Enhancing the selectivity of frequency selective surfaces for terahertz sensing applications
Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
Authors
Colleges, School and Institutes
External organisations
- University of Greenwich
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 interspacing 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.
Details
Original language | English |
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Title of host publication | 2015 8th UK, Europe, China Millimeter Waves and THz Technology Workshop, UCMMT 2015 |
Publication status | E-pub ahead of print - 28 Apr 2016 |
Event | 8th UK, Europe, China Millimeter Waves and THz Technology Workshop, UCMMT 2015 - Cardiff, United Kingdom Duration: 14 Sep 2015 → 15 Sep 2015 |
Conference
Conference | 8th UK, Europe, China Millimeter Waves and THz Technology Workshop, UCMMT 2015 |
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Country | United Kingdom |
City | Cardiff |
Period | 14/09/15 → 15/09/15 |
Keywords
- concentric split-ring resonators, frequency selective surfaces, Q-factor, split-ring resonators, terahertz sensing, transmission zeros