Version 0.8 21/10/2004 Page 37 of 44
GLOSSARY OF RFID TERMS
(Courtesy of Association for Automatic Identification and Mobility)
Active Tags
Tags which use batteries as a partial or complete source of power. They are further
differentiated by separating them into those with replaceable batteries and those which
have the batteries inside a sealed unit or what may be termed unitized active tags.
Addressability
The ability to address bits, fields, files or other portions of the storage in a tag.
Alignment
The orientation of the tag to the reader in pitch, roll, and yaw.
Antenna
Antennas are the conductive elements which radiate, and/or receive energy in the radio
frequency spectrum, to and from the tag.
Bidirectional
Capable of operating in either of two directions which are the opposite of each other. For
example, a tag which can be read or written from either side is bi-directional.
Capacity
The number of bits or bytes that can be programmed into a tag. This may represent the
bits accessible to the user or the total number including those reserved by the
manufacturer, e.g. parity or control bits.
Capture Window/Field
Region of the scanner field in which a tag will operate.
Closed Systems
A system in which relevant data regarding the attributes of the object is stored in a
common data base, accessible via data link by referencing the individual ID code. It
usually refers to a system under the control of a single owner or authority.
Code Plate
See Tag
Controller
See Multiplexer
Electromagnetic Coupling
Systems which in use a magnetic field as a means of transferring data or power are said to
use an electromagnetic coupling.
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