You're getting warm, what are ceiling clips you ask??
What is "Near-Field" RFID-UHF?
All antennas, regardless of the frequency, generate electromagnetic fields that have both magnetic and electric components. Part of the electromagnetic field produced by an antenna is a radiating field which will propagate over long distances covering many wavelengths. This is known as the 'far field.' Examples include broadcast radio station antennas, and also cell phone antennas. At distances near the antenna, however, there exist other electromagnetic field components that decay much more quickly with distance and, as a result, are only active near the antenna. Depending on the resonant properties of the antenna and its geometric design, it is possible to design antennas (such as loop antennas or coils) which have a strong magnetic near-field component. UHF tags are now commercially available with loop antennas that can couple to this near-field. Although these 'near-field' UHF tags can only be used near the antenna (within a half-wavelength or so = 50 cm for UHF) such tags are of interest for applications which require penetration through liquids or dielectrics. There are also other tag designs which contain a 'hybrid antenna' which can operate with both the near-field and far-field components produced by the reader antenna. With few exceptions, most lower-frequency RFID tags operating at 13.56 MHz and 125 KHz are all near-field RFID systems, with the reading range roughly limited by the diameter of the reader antenna.
Got 5 red large tee-shirts in a Walmart, Target, etc shopping cart, well the store also knows "In real time" what items, sizes and colors of product you have in that shopping cart due in part to these ceiling clips...... Going to be huge!
Calm before the buying storm. Hear that train in the distance? Nobo, nobo, nobo, choo-choo, nobo, nobo, man we will be picking up steam from what I hear........
Be on the train or under it, better make a choice soon!
