A Low-scattering Water-based Metasurface Array Antenna

An RCS-reducing metasurface with a hybrid mechanism is proposed. The metasurface has a water-metal composite structure, which utilizes the absorption of electromagnetic waves by water and the coupling of water and metal metasurfaces to produce two scattering reduction mechanisms: absorption and conversion. On this basis, an array antenna is obtained by exciting the metasurface, and the proposed antenna is characterized by low scattering, low profile, and directional high-gain radiation. Simulation results show that the antenna has an impedance bandwidth of 7.32–7.62GHz with an in-band gain higher than 11.36dBi. With the hybrid mechanism, the antenna achieves an RCS reduction bandwidth of more than 125%.