Abstract
A specially designed metallic E-shaped fractal-based perfect metamaterial absorber (PMA) with fairly wideband absorptivity in the K- and Ka-bands of the microwave regime was investigated. The PMA top surface is comprised of square-shaped split-ring resonators (SRRs) surrounded with the stated fractal design. The absorptivity of PMA was analyzed in the range of 20 - 30 GHz for the normal and oblique incidence of waves. Both the transverse electric (TE) and transverse magnetic (TM) modes were taken up to observe the robustness of the proposed design. It was observed that the fractal resonators exhibit capacitive effect at low frequencies, whereas the SRRs manifest capacitive effect at higher frequencies. The simulation and measured results were found to be in fairly good agreement. It is expected that the proposed design of PMA would be useful for 5G communication applications.
Highlights
Metamaterials (MMs) are the artificially engineered mediums, wherein periodically repeated subwavelength-sized metallic or dielectric unit cells are arranged to exhibit unique and exotic electromagnetic (EM) properties [1]–[4]
We find the absorption patterns corresponding to the transverse electric (TE)- and transverse magnetic (TM)-polarized excitations overlap, thereby making the fractal metamaterial absorber (FMA) to be polarization-insensitive – the feature that is attributed to the four-fold symmetry of the unit cell in the metasurface
In the afore discussed results, we investigated the absorption characteristics of a new type of metallic E-shaped fractalbased FMA structure, which incorporates asymmetric squareshaped metallic split-ring resonators (SRRs) at the center, in the 20−30 GHz frequency span exploiting the simulation and experimental routes, and find the obtained results to be in fairly good agreement
Summary
Metamaterials (MMs) are the artificially engineered mediums, wherein periodically repeated subwavelength-sized metallic or dielectric unit cells are arranged to exhibit unique and exotic electromagnetic (EM) properties [1]–[4]. These find potentials in optical imaging [5], cloaking mediums [6], antennas [7], holography [8], ultra-sensitive sensors [9]–[12], filters [13], [14], perfect absorbers [15]–[18], etc. Such three-layer PMAs work on the phenomenon of resonance, that include the top metasurface allowing penetration by the incidence EM waves, the middle substrate traps the radiation, and the bottom layer blocks the transmission of the same
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