Radio Frequency Identification (RFID): Definitions(some of the of terms used in RFID technology)A Primary list of RFID TermsIn-use Programming
The ability to write data to a tag while it is attached to its object.
ISO 18000-3
The pending standard for the air interface for RFID tags that operate at 13.56 MHz.
Licence Plate
This term generally applies to a simple RFID that has only a serial number that is associated with information in a database.
The Auto-ID Center promoted the concept as a way to simplify the tag and reduce the cost. Linear-polarized Antenna
A UHF antenna that focuses the radio energy from the reader in a narrow beam.
This increases the read distance possible and provides greater penetration through dense materials. Tags designed to be used with a linear polarized reader antenna must be aligned with the reader antenna in order to be read. Low-frequency Tags
1. From 30 kHz to 300 kHz.
Low-frequency tags typical operate at 125 kHz or 134 kHz. The main disadvantages of low-frequency tags are they have to be read from within three feet and the rate of data transfer is slow. They are less subject to interference than UHF tags. They can be read at no more than three feet and the data transfer rate is slow. This type of tag is widely used in retailing because it is relatively inexpensive. Medium-frequency Tags
Tags that operate at a frequency of 300 KHz to three MHz.
Memory
The amount of data that can be stored on the microchip in an RFID tag.
Memory Block
Memory on the microchip in an RFID tag is usually divided into sections, which can be read or written to individually.
Some blocks might be locked, so data can't be overwritten, while others are not. Microwave Tags
A term that is some time used to refer to RFID tags that operate at 5.8 GHz.
They have very high transfer rates and can be read from as far as 30 feet away, but they use a lot of power and are expensive. Some people refer to any tag that operates above about 415 MHz as a microwave tag. Misread
A condition that exists when the data retrieved by the scanner or reader in the antenna is different from the corresponding data in the tag.
Modulation
Changing the radio waves traveling between the reader and the transponder in ways that enable the transmission of information.
Waves be changed in a variety of ways that can be picked up by the reader and turned into the ones and zeroes of binary code. Waves can be made higher or lower (amplitude modulation) or shifted forward (phase modulation). The frequency can be varied (frequency modulation), or data can be contained in the duration of pulses (pulse-width modulation). Multiple access schemes
Methods of increasing the amount of data that can be transmitted wirelessly within the same frequency spectrum.
Some RFID readers use Time Division Multiple Access, or TDMA, meaning they read tags at different times to avoid interfering with one another. Multiplexer
An electronic device that allows a reader to have more than one antenna.
Each antenna scans the field in a preset order. This reduces the number of readers needed to cover a given area; such as, a dock door, and prevents the antennas from interfering with one another. Multiplexor
A device that supports multiple readers by checking each one in accordance with a scheduling scheme.
Nano Block
The term Alien Technology uses to describe its tiny microchips, which are about the width of three human hairs.
List of Radio Frequency Identification or RFID articles.If there are any numbers below, use them to see other pages in this unit.
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