Abstract
We numerically and experimentally investigated the negative refractive
index effect in a single subwavelength magnetic “meta-atom,” a
flower-shaped metamaterial (MM) structure. In our effort to understand the
electromagnetic properties of flower-shaped structure, the third resonance
has been considered for a rather high frequency in the gigahertz range of
electromagnetic wave. It is found that the negative refractive index is a
result of the tail of electric gap and the magnetic resonance at the third-order
resonance. The effect is switched OFF by adjusting the density of flowers.
In addition, the negative refractive index behavior is accompanied by polarization
insensitivity resulting from its geometry. Finally, the electromagnetic and
the loss properties of the MM were clarified at the third-order gap.
© 2012 IEEE
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