多层级异质异构吸波超材料功能化设计及熔融沉积 3D 打印

In order to meet the key requirements of lightweight and big absorbing bandwidth for the development of wave absorbing materials towards engineering applications, a hierarchical heterogeneous isomeric wave-absorbing metamaterial composing of lossy resonant structures and functionalized dielectric layer is proposed. The lightweight and the broadband absorbing properties of wave-absorbing metamaterial are achieved by bionic structural design for the dielectric layer. A composite material with specific conductivity is prepared by combining thermoplastic polymer material and silver copper alloy. By optimizing the weight ratio of silver copper alloy and the printing process of composite material, the conductivity of the resonant structure is controlled precisely. Based on this, two lossy resonant structure layers are designed to regulate broadband impedance matching and ohmic loss, then the hierarchical isometric heterogeneous wave-absorbing metamaterial is realized based on the dual-material fusion deposition 3D-printing process. The equivalent density of the prepared wave-absorbing metamaterial is 0.3 g/cm³. The electromagnetic performance test showed that the absorbing metamaterial, under the condition of vertical incidence, achieved high-efficient absorbing performance in 3.8-19.24 GHz. At the same time, when the electromagnetic wave is in the modes of transverse electric wave (Transverse Electric, TE) and transverse magnetic wave (Transverse Magnetic, TM) and the incidence angle is in the range of 50°, the wave-absorbing metamaterial had good broadband absorbing performance. The design and fabrication methods for the hierarchical heterogeneous isomeric wave-absorbing metamaterials provide technical support for promoting the development of wave-absorbing metamaterial to engineering application.