In this study, we designed and observed an ultrabroadband absorber and bi-functional sensor based on a water-based metamaterial (MM). The cavity material of the unit cell was photosensitive resin, the internal water layer was formed by connecting two opposite cross-types and rectangles, and the bottom layer was a copper backplate. Simulation results exhibited that the absorption rate for the water-based MM was above 90% in the frequency ranges of 3.01-3.12 and 13.31-57.75 GHz. Experimental results were in good agreement with the simulation results. We observed and analyzed the distribution of ...
