The maximum range at which an ultra-high frequency (UHF) radio frequency identification (RFID) system can read tags depends on several factors, including the power output of the RFID reader, the sensitivity of the RFID tag, and the presence of obstacles or interference in the environment.
Typically, the effective range of a UHF RFID system is around 5 to 10 meters (16 to 33 feet) for passive tags (those without a battery) and up to 100 meters (330 feet) for active tags (those with a battery). However, these ranges can vary depending on the specific system components and environmental factors.
In some cases, it is possible to extend the range of a UHF RFID system through the use of special antennas or other techniques such as increasing the reader power, using directional antennas, or reducing interference. However, these approaches may also have limitations and can affect the reliability and accuracy of the system.