In this paper, a retro-directive RFID topology is proposed, in order to improve the range of passive RFID tags. The use of a paper substrate permits to obtain low-cost, flexible and easy-to-fabricate circuits. First, the single element of the retro-directive array is proposed, consisting of a dipole with an inductive loop that guarantees the desired impedance matching between the antenna and the RFID chip; then, an array of two dipoles in a Van Atta configuration is presented. The two designs were evaluated by measuring the power received by a reader, for different incidence angles of the signal; the two-element approach showed a 7 dB improvement in the radar cross section at broadside, and less degradation of the received signal level as the angle of incidence moves from the broadside direction.
|Title of host publication||2012 IEEE IInternational Conference on RFID-Technologies and Applications (RFID-TA)|
|Publication status||Published - 2012|
|Event||IEEE International Conference on RFID-Technologies and Applications (RFID-TA) / Rapidly Emerging International RFID Congress - Nice, France|
Duration: 5 Nov 2012 → 7 Nov 2012
|Conference||IEEE International Conference on RFID-Technologies and Applications (RFID-TA) / Rapidly Emerging International RFID Congress|
|Period||5/11/12 → 7/11/12|
- RETRODIRECTIVE RECTENNA