https://doi.org/10.1140/epjb/e2011-20773-9
Regular Article
Broadband 3D isotropic negative-index metamaterial based on fishnet structure
Department of Electronic Science and Technology, Huazhong
University of Science and Technology, Wuhan
430074, P.R.
China
a e-mail: nieyan@mail.hust.edu.cn
Received:
20
September
2011
Received in final form:
18
November
2011
Published online:
13
February
2012
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.
Key words: Mesoscopic and Nanoscale Systems
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2012