Résumé
This paper discusses recent advances in chipless RFID technology. It describes coding methods and storage capacity in RF domain, where the information is coded on the surface of the tags (conductive portion printed on the support constitutes the tag). It extends the concept of chipless RFID to THz domain where the information is coded into the volume of the tag, i.e. in the stack of different dielectric layers. Encoding of 16 bits is explained as an example. Several examples of RF and THz tags are reported and their design and performance are carried out and discussed. Many remarkable results are obtained. Tag fabrication on paper substrate using flexographic technique is also incorporated.