Abstract
Future advanced radio-frequency identification (RFID) systems are expected to provide both identification and high-definition localization of objects with improved reliability and security while maintaining low power consumption and cost. Ultrawide bandwidth (UWB) technology is a promising solution for next generation RFID systems to overcome most of the limitations of current narrow bandwidth RFID technology, such as reduced area coverage, insufficient ranging resolution for accurate localization, sensitivity to interference, and scarce multiple access capability. In this article, the UWB technology is applied to passive RFID relying on backscatter modulation. A signaling structure with clutter and interference suppression capability is proposed and analyzed. The potential performance is investigated in terms of range/data rate trade-off, clutter suppression, and multiple access capability using experimental data obtained in both the controlled and realistic environments.
Highlights
Radio-frequency identification (RFID) technology for use in real-time object identification is facing rapid adoption in several fields, such as logistic, automotive, surveillance, automation systems, etc. [1]
∀k and δ(k) ≠ 0, orthogonal codes, such as Hadamard codes, represent a good choice [43] and ξm = 0. This could be the situation where a wake up signal is sent by the reader to switch the tag on and reset the code phase. Such a solution is under investigation in [27], where the Ultrawide bandwidth (UWB) tag is supposed to be woken up by a dedicated control signal sent in the ultra-high frequency (UHF) band
Numerical Results In order to evaluate the performance of the proposed passive UWB RFID communication system, the following parameter values have been considered: Tf = 100 ns, F = 4 dB, and effective radiated isotropic power (EIRP) EIRP = -6.7 dBm
Summary
Radio-frequency identification (RFID) technology for use in real-time object identification is facing rapid adoption in several fields, such as logistic, automotive, surveillance, automation systems, etc. [1]. It is expected that the clutter and the antenna structural mode scattering have a significant impact at the reader’s antenna, making the detection of the antenna mode-scattered signal (which carries data) a main issue in passive UWB RFID systems The data collected enable the performance characterization in close-to-reality conditions In both scenarios, the backscattering signals from an UWB antenna were measured in the frequency domain by means of a vector network analyzer in the 2-12 GHz band with steps of 5 MHz. Two Horn Lindgren 3117 antennas were employed as reference antennas.
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