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We present the design of a new type of irregular metamaterial structure that can achieve ultra-wideband absorption. The structure is created using 3D-printing to create a shell and contains multiple layers of water. The structure can achieve absorption levels greater than 0.9 in the 6.8–21.0 GHz range, with a relative bandwidth of 101.93%. The absorber also works in a wide range of incidence angles with different modes and is polarization insensitive. Measurement results obtained from a microwave experiment coincide well with the simulation results. The proposed metamaterial could be broadly applied in various civilian and military products in the future. [ABSTRACT FROM AUTHOR]

In this study, a metamaterial comprising an N-type strip (NS) and a double split-ring resonator (DSRR) has been investigated, which is the first to exhibit the broadband electromagnetically induced transparency (EIT) effect and dual-band transmission-type polarization conversion under microwaves. The transmittance coefficient reaches a maximum value of 0.94 at 13.10 GHz, while the bandwidth of the transparency window is 4.96 GHz. At 9.48 GHz and 14.36 GHz, almost all the transmitted co-polarization waves are converted into cross-polarization waves at the polarization conversion ratios of 95% and 94%, respectively. The surface current distributions have been used to analyze the phenomena of EIT and transmission-type polarization conversion. The group delay value (15.35 ps) is calculated to exhibit the slow light effect at the transparency peak. It is expected that the proposed metamaterial will be beneficial for manufacturing slow-light devices and for communication applications. [ABSTRACT FROM AUTHOR]