Design, fabrication and wide-angle broadband absorption characteristics of the multilayer microwave absorber

3D printing technology provides multi-scale, multi-material and multi-dimensional manufacturing capability for microwave absorber, which is beneficial to take advantage of the combination of material loss and structural loss. In this work, a three-layer periodic crisscrossed structural microwave absorber was fabricated by using FeSiAl-MoS₂-GN/PLA composite filaments, and the effects of the geometric parameters of the unit cell and the combination of materials of each layer on the absorption performance of the complex structural absorber were investigated. The effective absorption bandwidth (EAB, for RL≤−10 dB) of the absorber is 12.7 GHz when the graphene content of dielectric layer, absorption layer and matching layer is 0wt%, 5wt% and 4wt% in turn. At the same time, the EAB value are greater than 10 GHz when the incident angles of TE polarized wave and TM polarized wave are less than 40° and 70°, respectively. This study provides a theoretical and applied basis for the design and manufacture of wide-angle and broadband wave absorbers due to the experimental results are basically consistent with the simulation results.