RFID reader

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RFID reader

A transmitter/receiver that reads the contents of RFID tags in the vicinity. Also called an "RFID interrogator." The maximum distance between the reader's antenna and the tag vary, depending on application. Credit cards and ID badges have to be brought fairly close to the readers, somewhat like barcodes. For other applications, passive RFID tags can be read up to approximately 10 feet away, while active tags with batteries can be several hundred feet from the reader.

Linear vs. Circular Polarization
Linear polarized antennas transmit in a straight line, and their orientation to the RFID tags is critical. Such antennas are used for conveyer belts where tags can be adhered to the cartons in a consistent manner.

Circular polarized antennas radiate in a 90 degree pattern and are less sensitive to the tag's orientation on the package. The radio waves also move around obstructions better than linear antennas. See RFID, RFID tag, RFID printer and RFID-blocking wallet.


Close to the Reader
RFID-based credit cards, ID badges and keychain passes are designed to be brought close to the reader so that other RFID tags in the vicinity will not be accidentally detected. This RFID-based credit card uses Chase's Blink technology.








Reading Tags
RFID tags are read by stationary and handheld readers. At the top, the reader antennas are the square, yellow units on the left. The forklift in the middle has its own readers, and handheld readers like the one at the bottom are used in both retail and warehouse applications. (Images courtesy of Intermec Technologies, www.intermec.com)


Reading Tags
RFID tags are read by stationary and handheld readers. At the top, the reader antennas are the square, yellow units on the left. The forklift in the middle has its own readers, and handheld readers like the one at the bottom are used in both retail and warehouse applications. (Images courtesy of Intermec Technologies, www.intermec.com)


Reading Tags
RFID tags are read by stationary and handheld readers. At the top, the reader antennas are the square, yellow units on the left. The forklift in the middle has its own readers, and handheld readers like the one at the bottom are used in both retail and warehouse applications. (Images courtesy of Intermec Technologies, www.intermec.com)
References in periodicals archive ?
The new devices are Savi Locate(TM), which is a GPS location sensor and Savi IoT(TM), which is a hybrid active RFID interrogator (reader) and transponder (transmitter).
UHF RFID interrogator reads tags as far away as 16 feet
In the Defense Department's own words, the "Army representatives examined the device and wiring and confirm that a commercial RFID interrogator was used to 'wake up' a commercial RFID tag.
*Encoded identification of the product *Additional information about the product for inclusion on the RFID tag *Semantics and data syntax *The data protocol to be used to interface with business applications and the RFID system *The air interface standards between the RFID interrogator and RFID tag.
As a result, MTS now features an embedded GPS card and RFID interrogator in a new L-band satellite transceiver.
When the aircraft lands in Kuwait or Iraq, a fixed-site RFID interrogator reads the tag on the cargo.
The embedded RFID interrogator is the enhancement of most significance to logisticians.
Power is required for the RFID interrogator and the computer that collects the data and provides them to the in-transit visibility servers.
When a desk station won't provide the versatility needed for mass movement, hand held RFID interrogators are used to quickly read RFID Tags on weapons, ammunition and tactical gear.
The RF-ITV servers allow users to track shipments, observe activity at a specific location or site, determine the operating status of RFID interrogators, and obtain RF-ITV metrics and statistics over selected periods of time.