(radio frequency identification tags) are basically intelligent bar codes that can communicate with a system and can be tracked.
Identify and follow each product among thousands of them. The barcodes created in 1970s has a very slow scanning process both in factory and store. Also since they are just a piece of paper, it cannot send out any information.
- They can read and write information.
- Data inside of RFID tags can be changed.
Where They are Used? :
- Automatic Garage doors (Car Tracking)
- In consumer products (To track them from manufacturing through entire supply chain.)
- Tracking living thing like human and animals
- Passing cards
Physics Behind Them:
An example of RFID tag
RFID tags take the energy they need to work from magnetic field generated by RFID reader.
(Since a magnetic field can be created with electricity, electric current can be created with a magnetic field )
RFID tags can store up to 2 kilobytes of data and are made of a microchip, antenna and, battery for the case of active and semi-passive tags.
Data stored in RFID tag’s microchip Antenna receives electromagnetic energy to power tag’s battery Sends information inside of microchip to reader
A figure shows electromagnetic waves