A Broadband Polarized Metamaterial Absorber Driven by Strong Insensitivity and Proximity Effects

Md Jasim Uddin,Syed Zahurul Islam,Mohammad Habib Ullah

doi:10.1109/access.2021.3114164

Abstract

Artificial electromagnetic metamaterial produces exotic resonance, extra ordinary characteristics not available in nature, but engineers can inherit the characteristics by controlling and manipulating their structure. This research primarily the design and realization of dual-band, polarization, and incident angle insensitive metamaterial absorber (MA) is presented. By controlling and manipulating the electromagnetic design shape, artificial structure, periodic array pattern, and dielectric layer thickness a significant way to realize high absorption. In order to achieve high absorption a new shape of an octagonal ring (OR), cross-wires (CWs), and cut-off circle (CC) artificial structure have been sensibly selected. The special characteristics of this structure produce a dual resonance and its bandwidth rises compared that of classical absorber. The proposed artificial structure operation suits the Ku-band application, but possible to enhance in $C$ -band. The numerical and experimental results display a dual-band 99.8% at 12.2 GHz and 99.9% at 15.5 GHz resonance is an excellent agreement in theory and numerical analysis. The effects of the constitutive property parameters: dielectric constant ( $\varepsilon $ ), magnetic permeability ( $\mu$ ), and negative refractive index ( $n$ ) are also investigated. The investigation of symmetric design structure shows the polarization-insensitivity and high absorption initiated even in changing the incident angle. Numerical and experimental results confirmed the destructive interference of multiple penetrations are responsible for the near-unity absorption. An excellent agreement in the absorptivity rates that touches near perfection which is prominent for solar cells, detection, and imaging applications.

Highlights

The electromagnetic (EM) wave interaction with matters has become a pioneering interest and it is given considerable attention in the design prospect, fabrication, and measurement in absorber areas retrieving from microwave to optical frequency range
We investigated the electromagnetic properties of metamaterial absorbers to extract the dielectric constant, magnetic permeability, and refractive index
The results show a nearunity perfect absorber with dual resonance due to their special shape: octagonal ring (OR), cross-wires (CWs), and cut-off circle (CC)

Summary

Introduction

The electromagnetic (EM) wave interaction with matters has become a pioneering interest and it is given considerable attention in the design prospect, fabrication, and measurement in absorber areas retrieving from microwave to optical frequency range. The design specifications vary for different applications including single-, dual-, and multi-band as well as broadband frequency performance. The significant advantages of the proposed absorber structure lie in polarization insensitivity, wide incident angle, near-perfect absorption, large bandwidth, and single to multi-band operation [7]. Xu et al [8] and Li et al [9], designed a metamaterial absorber using a different split-ring resonator feeding the patches on a substrate that is more convenient in high-frequency applications. They did not investigate the physical and dielectric properties of their device. The design is implemented in a simple planar geometry and consists of a dual metallic layer, separated by a thin

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