Enhancing the selectivity of frequency selective surfaces for terahertz sensing applications

Shaymaa El-Rayes, Yi Wang, Michael J. Lancaster, Xiaobang Shang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

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.

Original languageEnglish
Title of host publication2015 8th UK, Europe, China Millimeter Waves and THz Technology Workshop, UCMMT 2015
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
ISBN (Electronic)9781467374347
DOIs
Publication statusE-pub ahead of print - 28 Apr 2016
Event8th UK, Europe, China Millimeter Waves and THz Technology Workshop, UCMMT 2015 - Cardiff, United Kingdom
Duration: 14 Sep 201515 Sep 2015

Conference

Conference8th UK, Europe, China Millimeter Waves and THz Technology Workshop, UCMMT 2015
Country/TerritoryUnited Kingdom
CityCardiff
Period14/09/1515/09/15

Keywords

  • concentric split-ring resonators
  • frequency selective surfaces
  • Q-factor
  • split-ring resonators
  • terahertz sensing
  • transmission zeros

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering
  • Instrumentation

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