宽频蜂窝夹层结构吸波复合材料的低频隐身介质超材料研究

Study on the low frequency radar-stealth dielectric metamaterial of broadband wave-absorbing honeycomb sandwich composites

研究用于宽频蜂窝夹层结构吸波复合材料的介质超材料的低频隐身性能,分析碳纤维介质超材料单元的电磁响应特性及其对蜂窝夹层结构吸波复合材料电性能和力学性能的影响。结果表明:制备的碳纤维介质超材料单元可以实现与金属超材料单元相当的电磁响应效果;当吸波蜂窝高度为50 mm、透波面板厚度为1 mm时,碳纤维介质超材料单元的引入,可以使吸波蜂窝夹层结构复合材料低频吸波性能得到显著提升,L波段反射率最弱值提升2 dB以上,平均反射率提升4 dB以上;含碳纤维介质超材料单元透波面板基本力学性能与透波面板复合材料自身力学性能基本相当,引入碳纤维介质超材料单元不会降低透波面板力学性能。

The low frequency radar-stealth performance of the dielectric metamaterial for broadband wave-absorbing honeycomb sandwich composites was studied.The electromagnetic response characteristics of the carbon fiber dielectric metamaterial units and their effects on the electrical and mechanical properties of wave-absorbing honeycomb sandwich composites were analyzed.The results show that the electromagnetic response of the carbon fiber metamaterial units can be comparable to that of the metal metamaterial units.When the height of the wave-absorbing honeycomb is 50 mm and the thickness of the wave-transmitting skin is 1 mm,the introduction of the carbon fiber metamaterial units can significantly improve the low-frequency wave-absorbing performance of the honeycomb sandwich composites.The weakest reflectivity and the averaged reflectivity in the L-band are increased by more than 2 dB and 4 dB,respectively.The mechanical properties of the wave-transmitting skin with carbon fiber dielectric metamaterial are close to that without metamaterial units.The introduction of carbon fiber dielectric metamaterial units shows no negative effects on the mechanical properties of the wave-transmitting skin.