Liquids sensor/detector using an EBG structure

Jun, S., Sanz-Izquierdo, Benito, Parker, Edward A. (2019) Liquids sensor/detector using an EBG structure. IEEE Transactions on Antennas and Propagation, . ISSN 0018-926X. (doi:10.1109/TAP.2019.2902663)

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This paper describes a novel procedure to detect liquids with various permittivities using an electromagnetic band gap (EBG) structure. The concept can also be used as a method to achieve antenna frequency tunability. The main sensor consists of an array of square patches on a square unit cell with a series of cuts and grooves in the dielectric material between the patches. These trenches allow for the deposition of the liquids to be detected. The variation in the dielectric characteristics of the liquids inserted produces a change in the reflected phase of the EBG. This change in phase could be detected in various ways. In this paper, a planar antenna has been placed at a short distance from the EBG structure. The changes in the phase in the surface waves produce a change in the reflection coefficient of the antenna. Butan-1-ol, propan-2-ol, ethanol and methanol have been inserted to demonstrate the tuning technique. In order to complete the experiments the reflection coefficients and the radiation patterns were measured. Good agreement has been found between simulated and measured results. The envisaged detector could be used in a laboratory or clean room where liquids may fall into the channels.

Item Type: Article
DOI/Identification number: 10.1109/TAP.2019.2902663
Uncontrolled keywords: Electromagnetic bandga, periodic structures ,liquid antenna, CPW antenna
Divisions: Faculties > Sciences > School of Engineering and Digital Arts
Depositing User: Benito Sanz-Izquierdo
Date Deposited: 10 Apr 2019 15:23 UTC
Last Modified: 17 Jun 2019 08:43 UTC
Resource URI: (The current URI for this page, for reference purposes)
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