Triple-band polarization-independent metamaterial absorber using destructive interference

In this paper, an ultra-thin triple-band microwave metamaterial absorber has been presented which consists of a composite tetra-arrow ring structure imprinted on grounded dielectric substrate. Full-wave simulation shows three distinct absorption peaks at 4 GHz, 6.54 GHz, and 11.15 GHz with absorptivities of 95.27%, 98.35%, and 97.96% respectively. The proposed structure is polarization-insensitive and highly absorptive for wide incidence angles under both TE and TM polarizations. The absorption mechanism of the proposed structure has been investigated by using multi-reflection interference theory. The designed absorber has been fabricated and experimental results are in good agreement with simulated responses enabling its wide applications in various technologies.