Split-ring resonator is a unit which enhances magnetic permeability and magnetic coupling for metmaterials.
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Circle cotter also known as a cotter ring or split ring is a formed wire fastener that is shaped like a circle, hence the name.
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Pendry et al. were able to show that a three-dimensional array of intersecting, thin wires could be used to create negative values of permittivity (or "ε"), and that a periodic array of copper split ring resonators could produce an effective negative magnetic permeability (or "μ").