This article designs a novel frequency selective surface (FSS) microwavemetamaterial absorber with a fourfold rotational symmetry structure to tackle the challenges of narrow absorption bandwidth and large thickness in metamaterial absorbers. The surface of this absorber is composed of conductive paste, with its intermediate layer being a dual‐layer structure of SiO 2 and Al 2 O 3 . Simulation and optimization results demonstrate that due to the combined effects of ohmic loss and resonance loss, the metamaterial absorber achieves a reflection loss (RL) of less than −10 dB over the X and Ku bands (8–18 GHz) with a thickness/bandwidth ratio of 0.266. The measured RL of the fabricated absorber matches well with the simulation results. This FSS metamaterial absorber thus provides an effective solution for reducing the thickness and weight of radar‐absorbing materials for the X and Ku bands in the field of electromagnetic stealth.
Yang et al. (Sun,) studied this question.