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A novel diode switchable dual band/single band metamaterial absorber

In this paper, a novel switchable dual band/single band absorber is presented. The structure consists of two resonating elements — unconnected square loop and unconnected cross. These elements are connected by appropriately biasing PIN diodes embedded on these elements. Four different switching configurations are presented for the structure to act as absorber at different frequencies. Single band or dual band operations are obtained at 3.5 GHz, 7.32 GHz, 7.7 GHz and 8.91 GHz. Since the proposed structure is fourfold symmetric, it also provides polarization independent characteristics. The prototypes of the structure for all switching configurations are fabricated and the measured results are in good agreement with the simulations.