transfer rate than LF or HF. UHF RFID is the most sensitive to interference, but many UHF product manufacturers have found ways of designing tags, antennas, and readers to keep performance high even in difficult environments. Passive UHF tags are easier and cheaper than LF and HF tags.