Multifunctional metasurface integrating tunable microwave absorption and energy harvesting

In this paper, a multifunctional composite metasurface, whose height can be adjusted by vibration, is proposed to achieve adjustable microwave absorption band performance and energy harvesting function. The metasurface is composed of indium tin oxide (ITO) conductive glass, organic glass, and 1-ethyl-3-methylimidazolium dicyanamide [EMIm][N(CN)2] ionic liquid droplets. Research indicates that the height of the metasurface significantly affects the bandwidth of microwave signal absorption, with different heights leading to changes in the frequency range of the absorption bandwidth. This adjustable height feature allows the metasurface to adapt to microwave signals of various frequencies. The microwave absorption performance and energy harvesting function are verified by experiments. The experiments are in good agreement with the simulations, and the excellent microwave absorption and energy harvesting capabilities are confirmed. This study provides a new idea and method for further research in the field of microwave absorption and energy harvesting.