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A broadband metamaterial screen for reflectivity attenuation is presented in this article. Three M-type barium ferrites were mixed together and used as substrate material of the screen. By replacing dielectric material with the mixed magnetic material in the substrate, the absorption bandwidth of metamaterial screen increases. The proposed screen can operate from 4.4GHz to 8.2GHz with reflectivity...
In this paper, a novel tunable reflector with gain medium was designed, fabricated and measured. By incorporating active elements into two magnetic metamaterial SRRs, gain medium with positive loss, perfect losslessness and even negative loss can be tuned to switch the function of the active reflector among a perfect absorber, a perfect reflector and a gain reflector. The reflectivity of the tunable...
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