Radio Frequency Identification (RFID)
- Posted By
Science & Technology
20th May, 2022
After a high-level security review for the forthcoming Amarnath Yatra, the government has decided to track all pilgrims using Radio Frequency Identification (RFID) tags.
- The decision has been taken amid heightened security threats to the pilgrimage.
- Radio Frequency Identification (RFID) is a wireless tracking system that consists of tags and readers.
- Radio waves are used to communicate information/identity of objects or people to nearby readers – devices that can be hand-held or built into fixed positions like poles or buildings.
- The tags can carry encrypted information, serial numbers and short descriptions.
- There are also high-memory tags like the ones designed for use in the aviation industry.
Types of RFID tags
- Active RFIDs use their own power source, mostly batteries.
- Passive RFIDs, on the other hand, are activated through the reader using the electromagnetic energy it transmits.
- Active tags have a longer read range, around 300 ft, compared to passive tags.
How do RFIDs work?
- RFID tags use an integrated circuit and an antenna to communicate with a reader using radio waves at several different frequencies – low frequency (LF), high frequency (HF), and ultra-high frequency (UHF).
- The message sent back by the tag in form or radio waves is translated into data and analysed by the host computer system.
- Unlike Barcodes, RFIDs do not require direct line of sight to identify objects. They also have a bigger range.