General RFID Tag

General RFID Tag refers passive, semi-passive and active. Active RFID tags contain transmitter and battery and are bigger and more expensive than passive one-way tags. The read range of active tags is more than 30 meters, although they are limited in battery lifetime.

The integrated circuit of a semi-passive (BAP) tag gets its power from the battery. Therefore they do not use the usual 90% of incoming radio power for operation, but only about 15% of it. The reflected signal is therefore stronger than for a passive tag. BAP tags still communicate passively with the reader (by modulating the backscatter of the reader radio signal). Typically the read range is more than 20m.

Here, we mainly provide the passive RFID tags. Passive RFID tags contain no battery, and are often in the form of a shipping label. The read distance of passive tags is typically less than 10 meters. The read range of the passive tag is typically limited by the radio power from the reader required to power the tag integrated circuit.  If the circuit wakes up, the sensitivity of the RFID reader is typically sufficient to detect the response from the tag.