El-Rayes, Shaymaa, Wang, Yi, Lancaster, Michael and Shang, Xiaobang (2015) Enhancing the selectivity of frequency selective surfaces for terahertz sensing applications. In: 8th UK-Europe-China Millimetre Waves and Terahertz Technologies Workshop (UCMMT). IEEE, Cardiff, UK, pp. 35-39. ISBN 978-1-4673-7435-4 (doi:https://doi.org/10.1109/UCMMT.2015.7460586)

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Abstract

This paper introduces a new technique for enhancing the selectivity (or the quality factor, Q-factor) of frequency selective surfaces (FSS) for sensing applications. The proposed FSS functions as a free-space bandpass resonator, designed to sense the changing dielectric properties of minute amount of materials loaded on the FSS. The Q-enhancement technique is mainly based on two concepts; enhancing the field concentration in a given area and introducing transmission zeros in the FSS response. Two designs based on a modified complementary split-ring resonator (CSRR) at 300 GHz have been proposed. The first one is composed of complementary triple-split ring resonators. The splits divided the structure into arcs of different lengths. As a result, the transmission zero is obtained in the passband due to a destructive coupling. This produces a resonance Q-factor of 41. By controlling the orientation of the three splits, higher Q-factor of 84 is attainable. The second structure is designed using concentric triple-split rings. The added electromagnetic coupling between the concentric rings makes the transmission response steeper as compared with the single triple-split ring, and the quality factor increases from 41 to 90. By reducing the inter-spacing distance by three times, the Q-factor can be further increased to 256. The parameter studies of the FSS structures based on full-wave simulations have been presented.

Item Type:	Conference Proceedings
Title of Proceedings:	8th UK-Europe-China Millimetre Waves and Terahertz Technologies Workshop (UCMMT)
Additional Information:	2015 8th UK, Europe, China Millimeter Waves and THz Technology Workshop (UCMMT), 15 Sep 2015, Cardiff, UK
Uncontrolled Keywords:	terahertz sensing; frequency selective surfaces; splitring resonators; concentric split- ring resonators; Q-factor; transmission zeros
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Engineering (ENG)
Related URLs:	Organisation
Last Modified:	16 Nov 2016 16:11
URI:	http://gala.gre.ac.uk/id/eprint/13938

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