Encoding/decoding strategies for frequency domain chipless RFIDs employing periodic surfaces

This paper reviews the main features of chipless RFID tags realized with High-Impedance Surfaces. These tags, which comprise a periodic surface printed on top of a grounded dielectric slab, can be exploited in a number of encoding and decoding schemes. Several encoding methods have been investigated and the results are here analyzed and organized into a broad overview. In particular, the attention is devoted to the physical phenomenon at the basis of each design that is obtained by resorting to absorption, polarization conversion or polarization diversity.