• Commission for Air Quality Management for Delhi-NCR has warned that commercial vehicles without RFID tags or inadequate balance in the tags, will not be allowed    entry from January 1.
• RFID is a technology behind Fastag which uses radio frequency waves to track the items and transfer the data without being in contact by reading and capturing the           information stored on a tag which is attached to the               object.
• It also uses electromagnetic fields to automatically identify and track tags attached to objects.
• An RFID system consists of a tiny radio transponder; a radio receiver and transmitter.
• A radio-frequency identification system uses tags, or labels attached to the objects to be identified.
• Two-way radio transmitter-receivers called interrogators or readers send a signal to the tag and read its response

RFID systems can be classified by the type of tag and      reader.

• A Passive Reader Active Tag (PRAT) system has a passive reader which only receives radio signals from active tags (battery operated, transmit only).
• The reception range of a PRAT system reader can be adjusted from 1–2,000 feet (0–600 m), allowing flexibility in applications such as asset protection and                       supervision.
• An Active Reader Passive Tag (ARPT) system has an active reader, which transmits interrogator signals and    also receives authentication replies from passive tags.

Usage of RFID

• In India, RFID technology is used in Fastags
• An RFID tag attached to an automobile during production can be used to track its progress through the assembly line
• RFID-tagged pharmaceuticals can be tracked through warehouses; and implanting RFID microchips in livestock and pets enables positive identification of animals.