There are many auto-id technologies, such as bar code, RFID (Radio Frequency Identification), OCR (Optical Character Recognition), MICR(Magnetic Ink Character Recognition) and Biometrics.
RFID (Radio Frequency Identification) is a system that transmits identity code wirelessly using radio wave.
Unlike bar code, RFID does not need contact. A RFID reader can read all RFID tags within a certain range wirelessly. If you add more antennas to RFID reader, it can read hundreds of RFID tags simultaneously.
RFID tag consists of a microchip attached to a radio antenna mounted on a substrate. The chip can save as much as 2 kilobytes of information.
The typcal implementation fields of RFID includes Asset Tracking, File Tracking, Chain of Custody, Manufacture, Supply Chain Management, Retailing, Payment System, Security and Access Control.
There are two types of RFID technologies depending on radio frequency or wavelength: High Frequency (HF 13.56 MHz) and Ultra High Frequency (UHF between 858 and 960 MHz, which includes EPC gen 2).
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