# Orientation independent chipless RFID tag using novel trefoil resonators

Tariq, N., Riaz, M., Shahid, H., Khan, M.J., Khan, M.S., Amin, Yasar, Loo, Jonathan ORCID: https://orcid.org/0000-0002-2197-8126 and Tenhunen, H. (2019) Orientation independent chipless RFID tag using novel trefoil resonators. IEEE Access, 7. pp. 122398-122407.

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Loo_etal_IEEE_Access_Orientation_independent_chipless_RFID_tag_using_novel_trefoil_resonators.pdf - Accepted Version

## Abstract

In this paper, a compact and fully passive bit encoding circuit, capable of operating as a chipless radio frequency identification (RFID) tag is presented. The structure consists of novel concentric trefoil-shaped slot resonators realized using Rogers RT/duroid 5880 laminate, occupying a physical footprint of 13.55 $\times$13.55 mm^2. Each resonating element is associated with a particular data bit, having a 1:1 resonator-to-bit correspondence. Bit sequences are configured through introducing modifications in the geometric structure either by addition or exclusion of each nested slot resonator. Such changes manifest directly in the electromagnetic signature of the tag as presence or absence of corresponding resonant peaks. The proposed 10-bit tag offers minimized inter-resonator mutual coupling and insensitivity to changes in polarization and incident angles thereby demonstrating orientation independent functionality. Moreover, error-free encoding is achieved through stabilizing the shift in resonant frequencies for a variety of different geometric configurations and orientation of the structure. The tag operates within the license-free ultra-wideband ranging from 5.4 to 10.4 GHz, providing spectral bit capacity and bit density of 2 bits/GHz and 5.44 bits/cm^2 respectively.

Item Type: Article 10.1109/ACCESS.2019.2937131 (c) 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Chipless tag, On-Off Keying (OOK), Radar Cross-Section (RCS), Radio Frequency Identification (RFID) Construction and engineering > Electrical and electronic engineeringComputing Jonathan Loo 15 Nov 2019 16:54 28 Aug 2021 07:11 https://repository.uwl.ac.uk/id/eprint/6407