Abstract
In this paper, we numerically demonstrate a broadband 3D isotropic negative index metamaterial (NIM) at microwave frequency ranges, which is composed of double periodic array metallic fishnet structure (FS) etched on the six sides of a cubic dielectric substrate. The electric and magnetic L-C resonance circuit models are constructed to demonstrate the broadband resonance properties of the proposed 3D metamaterial. The finite integration technology (FIT) simulation and standard S parameters retrieval methods are used to calculate and analyze the negative characteristics, isotropy and polarization of the 3D model. The numerical results show that the negative index bandwidth is about 7 GHz and relative bandwidth can be up nearly to 63%, the negative-index pass band is independent of the polarization of incident waves and is almost the same for different oblique incident angles. Thus, the proposed metamaterial is good candidate as a broad-band 3D isotropic NIMs.
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Cheng, Y.Z., Nie, Y. & Gong, R.Z. Broadband 3D isotropic negative-index metamaterial based on fishnet structure. Eur. Phys. J. B 85, 62 (2012). https://doi.org/10.1140/epjb/e2011-20773-9
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DOI: https://doi.org/10.1140/epjb/e2011-20773-9