This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Power Reduction In RF ID I ntroduction to RF I D- Radio F requency Identification An RFID tag is a small device that can be attached to or incorporated into a product and transmit data to a reader using radio waves. RFID tags have antennas that allow them to receive and respond to radio-frequency queries from an RFID transceiver. RFID tags come in three varieties: Active tags, Passive tags and Semi Active Tags. Active tags have built in power supply such as battery, as well as electronics to perform specialized tasks. By contrast Passive RFID tags do not have a power supply and must rely on the power emitted by an RFID reader to transmit data. Thus, if a reader is not present, the passive tag cannot communicate any data. Active RFID tags can communicate in the absence of a reader. Semi-active tags are not yet commercially available but will use a battery to run the microchip’s circuitry but not to communicate with the reader. Semi-active tags rely on capacitive coupling and carbon ink for the antennas rather than the traditional...
View Full Document
This note was uploaded on 01/27/2010 for the course EE 600 taught by Professor Aodafkdlja during the Spring '10 term at Aarhus Universitet.
- Spring '10