Information Metasurface for Transparent Forwarding of Non- Terrestrial Networks

Information metasurfaces (IMs) have emerged as a key solution to improve the performance of non-terrestrial networks (NTNs). However, most IMs face inherent non-negligible ohmic losses from the tunable elements, which is not suitable for the transparent forwarding architecture of NTNs. To solve this problem, the amplifying and filtering information metasurface (AFIM) is proposed in this paper to enhance the in-band signal energy and filter the out-of-band signal. Additionally, it can realize a 2-bit phase control and exhibit great beam steering performance. The proposed AFIM may find potential applications for transparent forwarding of NTNs.