RCS magnitude coding for chipless RFID based on depolarizing tag

An approach for coding information based on the magnitude level of the radar cross section (RCS) of depolarizing chipless tags is proposed for the first time. It is used in combination with the classical frequency coding to increase the coding capacity. The control of the magnitude is based on the polarization mismatch between the tag and the reader antenna and it is fully compatible with a recent technique allowing reliable detection in real environments. The theoretical approach is validated by measurements.