用于室内非视距信号增强的喷墨打印异常反射超表面

《IEICE Transactions on Communications》：Inkjet-printed anomalous-reflection metasurface for indoor NLoS signal enhancement

　　This paper reports the design, fabrication, and indoor experimental evaluation of an inkjet-printed anomalous-reflection metasurface (MTS) for enhancing non-line-of-sight (NLoS) signal reception by redirecting reflections toward a designated NLoS region. A 4.85 GHz phase-gradient MTS is synthesized using a 10-state supercell and fabricated on paper with a foam spacer and an aluminum ground plane. To reliably quantify the intended MTS-reflected component in a multipath-rich indoor environment, a path-selective evaluation method is introduced by combining wideband 8 × 8 MIMO channel sounding with time-of-flight (ToF) gating and double-directional angular power spectrum (DDAPS) analysis. Compared with an identically sized aluminum reference, the MTS exhibits positive enhancement at the designed physical Rx angle for all tested distances, while the angle-delay and double-directional analyses support attribution of the measured improvement to the intended MTS-reflected component.