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Design of circularly polarized dual-band metasurface-based RFID reader antenna for warehouse and healthcare applications

Published online by Cambridge University Press:  21 April 2025

V. Bharathi Open the ORCID record for V. Bharathi [Opens in a new window] ,
Krishnamurthy Ramanujam  and
Parthasarathy Ramanujam
V. Bharathi*
Affiliation:
Department of ECE, Indian Institute of Information Technology, Tiruchirappalli, TN, India
Krishnamurthy Ramanujam
Affiliation:
Department of ECE, Indian Institute of Information Technology, Tiruchirappalli, TN, India
Parthasarathy Ramanujam
Affiliation:
Department of ECE, National Institute of Technology, Tiruchirappalli, TN, India
*
Corresponding author: V. Bharathi; Email: [email protected]
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Abstract

This article proposes a hexagonal shaped circularly polarized (CP) antenna at ultra-high frequency (UHF) for radio frequency identification (RFID) and X-band applications. Initially, the antenna operates only in X-band and to convert this CP dual-band antenna asymmetric ground plane and four electromagnetic band gap structures are employed. A metasurface consisting of two complementary metamaterial structures is positioned above the patch at a 9 mm distance to enhance the gain and impedance bandwidth in both the bands. The presented antenna whose electrical dimension 0.48 λg × 0.48 λg × 0.02 λg achieves an impedance bandwidth of 796 MHz and of 4.24 GHz in UHF–RFID and X-band spectrum, respectively. The proposed antenna achieves circular polarization and has a bandwidth of 995 MHz and 796 MHz which spans 2.28–3.28 GHz and 10.44–11.24 GHz, respectively, with a 3 dB axial ratio. In addition to these, a stable radiation characteristic with an average gain of 6 dBi at both 2.45 GHz and 11.21 GHz are achieved which makes it suitable for RFID based real time logistic warehousing applications.

Keywords

circular polarizationdual bandelectromagnetic band gap structuresmetasurfaceRFID
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 10
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Copyright
© The Author(s), 2025. Published by Cambridge University Press in association with The European Microwave Association.

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