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Superdirective dimers of coupled self-resonant split ring resonators: Analytical modelling and numerical and experimental validation.

Abstract：

:Superdirective antennas developed over the last century have received renewed interest in recent years from the development of metamaterials. These arrays of electromagnetic resonators (or meta-atoms) carrying short wavelength electro- and/or magneto-inductive waves support current distributions with very high spatial frequency as required by the classical conditions for superdirectivity. As meta-atoms can have both electric and magnetic dipole characteristics (and hence radiation properties), developing antennas exploiting these distributions can challenge conventional intuitions regarding the optimal configurations required. In this work we are reporting the development of a genuinely superdirective array using split ring resonators (SRRs). We provide a comprehensive analytical model characterizing the radiation from SRR dimers in which excitation of only one split ring leads to superdirective radiation via mutually coupled modes. Our model exploits simple circuit descriptions of coupled resonant circuits, combined with standard radiation formulae for curvilinear current distributions. Using this simple model we are able to map directivity against possible SRR locations and orientations in two dimensions and identify the unique optimal configuration which meets the requirements for superdirective emission. We validate the theoretical findings by comparison to both full wave simulations and experiments showing that our SRR dimer achieves endfire directivity very close to the maximum theoretical value.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Vallecchi A,Radkovskaya A,Li L,Faulkner G,Stevens CJ,Shamonina E

doi

10.1038/s41598-019-56988-6

subject

Has Abstract

pub_date

2020-01-14 00:00:00

pages

274

issue

1

issn

2045-2322

pii

10.1038/s41598-019-56988-6

journal_volume

10

pub_type

杂志文章

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