Résumé
This paper studies the implementation of an RFID chipless sensor based on split ring resonators. It operates in the ISM band at 2.45GHz to detect a change of carbon dioxide, and a variation of temperature. The realization of this passive wireless sensor involves inkjet printing using several ink types so that a device that works can be realized from scratch in a few stages. The substrates used are flexible materials to allow for seamless integration on any object shapes. Several samples have been printed on polyimide substrate 50 mu m thick to validate the design with the help of wireless measurements. Finally, another set of samples printed on an ordinary cardboard of 550 mu m thickness is realized and measured, and the performance achieved are compared with those of the polyimide based sensors.