基于电流变液的宽带可调超材料吸波体设计

The Design of Wideband Tunable Metamaterial Absorber Based on Electrorheological Fluid

为将超材料吸波体更好地应用于生产生活中,文中设计了一种基于电流变液的宽带可调超材料吸波体。通过在超材料吸波体中加载电阻器和介电常数电可调的电流变液实现宽带吸收和吸收频带可调。仿真结果表明,吸波体在8.296~15.128 GHz之间的吸收率超过了80%,在11.5~15 GHz之间的吸收率超过了90%,实现了电磁波的宽带吸收。随着电流变液外加电场强度的增加,其吸收频带逐渐往低频发生移动,实现了吸收频带的调控。此外,仿真证实,由于吸波体结构单元具有旋转对称性,其吸收特性具有极化无关性。

In order to better apply the metamaterial absorber to the practice,a new kind of wideband tunable metamaterial absorber based on electrorheological fluid is proposed in this paper.The wideband and tunable absorption are achieved by loading resistor and electrorheological fluid with electrically tunable permittivity in metamaterial absorber.The simulation results showed that the absorption of absorber reaches up to 80%from 8.296 GHz to 15.128 GHz,and reache up to 90%from 11.5 GHz to 15 GHz,which realizes the property of wideband absorption.The absorption band gradually shifts to lower frequency with the increasing of electric field strength applied on electrorheological fluid,realizing the tunable property of wideband absorption.Moreover,the absorption property of absorber is insensitive to polarization due to its rotational symmetry.