Novel chipless RFID tag for conveyor belt tracking using multi-resonant dipole antenna

A novel chipless RFID transponder is presented that is both compact in size and robust in terms of performance. The transponder components have been designed and analysed using a full wave electromagnetic solver as well as with measurements using a vector network analyzer and in an anechoic chamber. The novel transponder consists of a linearly polarized UWB circular monopole antenna coupled to an orthogonally polarized novel dual multi-resonant dipole antenna. The dual multi-resonant loop antenna has a gain of over 5 dB for all resonances and creates a frequency signature in the orthogonal polarization of the interrogation signal. A 6-bit prototype transponder has been presented and the simulation results verify that the cross polar radar cross section corresponds with the return loss of the multi-resonant loop antenna.