Abstract
A simple design of compact ultra-wideband, ultra-thin metamaterial microwave absorber has been presented. The unit cell of the proposed design is composed of diagonally placed microstrip bend' like patches printed on grounded dielectric substrate. The simulation results demonstrate the 10-dB absorption bandwidth of 7.19 GHz from 10.45 GHz to 17.64 GHz and FWHM (full width at half maximum) bandwidth of 11.43 GHz from 9.61 GHz to 21.04 GHz. The proposed design presents more than 90% absorption for a bandwidth of 1.02 GHz at wide angle of incidence up to 60 0 . The absorption mechanism has been analyzed through surface current and electromagnetic field distributions. The proposed design has been fabricated and experimentally tested for its 10-dB absorption bandwidth under different polarization and oblique angles of incidence of electromagnetic wave. The designed absorber is low profile (unit cell size is ~0.257 I» 0 at the center frequency corresponding to 10-dB absorption bandwidth), ultrathin (~I» 0 /14 thick at the center frequency) and provides a novel design of wideband absorber for many useful applications.
Highlights
The artificially engineered electromagnetic metamaterials have inspired the researchers due to their unusual, exotic properties of simultaneous negative permittivity (ε) and permeability (μ) [1]
The incident electromagnetic fields on a metamaterial absorber manipulate the effective permittivity and permeability of the structure in such a way that its input impedance becomes equal to the free space impedance
In comparison to the already presented metamaterial absorbers, the proposed structure is a wideband low profile absorber with ultrathin thickness and provides wide-angle response and it is suitable for many potential applications
Summary
Abstract— A simple design of compact ultra-wideband, ultra-thin metamaterial microwave absorber has been presented. The simulation results demonstrate the 10-dB absorption bandwidth of 7.19 GHz from 10.45 GHz to 17.64 GHz and FWHM (full width at half maximum) bandwidth of 11.43 GHz from 9.61 GHz to 21.04 GHz. The proposed design presents more than 90% absorption for a bandwidth of 1.02 GHz at wide angle of incidence up to 600. The proposed design has been fabricated and experimentally tested for its 10-dB absorption bandwidth under different polarization and oblique angles of incidence of electromagnetic wave. The designed absorber is low profile (unit cell size is ~0.257 λ0 at the center frequency corresponding to 10-dB absorption bandwidth), ultrathin (~λ0/14 thick at the center frequency) and provides a novel design of wideband absorber for many useful applications
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