Comparative strategies of exploiting the 3rd harmonic signal energy in passive RFID tags

In this paper, the harmonic signals coming from the UHF RFID chips are exploited in two different ways. In the first application, the 3rd harmonic signal is combined with an external signal from a Wi-Fi source (at 2.45 GHz) in order to improve the power conversion efficiency of the energy harvester associated to the tag. In the second method, the 3rd harmonic signal is used alone as an energy source to supply a commercial temperature sensor associated with the tag.