About RFID
A short introduction to Radio-Frequency Identification — what it is, where it's used, and how to think about choosing the right kind of system.
What is RFID?
Radio-Frequency Identification (RFID) is the wireless use of electromagnetic fields to transfer data — for the purposes of automatically identifying and tracking tags attached to objects. The tags contain electronically stored information; some are powered by induction from the reader, some harvest energy from the interrogating radio waves, and others carry a local battery and can be read at hundreds of metres.
Unlike a barcode, an RFID tag doesn't need line of sight and can be embedded inside the object being tracked. RFID is one of several technologies grouped under Automatic Identification and Data Capture (AIDC).
Practical uses around the world
RFID underpins a remarkable breadth of everyday systems. A representative sample:
- Logistics — tracking packages and parcels; replacing or complementing barcodes
- Vehicle tolling and road-charging systems
- RFID chips in passports and identity documents
- Brand protection and anti-counterfeiting for pharmaceuticals
- Item-level tagging in apparel and footwear
- Container sealing and shipping integrity
- Animal identification — pets, livestock and research subjects
- Vehicle keys and contactless entry
- Access control, ticketing and public transport
- Sports timing and event management
Why organisations adopt RFID
Reduced distribution costs
RFID scanning requires less manual work and enables faster, more accurate identification — driving down distribution costs while supporting real-time traceability.
Higher usability
RFID is contactless and wireless. Tags don't need line of sight and remain readable at distance through challenging conditions — snow, fog, ice, dirt and dust.
On-tag data storage
Unlike many alternatives, RFID can carry product information directly on the chip — reducing dependence on back-end databases at the point of read.
Tag types — by functionality
Active
Battery-powered tags with their own transmitter. Typically UHF, with read ranges up to 100 m. Suited to large, high-value assets — rail cars, reusable containers and real-time location systems.
Passive
No battery — the tag harvests energy from the reader's signal. Cheaper, smaller and easier to manufacture. Widely deployed across supply chains, retail inventory and pharmaceutical authentication.
Battery-assisted passive (BAP)
A passive tag with an integrated battery powering the chip — leaving all reader energy available for backscatter. Improves performance without an active transmitter.
Frequency bands
Just like a radio, RFID tags and readers need to be tuned to the same frequency. Different bands behave differently — choosing the right one is the first step in any RFID project.
Low frequency (LF)
Short read range (around 10 cm) and slower data transfer, but very resilient to interference. Common in access control and livestock tagging.
High frequency (HF)
Read ranges between 10 cm and 1 m with moderate interference tolerance. Used for ticketing, payment and NFC data exchange.
Ultra-high frequency (UHF)
Passive UHF reads up to ~12 m with the fastest data rates. The fastest-growing segment of the RFID market, governed by the global EPCglobal Gen2 (ISO 18000-6C) standard.