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• The addition of magnetic materials broadens the effective absorption bandwidth. • Synergy between dielectric and magnetic losses strengthens microwave absorption. • The composite structure design improves the wave absorption performance. • 3 mm CSMMA has an effective absorption bandwidth of 11.53 GHz. The requirements for electromagnetic wave absorbing materials are increasing as modern technology advances. However, traditional absorbing materials have limitations due to their thickness and incompatibility with high and low frequencies, and metamaterial absorbers have limitations due to their narrow effective absorption bandwidth. This paper overcomes these problems and designs and prepares a broadband, thin and light metamaterial absorber. The effective absorption bandwidth of the composite structure metamaterial absorber (CSMMA) with a thickness d 1 of 3 mm reaches 11.55 GHz with the addition of FeSiBPCuY 5 p/paraffin magnetic composite into the metamaterial absorber and the optimization of the structural parameters. The composite structure design greatly improves the absorption performance of the metamaterial absorber. The advantages of the tunable frequency absorption characteristics of the metamaterial absorber and the high-frequency broadband absorption performance of the magnetic wave absorbing materials are fully exploited in the design of the absorber. Which is of great significance for the development of broadband and thin-absorbing materials. This absorber can be adapted to meet the needs of practical applications by adjusting its structural design, expanding its range of applications and having a substantial influence on the use of wave absorbing materials. [ABSTRACT FROM AUTHOR]

• The absorber with special structure design not only overcomes the problem of narrow absorption band of metamaterials, but also solves the shortcoming of weak C-band absorption effect of magnetic material absorber. • The wave-absorbing properties of the FeSiAl p /epoxy resin composite is greatly improved compared with the simple FR4 matrix material, the effective bandwidth (bandwidth with reflectance less than −10 dB) increased by 11.4 times from 0.32 GHz to 4.29 GHz, and the absorber has obvious C-band absorption effect. • After optimizing the dimensions of absorber, the FeSiAlp/epoxy resin composite absorber with a thickness of 2.2 mm reached peak simultaneously at 7.20 GHz and 15.40 GHz, and peak reflectivity reached −11.51 dB and −13.01 dB, respectively, and corresponding absorption reached 92.93% and 95.00%, respectively. The effective bandwidth reached 4.29 GHz, and the absorber had obvious absorption effect in C-band. A novel broadband incident angle independent magnetic composite metamaterial absorber with C-band absorbing effect is proposed. The wave-absorbing properties of the FeSiAl p /epoxy resin composite is greatly improved compared with the simple FR4 matrix material, the effective bandwidth (bandwidth with reflectance less than −10 dB) increased by 11.4 times from 0.32 GHz to 4.29 GHz, and the absorber has obvious C-band absorption effect. After optimizing the dimensions of absorber, the FeSiAlp/epoxy resin composite absorber with a thickness of 2.2 mm reached peak simultaneously at 7.20 GHz and 15.40 GHz, and peak reflectivity reached −11.51 dB and −13.01 dB, respectively, and corresponding absorption reached 92.93% and 95.00%, respectively. The effective bandwidth reached 4.29 GHz. The experiment basically verified the simulation results. Therefore, the absorber with special structure design not only overcomes the problem of narrow absorption band of metamaterials, but also solves the shortcoming of weak C-band absorption effect of magnetic material absorber. [ABSTRACT FROM AUTHOR]

In recent years, the development of lightweight broadband absorbers has always been pursued by researchers. In this paper, a low-frequency, broadband and lightweight absorber is designed and prepared by combining the metamaterial structure with the magnetic composite material. First of all, the quality of the absorber was low, which was 40% lower than that of traditional absorber composite materials. Secondly, the absorber had excellent absorbing effect, and its absorbing bandwidth (bandwidth with reflectivity less than −10 dB) reached 6.72 GHz, and its RL min (minimum reflection loss) value had dropped to − 23.94 dB. Finally, the absorber also had obvious effects at low frequencies, the absorber's RL min value reached − 10.10 dB at 7.36GH. Simultaneously, the experimental results also verify the above results very well. Therefore, this kind of absorber gives full play to the advantages of magnetic composite material and metamaterial structure. This design concept provides a new development path for the design of absorber materials, and will also play a huge role in promoting the application of absorbing materials in military and civilian fields, such as the research and development of a new generation of stealth fighters. [ABSTRACT FROM AUTHOR]

• The absorber with special structure design not only overcomes the problem of narrow absorption band of metamaterials, but also solves the shortcoming of weak C-band absorption effect of magnetic material absorber. • After optimizing the dimensions of FSS, The FeSiAlp/epoxy resin composite absorber with a thickness of 2.6 mm reached peak simultaneously at 7.46 GHz and 16.64 GHz, and peak reflectance reached −12.78 dB and −18.21 dB, respectively, and corresponding absorption reached 95.68% and 99.70%, respectively. Bandwidths with reflectivity less than −10 dB reached 8.13 GHz, the absorber had absorption effect in C-band. We present the design and measurement of broadband magnetic composite metamaterial absorber with C-Band absorbing effect. The absorber embeds the periodic array of concentric semicircular copper sheet in the FeSiAl p /epoxy composite material layer. The wave-absorbing properties of the FeSiAl p /epoxy resin composite is greatly improved compared with the simple FR4 matrix material, bandwidth with reflectance less than −10 dB increases from 0 GHz to 8.13 GHz. Simultaneously, due to the introduction of the frequency selective surface (FSS) structure, the absorber performance of the absorber is also improved in C-band. The peak of the absorber appears at 7.46 GHz, and the reflectivity reaches −12.78 dB, and the absorption reaches 94.72%. After optimizing the dimensions of FSS, The FeSiAlp/epoxy resin composite absorber with a thickness of 2.6 mm reached peak simultaneously at 7.46 GHz and 16.64 GHz, and peak reflectance reach −12.78 dB and −18.21 dB, respectively, and corresponding absorption reached 95.68% and 99.70%, respectively. Bandwidths with reflectivity less than −10 dB reaches 8.13 GHz, the absorber has obvious absorption effect in C-band. The experiment basically verified the simulation results. Hence, the absorber with special structure design not only overcomes the problem of narrow absorption band of metamaterials, but also solves the shortcoming of weak C-band absorption effect of magnetic material absorber. [ABSTRACT FROM AUTHOR]