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UWB monopole antenna chipless RFID tags using 8-bit open circuit stub resonators

The design of a chipless ultra-wideband (UWB) radiofrequency identification (RFID) tag is presented in this paper. It consists of two microstrip-line-fed circular disc monopole antenna and eight-bit open circuit (OC) stub resonator. The proposed tag can be identified based on spectral signature (SS) that is used to encode the incident signals in the frequency range from 4 GHz to 8 GHz. The designed monopole antenna and OC stub resonators are characterized using full wave simulation programs. Complete RFID system is modeled and time domain characteristics of the pulse received at the receiver's antenna is studied. Results show that the encoded pulse exhibits different signature compared to the incident pulse that can be easily distinguished in time domain.