A three-dimensional polarization independent invisibility cloak by using multiband zero refraction metamaterials

Abstract

In this paper, we propose a zero-refractive index metamaterial (ZIM) with a simple structure, which is composed of dielectric spheres. The effective medium theory was used to invert the equivalent electromagnetic parameters of metamaterials. Metamaterials have nearly zero refractive index in the three bands of 17. GHz, respectively. Through monitoring the electric field and phase distribution at three zero frequencies, the zero refractive index characteristic is verified. Based on the proposed ZIM, a three-dimensional polarization-independent invisibility cloak within three wavebands was designed and numerically demonstrated.

Quad-Band Polarization-Insensitive Square Split-Ring Resonator (SSRR) with an Inner Jerusalem Cross Metamaterial Absorber for Ku- and K-Band Sensing Applications

“…However, at 12.62 GHz, SNG behavior is exhibited. The dispersion diagram also validates the metamaterial properties plotted by Equa- The inductance (L1, L2, L3, and L4) is generated by different elements, which are calculated by Equation (9), where the substrate length is l; and w and t are the width of the strapline and the substrate thickness, respectively, in inches.…”

“…MTM properties depend on the geometry of the unit cell structure with a stable structural composition. These extraordinary physical properties make MTMs appropriate for numerous applications, such as sensing [2,3], imaging [4], metamaterial coding [5], lensing [6], reflect arrays [7], terahertz applications [8], invisible clocks [9], antennae [10][11][12], absorbers [13], programable analog differentiators [14], etc. The perfect or near-perfect metamaterial absorber has the ability to absorb a specific frequency by preventing reflection and transmission of electromagnetic (EM) waves at a given frequency [15][16][17][18][19].…”