Abstract

In this paper, a polarization-controlled and flexible metamaterial absorber made of a set of wires etched on ultrathin teflon dielectric substrate is proposed. The simulation results showed that the proposed absorber achieved single-band absorptivity of 99.8% at 6.64 GHz for the TM (transverse magnetic) polarization wave and penta-band absorptivity of more than 99% at 11.68 GHz, 13.58 GHz, 15.48 GHz, 17.38 GHz, and 19.28 GHz for the TE (transverse electric) polarization waves. Moreover, each absorption peak had very narrow relative bandwidth and the position of penta-band absorption peaks could be adjusted by changing the length of the corresponding wire or selecting suitable substrate material according to actual requirements, because each wire can independently respond to electromagnetic (EM) waves. Furthermore, the surface current distributions corresponding to each absorption peak were studied to demonstrate the absorption mechanism. The absorption properties of the proposed structure with different bending radii and under different incident angles of the EM waves were investigated, showing good flexibility and incident angle-insensitive properties. In addition, the simulation results were confirmed by measuring a fabricated prototype. The proposed absorber may have useful applications in polarizers, sensors, bolometers, polarization detectors, etc.

Highlights

  • Metamaterials (MMs) are a kind of artificial composite material consisting of periodic unit cells smaller than the wavelength of incident electromagnetic (EM) waves

  • MM absorbers are generally designed to match the impedance of free space by tailoring the effective permittivity and permeability, the EM wave can entirely enter the absorber, and the EM power can be dissipated by dielectric losses and ohmic loss [5]

  • We propose a polarization-controlled and flexible single-/penta-band MM absorber composed of a set of wires

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Summary

Introduction

Metamaterials (MMs) are a kind of artificial composite material consisting of periodic unit cells smaller than the wavelength of incident electromagnetic (EM) waves.

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