What is the difference between high and ultra-high frequencies?
RFID systems use many different frequencies, but generally the most common are high- (13.56 MHz) and ultra-high frequency, or UHF (902-928 MHz). RFID tags and readers have to be tuned to the same frequency to communicate. Different frequencies have different characteristics that make them more useful for different applications. For instance, low-frequency tags are cheaper than ultra high frequency (UHF) tags, use less power and are used in close range scanning. UHF frequencies typically offer better range and can transfer data faster.
