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In this paper, a single band switchable metamaterial absorber based on active frequency selective surface (AFSS) has been presented. The proposed design comprises of periodically arranged circular loops on which semiconductor switches (PIN diodes) are implemented. By controlling the bias voltage of the PIN diodes, the absorption frequency can be switched between two different frequency bands. Moreover,...
In this paper, an ultra-thin dual-band conformal metamaterial absorber has been presented for curved surface applications. The proposed structure consists of a periodic array of two concentric rings printed on a grounded dielectric substrate. The numerical simulation shows that two discrete reflection dips occur at 7.22 GHz (C-band) and 14.55 GHz (Ku-band) with reflectivities of −17.55 dB and −12...
This paper presents an ultra-thin dual-band polarization-insensitive metamaterial absorber for C-band applications. The proposed structure comprises of a square loop and a modified split ring resonator on the top surface of a metal grounded dielectric substrate. The designed absorber offers low profile with a thickness of λ0/56 and λ0/49at 5.4 GHz and 6.1 GHz, respectively, where λ0 is free space...
A wideband radar absorber comprising single-layer resistively loaded frequency selective surface (FSS) is presented in this paper. The FSS is printed on a thin dielectric substrate separated from the metal ground by an air spacer. Numerical result shows that the proposed absorber provides 10 dB absorption bandwidth over the frequency range of 3.96 – 13.36 GHz, which is equivalent to 108.54%. Moreover,...
In this paper, a broadband circuit analog absorber has been presented based on lumped resistors, which exhibits 10 dB absorption bandwidth from 3.96 GHz to 8.16 GHz, covering entire C-band. The designed structure is polarization-insensitive and wide-angle absorptive. The effect of the lumped resistors has been studied to examine the absorption mechanism of the wideband absorber. The structure has...
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