双频窄带超材料吸波体的设计

Design of dual narrow-bands metamaterial absorber

为了降低吸波体的雷达散射截面,实现完美吸波,利用超材料的电磁谐振特性,设计了一款开缝双环型结构吸波体。得益于超材料的LC谐振,该结构在1.59和4.06GHz具有超强吸波特性,在谐振频点处,超材料吸波体的某些区域相当于一个电磁波收集器,将能量限制在吸波体内,再转化成热能。经计算验证,该吸波体结构在1.59、4.06GHz的雷达散射截面(RCS)分别为-24、-23dB,远低于传统金属表面结构,能实现理想吸波。

In order to reduce radar cross section （RCS）of absorber and achieve perfect absorbing,a kind of double rings with slots absorber is designed based on the characteristic of metamaterial electromagnetic resonance.Strong absorbing is a-chieved in 1.59 GHz and 4.06 GHz for the LC resonance of metamaterial.In some specific locations of metamaterial absorb-er are equal to electromagnetic wave collector at resonance frequencies,and energy is confined in it and converted into heat. The calculation verifies that RCS of the absorber at operating frequencies 1.59 GHz and 4.06 GHz is respectively -24 dB and -23 dB,and less than conventional metal surface.The perfect absorbing is achieved.