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In this paper, a novel broadband flexible metamaterial absorber is proposed. The unit cell of the absorber is consisted of loaded high-impedance surfaces (HIS) on a flexible polyethylene terephthalate (PET) substrate and a metallic ground plane seperated by a dielectric layer. Losses in the high-impedance surface are introduced by printing the periodic pattern through resistive inks and hence avoiding...
A novel broadband metamaterial absorber based on cross dumbbell-shaped structure and loaded lumped resisters is proposed in this paper, which consists of three metallic layers separated by two dielectric substrates. Five metallic vias connect three metallic layers. This absorber can achieve 90% absorption from 5 to 12.1 GHz under the normal incidence, equivalent to a relative absorption bandwidth...
In this paper, a broadband perfect metamaterial absorber was designed in microwave frequency band, which was based on flexible materials. The flexible materials can be used in radomes, sensing, cloaking and other microwave applications. This absorber is polarization insensitive owing to the high — degree symmetry of structure. Simulation results show that the proposed absorber has high absorption,...
In a passive ultra high frequency radio frequency identification (UHF RFID) system, the reverse link (tag to reader) transmission is realized by the backscattering approach. Traditional UHF RFID readers use the same carrier frequency for both the forward and reverse links. In this paper, a UHF RFID reader that uses different central frequencies for the forward and reverse links is presented. Since...
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