Ultralow Scattering and Broadband Metasurface Using Phase Adjustable FSS Elements Embedded With Lumped Resistors

This letter presents a novel phase-cancellation and absorptive metasurface (PCAM) with ultralow scattering and broadband features. The PCAM is formed by two circular frequency selective surface elements with lumped resistors, which can not only reduce reflection amplitudes by transforming the incident waves into heat but also adjust reflection phase responses simultaneously. The two electromagnetic scattering mechanisms, phase cancellation and absorption, cooperate in the same band and single layer. This is the first proposed ultralow backscattering performance where the monostatic radar cross section (RCS) is reduced by more than 20 dB in 5.0–10.9 GHz. Simultaneously, an RCS reduction over 10 dB is achieved at a broad frequency band of 4.1–12.0 GHz under normal incidence. Both the analysis and measurements are demonstrated in detail. The good agreement between simulated and measured results validates the proposed PCAM.