RFIDtagging

RFID tagging is the practice of attaching radio-frequency identification tags to objects to enable automatic identification and data capture. An RFID system consists of a tag (transponder), a reader (interrogator), and an application backend. The tag contains an antenna and a microchip that stores data and, depending on type, a power source. Passive tags harvest energy from the reader's radio waves, while active tags carry their own battery and can initiate communication. Semi-passive tags have a battery for sensors or circuitry but rely on the reader to generate communication.

Tags communicate using radio frequencies, typically in low-frequency (LF), high-frequency (HF, including NFC), ultra-high frequency (UHF), or microwave bands. Read ranges vary from a few centimeters for compact LF/HF tags to several meters for UHF and certain microwave tags. Data encoded on a tag can be a unique identifier or include product data, often leveraging standards such as ISO/IEC 14443/15693, or EPC Gen2 for UHF.

Applications include retail inventory and checkout, supply-chain visibility, asset and equipment tracking, library and museum systems, access control, and livestock tagging. Implementation requires tag selection, placement, durability, and environmental considerations (metal, liquids). Data integrity is maintained through middleware and backend databases; tags may store a small amount of data or simply a key that links to a database.

Security and privacy concerns drive measures such as encryption, authentication, read-range controls, and policy guidelines. History notes: RFID concepts date to mid-20th century, with commercial adoption accelerating in the 1990s–2000s, culminating in standardized protocols like EPC Gen2.