UWB chipless tag RFID reader design

A chipless tag RFID reader is presented for short range applications. The RFID reader is comprised of a digital section, RF section and cross-polarized reader horn antennas. The reader horn antennas are used to transmit and receive data to and from the chipless tags respectively. The chipless tags have unique spectral signatures which correspond to resonances present at different frequencies in the spectrum. Each resonance has a 1:1 correspondence with a data bit. The chiplesss tag RFID reader detects the resonances as attenuation in the magnitude and phase-jumps in the phase of the spectrum. The RFID reader operates in the UWB spectrum (between 5 and 10.7 GHz) and can successfully detect a chipless tag at close range. The tag design can be transferred easily to plastic and paper, making it suitable for mass deployment for low cost items in trillions. The RFID reader is suitable for mounting over conveyor belt systems.