Multi-layer wave absorber structure and use thereof

A multi-layer wave absorber structure, having a sandwich structure, wherein an intermediate layer of the sandwich structure is an electromagnetic loss-free dielectric layer;

• the multi-layer wave absorber structure comprising a metal backing, a first composite wave absorbing material layer, the electromagnetic loss-free dielectric layer, and a second composite wave absorbing material layer that are sequentially stacked on a surface of the metal backing;
• wherein the electromagnetic loss-free dielectric layer comprises a vacuum layer, an air layer, or an electromagnetic loss-free material layer, wherein the electromagnetic loss-free material layer is made of one or more materials selected from the group consisting of paraffin and polytetrafluoroethylene;
• wherein the first composite wave absorbing material layer and the second composite wave absorbing material layer each comprise an electromagnetic wave absorbing agent and a binder, and a mass ratio of the electromagnetic wave absorbing agent to the binder is in a range of 0.1-10:1;
• wherein the electromagnetic wave absorbing agent is at least one selected from the group consisting of graphene, carbonyl iron, ferrite, and rare earth-transition intermetallic compounds;
• wherein the first composite wave absorbing material layer and the second composite wave absorbing material layer each independently have a thickness of 0.1-2 mm;
• and
• wherein the multi-layer wave absorber structure has a thickness of less than or equal to 3 mm.