Water-cube-based metasurface for broadband and tunable microwave absorption

Water exhibits excellent dielectric constant dispersion and high loss capacity in the microwave frequency range, making it an ideal material for broadband microwave absorbers. In this paper, a broadband water-cube-based metasurface microwave absorber (WMMA) is proposed, which is capable of regulating microwave absorption. The WMMA is comprised of the top layer of water-cube-based metasurface, the middle water absorption medium, and the bottom PMMA substrate. The impedance of the WMMA is determined by the design of the water-cube structure, resulting in a broadband and tunable microwave absorption coefficient. In the Ku band, the absorption intensity of the WMMA can cover the range from 71% to 99% by regulating h and p of the water-cube unit structure with a constant absorption coefficient over a wide frequency band. The broadband and tunable WMMA has the advantages of easy fabrication and low cost, rendering it highly promising for vast applications in the fields of electromagnetic shielding, stealth, and wireless communications.