Broadband metamaterial absorber for low-frequency microwave absorption in the S-band and C-band

Abstract Developing high-efficiency microwave absorbers is still a big challenge in the low-frequency range, especially in S-band (2–4 GHz). We present a multi-layered structure absorber based on magnetic material with broad-band absorption in low frequency region. The multi-layered structure consist of metamaterials and magnetic coatings, which is stacked layer by layer. Benefiting from the well-designed structure and good impedance matching performance, it is possible to achieve low-frequency and broadband absorption from 2.2 to 9.5 GHz. The experimental results agree well with the simulated ones. The results may provide some valuable design guidelines for low-frequency and broadband microwave absorber.