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access icon free Effect of added resonators in RFID system at 13.56 MHz

© The Institution of Engineering and Technology
Received 02/06/2017, Accepted 06/02/2018, Revised 17/01/2018, Published 09/02/2018

In this study, a reader antenna including resonators is proposed to improve detection of a small moving tag in the case of tracking a radiofrequency identification (RFID) system. The near-field RFID technology is based on load modulation, the input impedance on the reader coil and the mutual inductance between the reader and tag coils are the main parameters for performing detection. They are calculated from the impedance matrix parameters. The added resonators change all the parameters of the impedance matrix consequently the input impedance and mutual inductance are also changed. In this study, analytical formulation defining the equivalent impedance matrix parameters is developed. These formulae are used to evaluate the performance of the proposed design according to the tag misalignment (lateral and angular). From the calculation and simulation results, a frequency shift in the equivalent input impedance is found. To avoid this problem, optimising the positioning of the resonators on the reader coil is performed. This study is confirmed by measures of RFID detection for a reader prototype (with and without resonators) and a small commercial tag. Both the surface and volume of detection of the small moving tag (lateral and angular misalignment) are improved by the principle of added resonators.

Inspec keywords: radiofrequency identification; coils; HF antennas; resonators; optimisation; impedance matrix

Other keywords: tag misalignment; mutual inductance; added resonator effect; small commercial tag; resonator positioning optimisation; frequency shift; RFID system tracking; reader prototype; analytical formulation; equivalent impedance matrix parameters; load modulation; equivalent input impedance; reader antenna; RFID system; small moving tag detection; radiofrequency identification system tracking; reader coil; frequency 13.56 MHz

Subjects: Algebra; Waveguide and microwave transmission line components; RFID systems; Optimisation techniques; Single antennas

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