RFID Terms
RFID Terms (English/中文）:
A
Active tag: An RFID tag that comes with a battery that is used to power the microchip circuitry and transmit a signal to a reader. Active tags can be read from 100 feet or more away, but they are expensive, more than $20 each. They are used for tracking expensive items over long ranges. For instance, the US military uses active tags to track containers of supplies arriving in ports.
Amplitude: The maximum absolute value of a periodic curve measured along its vertical axis (the height of a wave, in layman terms).
Antenna: The antenna is the conductive element that enables the tag to send and receive data. Passive tags usually have a coiled antenna that couples with the coiled antenna of the reader to form a magnetic field. The tag draws power from this field.
Anti-collision: A general term used to cover methods of preventing radio waves from one device from interfering with radio waves from another. Anti-collision algorithms are also used to read more than one tag in the same field of a reader.
Auto-ID Center: A non-profit collaboration between private companies and academia that is pioneering the development of an Internet-like infrastructure for tracking goods globally through the use of RFID tags.
Automatic Identification: Sometimes called automatic data capture. These are methods of collecting data and entering it directly into computer systems without human involvement. Technologies normally considered part of auto-ID include bar codes, biometrics, RFID and voice recognition.
B
Back scatter: A method of communication between tags and readers. RFID tags using back-scatter technology reflect back to the reader a portion of the radio waves that reach them. The reflected signal is modulated to transmit data. Tags using back scatter technology can be either passive or active, but either way, they are more expensive than tags that use inductive coupling.
Bar code: A standard method of identifying the manufacturer and product category of a particular item. The bar code was adopted in the 1970s because the bars were easier for machines to read than optical characters. Main drawbacks include not being able to identify unique items and scanners have to have line of sight to read them.
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