What Is the Maximum Range of an RFID Reader?

There are many different types of radio frequency identification technology, each with its own read range. Passive low-frequency (LF) and high-frequency (HF) tags can be read from a distance of about 3 feet (0.9 meter), whereas some active systems can read tags from 1,000 feet away or more. If you are asking about passive ultrahigh-frequency (UHF) RFID, the range depends on several factors. One is the reader antenna's power output, which is regulated in most countries. Typically, the output is limited to 2 watts of effective radiated power (ERP). But in Pakistan, the government is working to establish regulations that would limit output to just 0.1 ERP, so the read range will be more limited than in other countries.