Coded absorbing metamaterials for broadband radar cross-section reduction

Abstract

The invention relates to a coding wave-absorbing meta-material for the reflection section reduction of a broadband radar, and relates to the technical field of radar hiding and novel artificial electromagnetic materials. The meta-material comprises a plurality of periodic unit structures, and each unit structure comprises an upper conductive film layer, a dielectric substrate and a metal reflection backboard, wherein the upper conductive film layer is located on the upper surface of the dielectric substrate. The plurality of unit structures are arranged to be symmetric, thereby guaranteeing that an electromagnetic wave represents polarization insensitive characteristics. The wave-absorbing meta-material is spatially arranged, and has the symmetry breaking characteristics, wherein the arrangement mode is determined by the characteristics of the coding wave-absorbing meta-material. The wave-absorbing meta-material can achieve the RCS reduction effect (10dB or more) in a range of 6.5-20 GHz. Particularly, the target RCS reduction effect is better than the RCS reduction effect of pure periodic wave-absorbing materials in the range of 9-20GHz. The coding wave-absorbing meta-material isbetter in target RCS reduction than a conventional coding meta-material and the wave-absorbing materials. Moreover, the meta-material is simple in technology, integrates the structure with the functions, is small in areal density, and can play an important role in the field of target hiding.

Description

technical field [0001] The invention relates to the technical field of radar stealth and new artificial electromagnetic materials, in particular to a coded wave-absorbing metamaterial with reduced broadband radar scattering cross-section, which can be used for engineering design and application of coded metamaterials, and its application scope involves stealth, radar detection and electromagnetic scattering. Background technique [0002] The method of radar stealth is to use various methods to reduce the radar cross section (RCS) of the target. The traditional RCS reduction methods include two categories: one is to use absorbing materials to convert electromagnetic wave absorption into heat energy, so as to achieve RCS reduction. However, in practical applications, this method is limited by the properties of the absorbing material (bandwidth and absorption strength, etc.) and its weight, volume, etc.; the other is to control target scattering, through shape design, active ca...

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Problems solved by technology

[0002] The method of radar stealth is to use various methods to reduce the radar cross section (RCS) of the target. The traditional RCS reduction methods include two categories: one is to use absorbing materials to convert electromagnetic wave absorption into heat energy, so as to achieve RCS reduction. However, in practical applications, this method is limited by the properties of the absorbing material (bandwidth and absorption strength, etc.) and its weight, volume, etc.; the other is to control target scattering, through shape design, active cancellation and Source cancellation and other methods redistribute the electromagnetic wave energy, thereby reducing the RCS of the electromagnetic wave. However, this method reduces the RCS in one direction or within a certain angle range, and at the same time increases the RCS in other directions.

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