High efficiency and ultra-wideband water-based microwave absorber using 3D printing

Ultra-wideband water -based microwave metasurface absorbers have attracted considerable interest owing to their promising applications for electromagnetic radiation prevention and stealth technology, etc. Here, we propose a high -efficiency and ultra-wideband water -based metasurface absorber, consisting of a periodically truncated cone water -filled containers made by 3D printed polylactic acid (PLA) resin, which can realize an absorption rate above 90% and a relative bandwidth of up to 154.5% in the frequency band from 6.5 GHz to 50.7 GHz. This absorber can work at a wide angle of incidence and polarization insensitivity and reveals superior thermal stability. Moreover, the proposed absorber is reconfigurable for tunable absorption by controlling the water content and type of inside liquids. The performance of the proposed structure is verified by experiment, which shows a good agreement with the simulation result. Due to the excellent features such as ultra-wideband absorption, low cost, and environmentally friendly materials, the proposed water -based metasurface absorber can be applied in the fields of electromagnetic stealth and radiation protection.