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In this paper, a detailed study is proposed on the properties of UHF RF identification (RFID) signals when the communication between the reader and tag is established. The main objective is to analyze the harmonics produced by the chip and radiated by the tag antenna. From experimentation, the characteristics of the nonlinearities contained in the signals(More)
With the emergence of UWB systems and, in particular, the pulsed modulations, the modeling of antennas as Linear Time Invariant (LTI) systems has been studied in the last years extensively. This approach offers the advantage of modeling the antennas in frequency domain as well as in time domain. Further, the performance in terms of dispersion is taken into(More)
This paper proposes a novel cooperative composite energy harvesting system that consists in the association of a traditional passive UHF Radio Frequency Identification (RFID) chip with an Electromagnetic Energy Harvesting Circuit (EEH-C). The objective is to exploit the i-v nonlinearity of the rectifier by applying a signal with time-varying envelope in(More)
This paper discusses the evolution of UHF RFID tags towards Augmented Tags. Such an evolution must be compliant with the huge advantages that the tags encompass, in particular full passive feature, compact size, usage flexibility and cost effectiveness. The discussed evolutions are based on the exploitation of some of the properties of the tag antennas or(More)
This paper presents a new method to evaluate the performance of passive UHF Radio Frequency Identification (RFID) tags based on the analysis of its Power Spectral Density (PSD) calculated over time observations directly in the Radio Frequency band (RF). The PSD analysis is facilitated with the manipulation of the air interface from RFID signals in order to(More)
This paper unfolds the recent concept of using harmonic signals generated by the nonlinear behavior of traditional passive UHF RF identification (RFID) chips. The harmonics generation of passive RFID chips is analyzed to highlight the influences of the matching network and the tag antenna. The proposed study relies on a theoretical model that explains the(More)