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In this paper, we report a metamaterial absorber with nearly octave bandwidth in the microwave frequency. We employ resistance loaded resonance unit cells to reduce the quality factor of the resonance in the metamaterial and expand the absorption bandwidth. The proposed planar metamaterial absorber composes two slabs of print circuit board (PCB) bonded together. The upper one is a dielectric with...
This paper reports a polarization selective one-way microwave absorber based on composite metamaterial slabs. The polarization selective one-way absorber allows a linearly polarized electromagnetic wave to be absorbed along one particular incident direction and to penetrate through it along the opposite direction. For the cross-polarized wave, the direction dependent propagation properties are reversed...
Swiss rolls, consisting of a helically wound metal/dielectric laminate tape are utilized to achieve a novel ultrathin metamaterial absorber (MA) with a thickness of only about less than two percent of the incident wavelength. An intense magnetic resonance happens accompanied by strong absorption efficiency above 95% for both the TE and TM incident waves at the resonant frequency with the incidence...
We present the application of metamaterials to the manipulation of the electromagnetic (EM) wave propagation. There examples will be reported including asymmetric EM wave propagation, switchable dual band EM absorption, and polarization modulation, all of which are based on particularly designed metamaterial slabs with thickness much less than the wavelength. The examples demonstrate the significant...
In the conventional optics, the pseudo-Brewster angle (PBA) mainly depends on the permittivity of the optical materials. However, the recent development of metamaterials in the optical wavelength has put magnetic permeability on equal footing. Thus, the conventional PBA needs to be revisited to include the permeability for metamaterial applications in the optical region. By taking into account the...
In this presentation, we demonstrate an approach to manipulate electromagnetic waves with different polarizations through a controllable metamaterial absorber. The metamaterial absorber designed at 3.3 GHz is proposed by properly integrating resonant unit cells with orthogonal polarization sensitivity onto a dielectric substrate and coupling the unit cells with microwave diodes. Simulation and measurement...
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