RFID

Radio-frequency identification (RFID) is the wireless non-contact use of radio-frequency electromagnetic fields to transfer data, for the purposes of automatically identifying and tracking tags attached to objects. The tags contain electronically stored information. Some tags are powered by and read at short ranges (a few meters) via magnetic fields (electromagnetic induction). Others use a local power source such as a battery, or else have no battery but collect energy from the interrogating EM field, and then act as a passive transponder to emit microwaves or UHF radio waves (i.e., electromagnetic radiation at high frequencies). Battery powered tags may operate at hundreds of meters. Unlike a bar code, the tag does not necessarily need to be within line of sight of the reader, and may be embedded in the tracked object.

RFID tags are used in many industries. An RFID tag attached to an auto mobile during production can be used to track its progress through the assembly line. Pharmaceuticals can be tracked through warehouses. Livestock and pets may have tags injected, allowing positive identification of the animal. On off-shore oil and gas platforms, RFID tags are worn by personnel as a safety measure, allowing them to be located 24 hours a day and to be quickly found in emergencies. Since RFID tags can be attached to clothing, possessions, or even implanted within people, the possibility of reading personally-linked information without consent has raised privacy concerns.

RFID Specifications

  • Protocols supported : EPCglobal Class 1 Gen 2;ISO 18000-6B (Fairchild and Phillips);ISO 18000-6C;Phillips v1.19
  • Frequency range : 865-867 MHz or 902-928* MHz
  • Output power Maximum : 30 dBm (26 dB for use with, WWAN connection on the CN4.)
  • 902-928* MHz
  • 865-867 MHz Maximum : 23 dBm
  • Read range (typical maximum): 457 cm (15 ft) at 30 dBm**
  • Write range (typical maximum) : 228 cm (7.5 ft) at 30 dBm**
  • Maximum output power and operating frequency varies from country to country based on the regulations

** Read and write range varies based on tag performance, reader antenna gain, reader output power, and environmental conditions.

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