Radio Frequency Identification Systems:
Rfid Glossary Terms
Glossary of Terms
Active tag: An RFID tag that has an internal power
source such as a battery.
Carrier: A Radio Frequency (RF) sine wave generated
by the reader (interrogator) to transmit energy to
the tag and retrieve data from the tag. 125 kHz and 13.56
MHz, utilize transformer-type electromagnetic coupling,
whereas 2.45GHz uses RF link between the reader and the
tag for communication.
Passive tag: An RFID tag without internal source
Reader: Also called interrogator, is a device
used to communicate with RFID tags. The reader has an antennas,
which emit radio waves. These electromagnetic waves are
picked up by the tag, and the tag sends back signals containing
Back Scatter: A method of communication between
a passive tag and a reader. The tag reflects the received
rf frequencies with modulated carrier.
Barcode: A barcode (also called bar code) is a
machine-readable representation of information in a visual
format on a surface. Barcodes normally store data in the
widths and spacings of printed parallel lines. However,
they also come in patterns of dots, concentric circles,
and hidden in images.
Radio Frequency Identification (RFID): A method
of identifying unique items using radio frequencies. Here
a reader communicates with a tag, which holds digital information
in a microchip.
Savants: Middleware that filters data from EPC
readers and pass it on to enterprise systems. Savants reside
on servers across the EPC Network and pass data to one another
and act as backbone for the network.