Abstract
A new architecture for designing a tuneable wideband absorber using an active frequency selective surface (AFSS) is presented. The proposed AFSS is composed of 2-D periodic array of two opposite directional anchor-shaped metal strips printed on a dielectric substrate with no metallic screen on the back side, where positive-intrinsic-negative diodes as active components are embedded between each two anchor-shaped strips. Biasing at different voltages to turn ON and OFF the diodes, AFSS structure can react as a switchable surface between transmissive and reflective states. While, the absorber consists of the designed AFSS structure and a metallic back-plane, separated by a foam spacer. By dynamically changing the bias voltage of the diodes, the impedance of the proposed absorber can be adjusted and match with the free space at its resonant frequencies. Doing this, the presented absorber is able to offer a tuneable reflectivity level of less than -10 dB over a wide frequency band from 7 to 13.1 GHz. The detailed design of a switchable transmissive/reflective surface and a tuneable wideband absorber are reported. Both the simulated and measured results have verified the proposed performances. Furthermore, a good agreement between the measurement and simulation results has been obtained.
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