Technology Primer- RFID

General Technology Description:

RFID (Radio-frequency Identification) has been spread out in more and more applications. A RFID system comprises two components basically – a RFID reader and a RFID tag.  The RFID reader is actually the transmitter & receiver in a RFID system, it generates the signal to drive the reader’s antenna which creates the appropriate radio wave, and the tag receives the radio wave. The receiving process can generate some energy in the tag to power itself and to transmit its information to the RFID reader, so that the reader can detect and decode the reflected signal in order to identify the tag.

The main types of RFID system include passive tag RFID, semi-passive tag RFID and active tag RFID. Passive tag type has no battery in the tag; semi-passive tag type has battery in it to power the internal circuitry during communication but is not used to generate radio waves, active tag type uses battery for their entire operation.

Implementation Options:

The main options for RFID are based on the operation frequency.

LF: 125/134.2 kHz,

HF: 13.56 MHz

UHF: 433 MHz or 865 – 956MHz

Microwave: 2.45 or 5.85 GHz

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