Frequency signature based chipless RFID tag using shorted stub resonators

A chipless RFID tag using shorted stub resonators is discussed in this paper. The tag has a data capacity of 8 bits. The tag identity can be encoded in the spectral domain either using absence/presence encoding technique or Frequency Shift coding technique. Bistatic detection approach is used to decode the tag identity from either the amplitude or group delay information. The tag comprises two cross polarized transmitting and receiving wide band monopole antennas connected to shorted stub resonators. The prototype of the tag is fabricated on a substrate C-MET/LK4.3 of dielectric constant 4.3 and loss tangent 0.0018. Measurement results on realized prototypes are provided to ensure the reliability of the proposed design.