A novel reader architecture for chipless RFID tags

The design architecture of a reader for detecting dual polarized chipless RFID tags is presented. The proposed reader is based on ultra-wideband chirp signal interrogation for multi-resonator based chipless RFID tags. Here, linear chirp signal is generated to read the tag data in amplitude signatures for both polarizations. The advantage of this very low cost design using single voltage-controlled oscillator (VCO) is that, it does not require any calibration tag to decode the tag data, and can read the dual polarized tags and other tags which required measurement in both polarizations. Moreover, the former linearly polarized version of the chipless tags can also be measured using this reader.