基于有源超材料的可调超薄雷达吸波体研究

Investigation on tunable ultra-thin radar absorber based on active metamaterial

在超材料结构中引入电阻和有源变容二极管,通过合理设计微结构型式以及微结构之间的连线方式,实现吸波频带的动态可调,研究电阻、电容和入射波极化方向对吸波特性的影响。结果表明:通过改变外加电压调整超材料的吸收频段,在3.7倍频带范围内实现吸波频段的主动自调节;吸波体的总厚度仅为波长的1/181,相比于传统吸波材料,在同等吸波性能条件下,表现出了优异的超薄特性;TE和TM极化电磁波表现出相同的吸波效果,即吸波特性对入射波的极化方向不敏感。

A sort of state-of-the-art metamaterial was introduced to serve as an active ultra-thin RAM. The metamaterial consisted of resistors, varactor diodes and micro-structure array. The effect of resistor, capacitor and electromagnetic polarization on the absorbing properties was investigated in detail. The results indicate that its absorption band can be regulated in 3.7 times frequency-band by actively changing the external voltage. The total thickness of the metamaterial RAM is only 1/181 of the wavelength. Compared with the traditional absorbing materials, the metamaterial RAM shows excellent ultra thin feature under the same wave absorbing performance. In addition, for TE and TM polarized electromagnetic wave, the metamaterial RAM exhibits the same wave absorbing property, i.e., its absorbing property is insensitive to the polarization direction of incident wave.