A broad-band three-dimensional isotropic left-handed metamaterial

Abstract

A broad-band three-dimensional (3D) isotropic left-handed metamaterial (LHM) is proposed in this paper. The 3D unit cell is composed of a dielectric cube with metallic Jerusalem crosses on all its six sides. A theoretical model was set up by using equivalent-circuit theory. The magnetic and electric resonant frequencies of the proposed LHM are always equal, which guarantees the existence of a left-handed band. Numerical simulations were carried out to verify the proposed LHM. The results show that the relative bandwidth reaches up to 44.6%; the left-handed band is independent of the polarization of incident waves and is almost the same for different incident angles. Thus, the proposed LHM is a good candidate as a broad-band 3D isotropic LHM.

Wave propagation retrieval method for metamaterials: Unambiguous restoration of effective parameters

“…5͑b͔͒ come out from intensive dipole resonances of split cubes and failure of the effective homogeneity approach. 17 Recently Wang et al 18 has reported a three-dimensional MTM design for the microwave region claiming isotropic broadband left handedness. Design consists of Jerusalem crosses arranged in a cubic lattice ͑see inset in Fig.…”

“…All the design parameters were taken the same as in Ref. 18. To our surprise WPRM shows no any negative refractive index in the specified region ͑around 6GHz͒ ͓Fig.…”

“…19 Small and smooth imaginary part corresponds to smooth changes in the real part in contrary to sudden abrupt jumps presented. 18 This is an important message concerning WPRM functionality to avoid errors and misunderstanding in the refractive index restoration and interpretation.…”

3D broadband isotropic NRI metamaterial based on metallic cross-pairs

“…The other is based on the bulk medium, which is composed of symmetric multi-gap SRRs and crossing wires [7], an array of wired metallic spheres arranged in the face-centered cubic lattice configuration [8], identical metallic Jerusalem cross-etched on all the six sides of the cubic unit cell [9] or SRRs and wires constructed in three orthogonal planes [10]. In conclusion, these structures can permit isotropy and are polarization-independent.…”

Multi-band metamaterial absorber made of multi-gap SRRs structure

“…MM absorbers are available in the microwave region [7], THz region [8,9], infrared [10], and visible frequencies [11]. Now, the research into MM absorber has shown a trend into the multi-band [12,13], wide bandwidth [14,15], and tunable direction [16]. The perfect performance of a multiband MM absorber had been presented in [12], in which the structure is composed of six-closed rings distributed in two metallic layers.…”