Views:10 Author:Site Editor Publish Time: 2018-01-04 Origin:Site
The General Introduction of RFID Tags
Radio-frequency identification (RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. In the article, we will introduce to you in detail what RFID Tags are.
The RFID tag contains electronically stored information, it mainly includes passive RFID tags and active RFID tags. Passive RFID tags collect energy from a nearby RFID reader's interrogating radio waves. Active RFID tags have a local power source (such as a battery) and may operate hundreds of meters from the RFID reader. Unlike a barcode, the tag need not be within the line of sight of the reader, so it may be embedded in the tracked object. RFID is one method for Automatic Identification and Data Capture (AIDC).
RFID tags have been used in many industries, for example, an RFID tag attached to an automobile during production can be used to track its progress through the assembly line; RFID-tagged pharmaceuticals can be tracked through warehouses; and implanting RFID microchips in livestock and pets allows for positive identification of animals.
Since RFID tags can be attached to cash, clothing, and possessions, or implanted in animals and people, the possibility of reading personally-linked information without consent has raised serious privacy concerns. These concerns resulted in standard specifications development addressing privacy and security issues. ISO/IEC 18000 and ISO/IEC 29167 use on-chip cryptography methods for untraceability, tag and reader authentication, and over-the-air privacy. ISO/IEC 20248 specifies a digital signature data structure for RFID and barcodes providing data, source and read method authenticity. This work is done within ISO/IEC JTC 1/SC 31 Automatic identification and data capture techniques. RFID Tags can also be used in shops to expedite checkout, and to prevent theft by customers and employees.
In 2014, the world RFID market was worth US$8.89 billion, up from US$7.77 billion in 2013 and US$6.96 billion in 2012. This figure includes RFID tags, readers, and software/services for RFID cards, RFID labels, fobs and all other form factors. The market value is expected to rise to US$18.68 billion by 2026.
The RFID tag can be affixed to an object and used to track and manage inventory, assets, people, etc. For example, it can be affixed to cars, computer equipment, books, mobile phones, etc.
RFID offers advantages over manual systems or use of bar codes. The RFID tag can be read if passed near a reader, even if it is covered by the object or not visible. The tag can be read inside a case, carton, box or other container, and unlike barcodes, RFID tags can be read hundreds at a time. Bar codes can only be read one at a time using current devices.
In 2011, the cost of passive tags started at US$0.09 each; special tags, meant to be mounted on metal or withstand gamma sterilization, can go up to US$5. Active tags for tracking containers, medical assets, or monitoring environmental conditions in data centers start at US$50 and can go up over US$100 each. Battery-Assisted Passive (BAP) tags are in the US$3–10 range and also have sensor capability like temperature and humidity.
RFID can be used in a variety of applications, such as:
Electronic key for RFID based lock system
Tracking of persons and animals
Toll collection and contactless payment
Tracking of goods
Tracking and billing processes
Machine readable travel documents
Smartdust (for massively distributed sensor networks)
Airport baggage tracking logistics
Timing sporting events
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