The last component of the RFID tag is the packaging. The packaging can be a sliver of plastic – i.e. a card, or it can be a sticky tag which adheres to a retail product. Packaging can also be a proper housing, or… whatever. The packaging is fairly insignificant aside from holding the tag together. Packaging should not be metallic or adhered to a metallic object, as metal will block the RF radiation and prevent proper functioning of the tag.
A.3 Pushing the technical limits
RFID cards can do a lot, for sure, but despite manufacturer claims of reading distances and encryption techniques, there are fundamental laws of electromagnetics which must be obeyed. Read distance, for example, arises because of two things: the data signal and noise. The data signal needs to be “louder” than the noise or else it becomes as useful as a quiet poetry reading in a rock concert. Typically, the best way of reducing noise and boosting signal is to stand closer – hence, the read distance concerns with RF coupling. There are other techniques, however, which can enhance read distance.
FID