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RFID inlays are composed of an IC (Integrated Circuit, Chip) and a Dipole antenna, to attach the antenna to the IC we commonly use a strap.
RFID inlays can be either "wet inlay" or "dry inlay" :
Wet inlays are RFID inlays that have an adhesive backing with a clear or colored topsurface of PVC, PET or paper, the PVC or PET wet inlays are commonly used to make "RFID Labels" where the inlay is placed on the back of the label with the adhesive side away from the label side so that the RFID label has continuous adhesive. Placement of the wet inlay on the label is very specific to each RFID printer in order to be programmed correctly by the printer and also to minimize the risk of damaging the RFID inlay while in the printer.
Dry inlays are RFID inlays that are attached to the substrate backing material commonly called the web.
Antennas can be made of silver, aluminum or copper, with each material producing very specific read and write characteristics because of the different chemical properties. While sometimes there are some more exotic materials used for antennas, they are considerably more expensive to produce and very vertical application specific. Generally a copper antenna is slightly more expensive than aluminum or silver, but is more conductive and usually provides a longer distance read capability.
RFID inlays come on rolls ready to package/encapsulate into finished RFID tags. Each roll contains between 5,000 and 20,000 RFID inlays and the automated equipment to make a tag must be set up for each roll type so a production run of 5,000 tags can easily be a single roll or a 1/4 of a roll.
Just as there is a very wide variety of IC's for RFID inlays, there is also a very wide variety of antennas ranging from very small - Dot, Button, Paperclips through Dog, Bone, Hammer, Crab, Radar, Satellite, Squiggle, Mini Squiggle, Torpedo, X caliber, Web and Frog sizes - each RFID inlay usually has a specific name to identify it.
The size and shape of the antenna determines the read and write distance and speed characteristics. The small sample below depicts actual HF and UHF inlays at approximately 1/2 their actual size.
Sunorient offers almost all the RFID inlays range from different sizes, we are continually updating and adding RFID products to our website. However, if there is a particular wet RFID inlay you are searching for, but cannot find, please contact us as we will likely be able to provide it for you.