Strong diamagnetic response in split-ring-resonator metamaterials: Numerical study and two-loop model
2008; American Physical Society; Volume: 77; Issue: 9 Linguagem: Inglês
10.1103/physrevb.77.092401
ISSN1550-235X
AutoresE. N. Economou, Thomas Koschny, Costas M. Soukoulis,
Tópico(s)Antenna Design and Analysis
ResumoWe demonstrate that there is a strong diamagnetic response of metamaterials, consisting of open or closed split-ring resonators (SRRs). Detailed numerical work shows that for densely packed SRRs, the magnetic permeability $\ensuremath{\mu}(\ensuremath{\omega})$ does not approach unity, as expected for frequencies lower and higher than the resonance frequency ${\ensuremath{\omega}}_{0}$. Below ${\ensuremath{\omega}}_{0}$, $\ensuremath{\mu}(\ensuremath{\omega})$ gives values ranging from 0.9 to 0.6 depending of the width of the metallic ring, while above ${\ensuremath{\omega}}_{0}$, $\ensuremath{\mu}(\ensuremath{\omega})$ is close to 0.5. Closed rings have $\ensuremath{\mu}\ensuremath{\approx}0.5$ over a wide frequency range independently of the width of the ring. A simple model that uses the inner and outer current loops of the SRRs can easily explain theoretically this strong diamagnetic response, which can be used in magnetic levitation.
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