Passive and semipassive RFID tags do not use a radio transmitter; instead, they use modulation of the reflected power from the tag antenna. Reflection of radio waves from an object has been a subject ...

All the calculations we've performed so far assume that a wave leaves the antenna and strikes the tag, interacting with no other objects. This kind of calculation is very sensible if the tag and ...

After barcodes were put into use more than 50 years ago, the technology revolutionized the grocery business. The technology also revolutionized nearly everything else in the supply chain and logistics ...