一种基于金属开口谐振环和杆阵列的左手材料宽带吸收器

用数值仿真在微波X波段研究了金属开口谐振环和杆阵列这一最基本的谐振结构.通过合理的参数调节,这种结构在10.91 GHz附近可以表现出高达98%的吸收率,并且半高峰宽达到3.5 GHz.用散射参量提取法计算其有效电磁参数,发现在谐振频率附近其介电常数、磁导率和折射率的实部均为负值.相比于传统的左手材料,这种结构的电磁参数在谐振区域均具有较大的虚部,是形成高吸收率的根本原因.本文的左手材料吸收器在电磁加热、电磁隐身等领域具有许多潜在的应用.

Broadband lefthanded metamaterial absorber based on split ring resonator and wire array

We studied the basic resonance structure of split ring resonator (SRR) and wire array at microwave X-band numerically. With proper design of parameters, this structure could achieve the absorptivity as high as 98% near the frequency of 10.91 GHz, and the FWHM of which is greater than 3.5 GHz. The scattering parameter retrieval method is employed to calculate the effective electromagnetic parameters. It is found that, close to the resonance frequency, the real components of the effective permittivity, permeability, and refractive index are all negative. However, the imaginary components of the electromagnetic parameters seem to be very large in the resonance region, which is the main reason of the high absorptivity. The broadband lefthanded metamaterial absorber presented in this paper has potential applications such as in electromagnetic heating and electromagnetic hiding.