Circular Polarized RFID Tag Antenna Design using Characteristic Mode Analysis

Sharif, A., Ouyang, J., Yan, Y., Imran, M. A. and Abbasi, Q. H. (2019) Circular Polarized RFID Tag Antenna Design using Characteristic Mode Analysis. In: 2019 International Workshop on Antenna Technology (iWAT 2019), Miami, FL, 3-6 March 2019, ISBN 9781538682692 (doi: 10.1109/IWAT.2019.8730810)

Abstract

This paper presents a circularly polarised RFID tag antenna using characteristic mode analysis. The proposed design consists of a leaf-shaped radiator with two cross slots and shorting stubs etched on a grounded FR4 substrate. By analyzing the characteristic modes, the diagonal slots are created at suitable locations to enable modes to resonate in the required frequency band. In addition to this, edge rounding is perfumed to create modes with orthogonal current distribution for circular polarisation. Moreover, the RFID chip is placed as a capacitive coupling element at current minima to excite these orthogonal modes. Furthermore, the tag parameters are optimized to give a conjugate match with Alien H4 RFID chip in US UHF RFID band (902 – 928 MHz). The proposed tag provides a read range of 3.5 m and 5 m after mounting on low permittivity substrate and 100 x 100 mm2 metallic plate, respectively.

• Item Type: Conference Proceedings
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Imran, Professor Muhammad and Abbasi, Professor Qammer
• Authors: Sharif, A., Ouyang, J., Yan, Y., Imran, M. A., and Abbasi, Q. H.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering; College of Science and Engineering > School of Engineering > Systems Power and Energy
• ISBN: 9781538682692
• Copyright Holders: Copyright © 2019 IEEE
• First Published: Published in 2019 International Workshop on Antenna Technology (iWAT)
• Publisher Policy: Reproduced in accordance with the publisher copyright policy

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