Abstract
•A coupled rectangular split ring resonator enabled double negative (DNG) flexible metamaterial has been designed for multiband microwave applications.•A new flexible substrate having two different molecular compositions of Mg-Zn ferrite (denoted as Mg40 and Mg60) have been prepared to form metamaterial utilizing sol–gel synthesis.•A simple structure of metamaterial but provides four resonances at S-, C-, and X-bands.•The synthesized flexible substrate exhibits better performances over conventional materials.•Flexible microwave substrates, simple unique structure, small size, negative permittivity, permeability and refractive index make this metamaterial suitable for devices used in flexible microwave technology and radar and satellite communications.
Microwave flexible dielectric materials offer a new set of attractive applications for modern devices as well as for metamaterial research and technology. In this article, metamaterials with double-negative characteristics fabricated on a novel flexible dielectric substrate are presented. These novel flexible microwave substrates were prepared from Mg-Zn ferrite powder. The proposed flexible metamaterials offer double-negative (DNG) properties, polarization insensitivity, and a higher effective medium ratio (EMR) for multiple bands of application. The prepared, flexible substrates exhibit performance superior to commercial materials with tunable dielectric properties, and the proposed metamaterial structure enhances the antenna performances as well. The flexible substrates are synthesized from Mg-Zn ferrite having two different molecular compositions of Mg denoted as Mg40 and Mg60. The prepared, highly flexible, and lightweight magnesium zinc ferrites of Mg40 and Mg60 possess tunable dielectric properties with relative dielectric permittivity of 5.18 and 4.20 and dielectric loss tangents of 0.004 and 0.006, respectively. The double-negative (DNG) metamaterial behavior is observed with the fabricated flexible metamaterials at 2.92 GHz, 4.42 GHz, 7.75 GHz, and 9.84 GHz for Mg40 and 3.16 GHz, 4.71 GHz, 8.21 GHz, and 10.52 GHz for Mg60 and validated by using 3D electromagnetic Simulator CST (Computer Simulation Technology) Microwave Studio and ADS (Advanced Design System) software. Therefore, the prepared, flexible metamaterials having improved EMR, polarization insensitivity, and DNG properties on a MgZnFe2O4substrate are suitable additions to the field of the flexible microwave.