Broadband metamaterial absorber with an in-band metasurface function

Metamaterials (MMs) have received wide attention due to their strong ability to control wave propagation. Here we propose a thin MM that can realize broadband absorption, as well as in-band phase-controlled reflection. It absorbs more than 90% energy of the incident circularly polarized (CP) light between 7.94-9.76 and 10.99-12.26 GHz and, meanwhile, works as a half-wave plate near 10.35 GHz. The schemes based on both natural and artificial magnetic materials have been discussed to produce the anisotropic phase. A reflection beam steering metasurface is proposed using the absorption-selective MM. The metasurface-integrated MM absorber may have important applications in aerospace technologies such as radome.