What Are Passive RFID tags and how are they different from Active RFID tags?

RFID tags are used for communicating information efficiently. RFID tags fall into two categories – passive and active.

rfid tag

Passive RFID tags are transmitters of information to a corresponding reader or scanner only once they are activated with the scanner. 

They differ from active RFID tags in that they have no power source, instead of being activated by the reader. Because of this, they tend to be used for data management rather than things such as GPS tracking.  Additionally, unlike active RFID tags, passive ones do not contain a live circuit through which to continuously transmit information.

Passive RFID tags are used for a variety of applications, traditionally associated with data management. Examples of this can include, but not be limited to, inventory management, information access, or shipment logging. Inventory management can be applied in situations such as supermarkets where groceries are logged, according to their barcode, as entering the facility and, upon checkout, leaving the facility. Information access can be done through the scanning of the RFID tag and information being pulled up automatically onto a computer. Lastly, shipment logging can occur as items are shipped around the globe and scanned at specific intervals, uprating tracking information in a computer-based system. 

RFID tags come as both passive and active options. Passive tags do not automatically or continuously transmit information but rely on a scanner or reader to activate the tag’s information. Passive RFID tags are used in data management applications, including supermarket inventory, shipment logs and information access.