A broadband metamaterial absorber working in the X-band is designed and fabricated by 3D printing this study. This structure capable of nearly absorbing power incoming waves (more than 90%) frequency band starting from 7.1 to 13.8 GHz. based on an infinite array conductive ribbons, thickness just 0.1? for minimum (without considering ground layer). circuit model transmission line theory are use...

An ultra-thin metamaterial absorber (MMA) comprises of a split-ring-cross (SRC)-shaped resonator coupled with graphene and dielectric layer backed by metallic ground plane is presented theoretically numerically for hepta-band applications. The proposed demonstrates multiple absorption peaks at 2.33, 5.24, 7.74, 8.25, 10.05, 10.97, 12.61 THz average more than 96%. physical mechanism the analyzin...

Abstract Graphene has the capability of dynamically tuning its conductivity through gate voltage. Based on this fact, an electrically switchable wideband metamaterial absorber at low frequencies is presented and investigated in paper. Our calculated results show that absorption over 90% from 400 to 1,000 MHz with Fermi level graphene being 0 eV band can be switched by adjusting without changing...

outdoor experiments on a once-through single glazed solar air heater with perforated metal absorber plate were conducted to determine the practical effect of absorber plate porosity as well as suction air flow rate on the collector thermal efficiency and its total pressure drop. three aluminum absorber plates were made perforated by drilling circular holes with different diameter/pitch ratios i...

An extraordinary light harvesting property of a periodic nano-pyramid array is reported. It is found that the nano-pyramid array can absorb light efficiently with an average absorptivity of 0.998 over the whole visible waveband. The ultra-high absorption is independent of the incoming light on polarization state and insensitive within a broad angle range. We attribute the efficient light harves...

We compute Fourier-resolved X-ray spectra of the Seyfert 1 Markarian 766 to study the shape of the variable components contributing to the 0.3–10 keV energy spectrum and their time-scale dependence. The fractional variability spectra peak at 1–3 keV, as in other Seyfert 1 galaxies, consistent with either a constant contribution from a soft excess component below 1 keV and Compton reflection com...