Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/96436
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Type: Journal article
Title: Angular displacement and velocity sensors based on coplanar waveguides (CPWs) loaded with S-shaped split ring resonators (S-SRR)
Author: Naqui, J.
Coromina, J.
Karami-Horestani, A.
Fumeaux, C.
Martín, F.
Citation: Sensors, 2015; 15(5):9628-9650
Publisher: MDPI
Issue Date: 2015
ISSN: 1424-8239
1424-8220
Statement of
Responsibility: 
Jordi Naqui, Jan Coromina, Ali Karami-Horestani, Christophe Fumeaux and Ferran Martín
Abstract: In this paper, angular displacement and angular velocity sensors based on coplanar waveguide (CPW) transmission lines and S-shaped split ring resonators (S-SRRs) are presented. The sensor consists of two parts, namely a CPW and an S-SRR, both lying on parallel planes. By this means, line-to-resonator magnetic coupling arises, the coupling level being dependent on the line-to-resonator relative angular orientation. The line-to-resonator coupling level is the key parameter responsible for modulating the amplitude of the frequency response seen between the CPW ports in the vicinity of the S-SRR fundamental resonance frequency. Specifically, an amplitude notch that can be visualized in the transmission coefficient is changed by the coupling strength, and it is characterized as the sensing variable. Thus, the relative angular orientation between the two parts is measured, when the S-SRR is attached to a rotating object. It follows that the rotation angle and speed can be inferred either by measuring the frequency response of the S-SRR-loaded line, or the response amplitude at a fixed frequency in the vicinity of resonance. It is in addition shown that the angular velocity can be accurately determined from the time-domain response of a carrier time-harmonic signal tuned at the S-SRR resonance frequency. The main advantage of the proposed device is its small size directly related to the small electrical size of the S-SRR, which allows for the design of compact angular displacement and velocity sensors at low frequencies. Despite the small size of the fabricated proof-of-concept prototype (electrically small structures do not usually reject signals efficiently), it exhibits good linearity (on a logarithmic scale), sensitivity and dynamic range.
Keywords: split ring resonators; coplanar waveguide; rotation sensors; angular velocity sensors; metamaterial transmission lines
Rights: © 2015 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).
DOI: 10.3390/s150509628
Grant ID: http://purl.org/au-research/grants/arc/DP120100661
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Electrical and Electronic Engineering publications

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