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Metamaterial-Based Absorber
Abstract
In this chapter, the authors discuss metamaterial absorbers. The need for active absorbers and also different types of active absorbers have been listed in detail such as switchable absorber/reflector, switchable absorber, and tunable absorbers. The recent trends and the work investigated by researchers around the globe have also been mentioned in brief, which can set a benchmark for further research in the field of metamaterial absorbers. The proposed MTM structure is made up of four-square patches. The structure was designed on an FR4 substrate measuring 11 mm by 11 mm with a thickness of 1.60 mm. Other properties of the substrate include relative permittivity of 4.4 and loss tangent of 0.019. The structure has a full ground plane to minimize transmission. The structure's primary resonance for absorber mode configuration is at 8 GHz. The simulations of the proposed structure were carried out using CST.
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