Slab wave-absorbing material

Abstract

The invention belongs to the technical field of electronic information and relates to electromagnetic fields and electromagnetic waves, in particular to a slab wave-absorbing material. The slab wave-absorbing material comprises unit wave-absorbing structures which are periodically arranged, wherein each unit wave-absorbing structure comprises a medium baseplate, a front metallic structure of the medium baseplate and a back metallic structure of the medium baseplate. The front metallic structure comprises 2 to 4 mutually crossed first metallic branch lines, and both ends of each first metallic branch line are respectively provided with a vertically connected linear or tangentally connected curved second metallic branch line. The back metallic structure comprises 2 to 4 mutually crossed first metallic branch lines, and both ends of each first metallic branch line are respectively tangentally connected with one circular ring-shaped second metallic branch line. Compared with the existing slab wave-absorbing material, the slab wave-absorbing material of the invention can absorb the electromagnetic waves in any polarization direction, and can better absorb in the wider incident angles of the electromagnetic field; and the electromagnetic resonance structures are mutually independent, can be separately adjusted, and have the characteristic of convenient syntonization.

Description

technical field [0001] The invention belongs to the technical field of electronic information, relates to electromagnetic fields and waves, and in particular to flat-plate wave-absorbing materials. Background technique [0002] At present, the commonly used absorbing materials include ferrite, barium titanate, metal powder, graphite, silicon carbide, conductive fiber, etc. Ferrite absorbing material is a well-studied and relatively mature absorbing material. Due to its high magnetic permeability at high frequencies and large resistivity, electromagnetic waves are easy to enter and rapidly attenuate, and are widely used in In the field of radar absorbing materials. The wave-absorbing material with ferrite as the absorber also has certain defects, such as poor high-temperature characteristics and high surface density. The matching frequency of various wave-absorbing materials can only achieve non-reflection absorption when the matching thickness is matched. Electromagnetic pa...

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Problems solved by technology

This structure is a planar absorbing structure (such as figure 1 As shown), the front of the unit structure is an electric resonance structure composed of two back-to-back split rings, and the back is a rectangular metal sheet, which achieves the absorption function by trapping electromagnetic waves inside the structure for resonance. The experimental results show that the wave-absorbing material It can achieve an absorption rate of 88% in the working frequency band, but because it requires that the electric field polarization direction of the incident electromagnetic wave must be parallel to the length direction of the back metal sheet, it constitutes a great limit to its application.

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