RFID tag

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Related to RFID tag: passive RFID tag

RFID tag

An electronic identification device that is made up of a chip and antenna. For reusable applications, it is typically embedded in a plastic housing, and for tracking shipments, it is usually part of a "smart" packaging label.

Reusable Hard Tags

For RFID applications such as toll collection and vehicle and container tracking, the tags are used over and over for many years. Such tags are built into a plastic housing like handheld calculators and other electronic devices.

Toll Collection
This toll collection tag is an example of a reusable, "semi-passive" RFID tag. Because radio frequencies (RF) penetrate glass and plastic, the chip and antenna can be built into a rigid housing that is mounted inside the car.

Inside the Hard Tag
The largest components inside this tag are the battery (bottom right) and antenna (top middle). Also called "semi-active" tags, they augment the energy coming from the reader and do not continuously beam signals as do "active" tags.

Smart Labels

A smart label contains the RFID tag as well as printed barcodes and alphanumeric characters. The printed material can provide redundant UPC and EPC data that can be picked up by a barcode scanner or read by a warehouse employee if the RFID tag cannot be read. RFID smart labels are printed and encoded at the same time in an RFID printer.

The RFID portion of the smart label is called an "inlay" and is adhered to the back of the paper label, very often by a different manufacturer. See RFID inlay and RFID.

A Smart Label Printer
Note the copper RFID antenna on the back side of this smart label. The RFID inlays are adhered to the back of the label stock, which is sent to the customer for printing and encoding. (Image courtesy of Intermec Technologies, www.intermec.com)

The Squiggle Tag
Alien Technology was one of the first companies to make RFID tags, and its various Squiggle designs became widely used. (Image courtesy of Printronix, Inc., www.printronix.com)

It's About Antennas
The patterns in these Avery Dennison RFID inlays are the aluminum and copper antennas. The black dot is the chip. Primarily used for passive, smart labels on cartons and pallets shipped from suppliers, the various designs fulfill different applications. For example, metal cans and liquids in a carton "detune" the tags and impede backscattering. (Images courtesy of Avery Dennison Corporation, www.rfid.averydennison.com)
References in periodicals archive ?
For example, when using a spacer that is one mm thick, for communications to travel a distance of two meters or more, the RFID tag itself needs to be at least 75 mm long (one quarter the radio wavelength of approximately 300 mm).
This UHF pet RFID tag provides long reading and writing range within 1 meter to 3.
Designed to deliver optimum performance, the UHF Gen2 RFID tag can be used directly on metal and liquid environment applications with its special material, while keeping a highly accurate tracking performance.
Information is written to an RFID tag by a device called an encoder.
The antenna that reads the Passive RFID tag resembles a solar panel.
And in-mold labeling (IML) is taking a step forward by incorporating RFID tags to create "intelligent packaging.
Staff can monitor who has taken out a book, but the RFID tag inside the publication does not contain any Personal information about who is reading what, nor does it include the book's title.
Despite such progress, many hurdles remain before plastic RFID tags will show up in supermarkets or mailboxes.
RFID tags are lightweight, weather-proof and affordable, so it would be easy for Kumagai to insert a tag into the collection bag with each sample.
My objection to the VeriChip, however, is that I don't see what is gained by placing the chip in my arm as opposed to giving me a bracelet with an RFID tag, like a medical alert bracelet.
A bar code doesn't really "care" what kind of box it is on; an RFID tag does.
Meanwhile, the Department of Defense is seeking standard RFID tag policy to begin implementing the technology beginning Jan.