Backscatter Communication Using Ultrawide Bandwidth Signals for RFID Applications

RFID technology for use in real-time object identification is being rapidly adopted in several fields such as logistic, automotive, surveillance, automation systems, etc. [1]. A radiofrequency identification (RFID) system consists of readers and tags applied to objects. The reader interrogates the tags via a wireless link to obtain the data stored on them. The cheapest RFID tags with the largest commercial potential are passive or semi-passive, and the energy necessary for tag-reader communication is harvested from the reader's signal. Passive RFID tags are usually based on backscatter modulation, where the antenna reflection properties are changed according to information data [2].