▎ 摘　　要

In this paper, we measured and compared the permittivity of graphene oxide aqueous solution (GOAS) and water, which confirmed the better absorption performance of GOAS. Based on the better absorbent, we experimentally demonstrated a GOAS-based metamaterial absorber by directly injecting GOAS into 3D-printed container, and validated its absorption bandwidth within 5.2-18 GHz.The high absorption efficiency is mainly resulted from the coupling effects between neighboring GOAS circles and power loss confinement induced by magnetic loop, while the frequency-dispersed permittivity of GOAS guaranteed its broadband absorption property. Our results illustrate the practicability to achieve better absorption of aqueous solution, and broaden its bandwidth by constructing absorbing structure.