Four-dimensional invisible wave-absorbing structure and preparation method thereof

Abstract

The invention discloses a four-dimensional invisible wave-absorbing structure and a preparation method thereof. The four-dimensional invisible wave-absorbing structure comprises a plurality of honeycomb periodic structure units, wherein electromagnetic periodic structures are arranged on the inner walls of at least part of the honeycomb periodic structure units. According to the wave-absorbing structure, the electromagnetic periodic structure is arranged on the inner wall of the honeycomb hole grid, a wave-absorbing material does not need to be coated while a conductive path is prolonged, and due to the fact that the electromagnetic periodic structure is hidden in the inner wall of the honeycomb hole grid and is prevented from being in direct contact with air, the conditions of falling off, circuit breaking and the like of the electromagnetic periodic structure are prevented. The low-frequency wave absorbing performance can be achieved through the electromagnetic periodic structure, the thickness of a honeycomb does not need to be increased, and the weight of the electromagnetic periodic structure can be ignored compared with that of a traditional coating type material spraying agent. Therefore, the wave-absorbing mechanism has the advantages of being simple and efficient in machining procedure, stable in electromagnetic performance, adjustable, light, thin, small in specific density, high in specific strength and the like.

Description

technical field [0001] The invention relates to a wave-absorbing material, in particular to a four-dimensional stealth wave-absorbing structure and a preparation method thereof. Background technique [0002] Traditional absorbing honeycomb materials are generally two typical materials: impregnated or filled; the methods used for these two absorbing honeycombs are: impregnating the absorbing agent on the surface of the honeycomb or filling foam, gypsum, etc. In the cells of the absorbing honeycomb. Although the traditional preparation of microwave-absorbing honeycomb has a simple manufacturing process and good absorption effect, the honeycomb prepared by the traditional method has disadvantages such as small controllability of electromagnetic properties, large weight, low bonding strength, and poor weather resistance. Especially for absorbing low-frequency electromagnetic waves, the traditional wave-absorbing honeycomb still has relatively large defects. The remedies include...

AI Technical Summary

Problems solved by technology

At present, in the prior art, there is an improved method of selectively impregnating the honeycomb, in which the wave-absorbing coating of the honeycomb structure is periodically arranged. This improved method can increase the propagation path of electromagnetic waves in the honeycomb cells and also The use of paint is reduced, but this method cannot completely avoid the shortcomings of traditional coating absorbing materials, and it also has the disadvantage that impregnated paint is easy to fall off

[0004] In the prior art, there is also a superstructure honeycomb composite absorbing material that combines absorbing honeycomb and flat metamaterial, wherein the metamaterial absorbing layer is made of a metamaterial array on a printed circuit board, and the metamaterial array is made of a square , box-shaped, back-shaped or cross-shaped metal unit array, combining the metamaterial absorber with the honeycomb absorbing material, through the selective absorbing function of the metamaterial absorber to realize the broadband of the superstructure honeycomb composite absorbing material However, the honeycomb used in this method is still the traditional impregnated absorbing honeycomb, and the metamaterial flat plate is fixed with epoxy resin on the printed circuit board and the absorbing honeycomb, which has not realized the true sense of the word. Integrated honeycomb periodic absorbing structure

Images