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A single-sided meandered-dual-antenna structure for UHF RFID tags

Published online by Cambridge University Press:  04 April 2017

Pouria Kamalvand ,
Gaurav Kumar Pandey  and
Manoj Kumar Meshram
Pouria Kamalvand
Affiliation:
Department of Electronics Engineering, IIT(BHU), Varanasi-221005, India. Phone: +91 9450533003
Gaurav Kumar Pandey
Affiliation:
Department of Electronics Engineering, IIT(BHU), Varanasi-221005, India. Phone: +91 9450533003
Manoj Kumar Meshram*
Affiliation:
Department of Electronics Engineering, IIT(BHU), Varanasi-221005, India. Phone: +91 9450533003
*
Corresponding author: M.K. Meshram Email: mkmeshram.ece@iitbhu.ac.in
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Abstract

A meandered-dual-antenna structure is proposed for UHF radiofrequency identification (RFID) tag. It is composed of two independent antennas printed on the one side of the substrate board. One of the antennas is exclusively used for receiving and harvesting sufficient energy to the tag chip having the complex conjugate impedance of the receiving antenna. The other is for backscatter to enhance maximum differential radar cross-section with purely real input impedance, to enhancement the read range. The receiving antenna is formed by a rectangular loop and a parasitic meandered line. The rectangular loop is used as a feeding element for the meandered line. The backscattering antenna is made using a meandered dipole along with a thin rectangular strip. The input impedance of the receiving antenna is designed to be conjugate matched to the chip impedance (13.5-j110 Ω), whereas the input impedance of backscattering antenna alternatively switched to open and short circuit for modulating the backscattered field. The input impedance of receiving and backscattering antennas is measured using differential probe technique. The simulated and measured results are found in good agreement. It is also demonstrated that the read range of UHF RFID system increased considerably by using the dual-antenna structure.

Keywords

Dual antennaInput impedancePassive tagRCSRead rangeRFID
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Special Issue 7: EuCAP 2016 special issue , September 2017 , pp. 1419 - 1426
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2017 

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