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A novel concept for RFID tag localization using a tunable near-field focused circular-phase array antenna working at 5.8 GHz is presented. It serves as the reader antenna and focuses the power into a small region, in the tag vicinity. By scanning the focal spot along one axis and monitoring the differential scattered power by a tag, its position along the axis is easily computed with good accuracy...
A bench test for differential radar cross-section (??RCS) measurement is described. The principle is to measure the power difference between the low and high modulation state of the tag and calculate the ratio with the received power. To do this, devices such as an arbitrary generator that replaces the reader, and a real-time spectrum analyser to receive and analyse the signal backscattered by the...
Measurement methodology and theoretical equations to RCS and DeltaRCS determination are recalled and the measurement uncertainties are evaluated in this paper. Even if measurement uncertainties are generally not required for RFID, it is important to understand and to be able to determine the measurement uncertainty. Currently, manufacturers and testing laboratories present some results of RFID measurements...
This communication introduces measurement results of Radar Cross Section (RCS) of UHF passive tags. The RCS theory and its relationship with the reading range of tags are explained. We studied the influence of tag support, particularly those made of wood. Finally, we found that RCS is a good parameter to determine homogeneity of multiple tags of the same industrial mass production.
The growing interest in the Radio Frequency Identification (RFID) technology is giving rise to new applications, in particular for the identification of metallic objects. This interest has initiated the development of new designs for RFID tag antenna. This paper presents a UHF miniaturized patch antenna aimed at this application. The patch antenna is fed by a balanced feed to avoid a cross-layered...
In this paper, we first describe the functionality of a passive UHF RFID system for which down link (tag to the reader) is based on amplitude shift keying (ASK). We show that modulating the load chip, will also modulate the radar cross section of the tag and so change the backscattered power. The research work is based on analytical formulation, simulation results and backscattering power measurement...
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