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A tag that does not contain a battery is called a passive RFID tag. A passive tag uses some of the RF energy transmitted by a reader through its antenna to power its internal circuitry. Protocols designed for use with passive tags is carefully designed to give maximum power and capabilities.

UHF Passive tags are used in logistics, warehouse operation,and many other circumstances in terms of its cost effectiveness and easier implementation.

UHF stands for Ultra High Frequency and UHF tags operate between the frequency range of 860 and 960 MHz.

RFID tags comes in a myriad of sizes and design. Since they are usually incorporated in printed paper labels or plastic enclosures, you may not notice that the items are already tagged with UHF RFID tags