Radio Frequency Identification (RFID)
RFID is a wireless technology that uses radio waves to automatically identify and track tags attached to objects, animals, or people. Unlike traditional barcodes, RFID does not require a direct line-of-sight to be read.
Major Components
- RFID Tags (Labels): These are attached to the object being tracked. They consist of a microchip (to store data) and an antenna (to receive and transmit signals).
- Passive Tags: Do not have their own power source; they draw power from the reader’s electromagnetic wave. (e.g., FASTag).
- Active Tags: Have their own internal battery and can transmit signals over much longer distances.
- RFID Readers: Devices that emit radio frequency waves. When a tag comes within range,
the reader captures the tag’s transmitted data and sends it to a central computer system.
Working of RFID
- Tag Components:
- A microchip stores data.
- An antenna enables transmission and reception of signals.
- Reader Function:
- RFID readers emit radio frequency waves.
- Tags within range absorb energy, get activated, and transmit stored data.
- The reader’s antenna captures the signal and passes it to a connected system for processing.
- Key Feature:
- Ability to read multiple tags simultaneously, ensuring efficiency in inventory and asset management.
Applications of RFID
- Supply Chain Management
- Enables tracking and tracing of goods.
- Improves inventory visibility and efficiency.
- Asset Tracking
- Used to monitor equipment, vehicles, or tools with RFID tags.
- Prevents loss, optimizes utilization, and streamlines maintenance.
- Access Control & Security
- Employed in entry systems for buildings and restricted zones.
- Used in passports, ID cards, and authentication systems.
Difference Between NFC and RFID
Parameter | NFC (Near Field Communication) | RFID (Radio Frequency Identification) |
Range | Very short (up to 4 cm) | Longer (up to several meters) |
Communication | Peer-to-peer or read-only | Reader-to-tag |
Power Source | Powered by initiator device | Tags powered by reader or self-powered |
Applications | Contactless payments, file transfer, smart pairing | Supply chain, asset tracking, access control |
Data Transfer | Small amounts of data | Larger data handling |
Frequency | Operates at 13.56 MHz | Works at 125 kHz, 13.56 MHz, 900 MHz, etc. |
Affordability | Cheaper readers | More expensive (long-range, bulk scanning) |
