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Fully Metallic Flat Lens Based on Locally Twist-Symmetric Array of Complementary Split-Ring Resonators
KTH, School of Electrical Engineering and Computer Science (EECS), Electromagnetic Engineering.
Sorbonne Univ, Lab Elect & Electromagnetisme, F-75005 Paris, France..
KTH, School of Electrical Engineering and Computer Science (EECS), Electromagnetic Engineering.ORCID iD: 0000-0002-4900-4788
2019 (English)In: Symmetry, ISSN 2073-8994, E-ISSN 2073-8994, Vol. 11, no 4, article id 581Article in journal (Refereed) Published
Abstract [en]

In this article, we demonstrate how twist symmetries can be employed in the design of flat lenses. A lens design is proposed, consisting of 13 perforated metallic sheets separated by an air gap. The perforation in the metal is a two-dimensional array of complementary split-ring resonators. In this specific design, the twist symmetry is local, as it is only applied to the unit cell of the array. Moreover, the twist symmetry is an approximation, as it is only applied to part of the unit cell. First, we demonstrate that, by varying the order of twist symmetry, the phase delay experienced by a wave propagating through the array can be accurately controlled. Secondly, a lens is designed by tailoring the unit cells throughout the aperture of the lens in order to obtain the desired phase delay. Simulation and measurement results demonstrate that the lens successfully transforms a spherical wave emanating from the focal point into a plane wave at the opposite side of the lens. The demonstrated concepts find application in future wireless communication networks where fully-metallic directive antennas are desired.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 11, no 4, article id 581
Keywords [en]
twist symmetry, lens antenna, complementary split-ring resonator, complementary split ring resonator (CSRR)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-252649DOI: 10.3390/sym11040581ISI: 000467314400140Scopus ID: 2-s2.0-85065500834OAI: oai:DiVA.org:kth-252649DiVA, id: diva2:1321810
Note

QC 20190610

Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2019-06-10Bibliographically approved

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Dahlberg, OskarQuevedo-Teruel, Oscar

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