Metamaterial with dual function of sound insulation and microwave stealth

Abstract

The invention firstly discloses a metamaterial with a dual function of sound insulation and microwave stealth. An upper conductive film layer (1) is located above a middle skeleton layer (2) and is periodically arranged; a lower conductive film reflecting layer (3) is located below the middle skeleton layer (2); the upper conductive film layer (1) and the lower conductive film reflecting layer (3)respectively deposit in surfaces of an upper PET film (4) and a lower PET film (5); the upper PET film (4) supports the upper conductive film layer (1); the upper conductive film layer (1) has a ringstructure; the middle skeleton layer (2) adopts a symmetric or asymmetric structural unit; and a ring structure period of the upper conductive film layer (1) is the same as or different from a periodof the middle skeleton layer. The metamaterial achieves sound transmission loss more than 10 dB in a frequency band of 1050 Hz-1350 Hz, and has a high application prospect in effective suppression ofa backward radar cross section (backward RCS reduces by more than 10 dB) in the frequency band of 7.1 GHz-18.0 GHz.

Description

technical field [0001] The invention relates to multi-physical field coordinated regulation of electromagnetic field and acoustics, in particular to a sound-insulating microwave stealth dual-function metamaterial. Background technique [0002] New artificial electromagnetic materials (Metamaterials) and electromagnetic metasurfaces (Metasurface) are composed of periodic arrangement of sub-wavelength unit structures of a certain scale. At this stage, Metamaterials and Metasurface have been widely used in the independent regulation of electromagnetic field, thermal field, stress field and sound field. However, for some special application environments (which need to satisfy the regulation of many different physical fields at the same time), the existing regulation methods cannot meet the practical application requirements. [0003] With the emergence of thin-film acoustic metamaterials, a new possibility is provided for the emergence of acoustoelectric coherent metamaterials....

AI Technical Summary

Problems solved by technology

However, for some special application environments (need to meet the regulation of different physical fields at the same time), the existing regulation methods cannot meet the actual application requirements.

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