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Triple-band polarisation-independent metamaterial absorber at mm wave frequency band

Triple-band polarisation-independent metamaterial absorber at mm wave frequency band

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The authors present a triple-band metamaterial absorber operating at mm wave frequency band. The absorber is composed of periodic unit cells, which consists of a new pattern and a ground plane, placed in two sides of a dielectric substrate made of polyimide film. To best understand the absorption mechanisms, full-wave simulation results for the electric field, surface current, and power loss distributions are presented. The experimental results, for a transverse electric-polarised normal incident wave, show three distinctive absorption peaks, at frequencies 101.25, 108.75, and 129 GHz with absorptivities of 92.5, 94.9, and 88.6%, respectively. The absorber is independent of the wave polarisation, where high absorption is achieved for a wide range of oblique angles of incidence.

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