CAJ | 학술논문

设计了一种基于一阶Minkowski分形双方环(Minkowski fractal double square loop, MFDSL)电谐振器结构与电阻膜复合的超薄、宽频带、极化不敏感和宽入射角的超材料吸波体.该吸波体的基本结构单元由MFDSL电谐振器结构、方块电阻膜、电介质基板和金属背板组成.采用时域有限差分算法对这种复合结构吸波体的电磁波吸收特性进行数值模拟分析.模拟得到的反射率和吸收率表明:该吸波体在7.5—42 GHz之间对入射电磁波具有大于90%以上的强吸收特性.模拟得到的不同极化角和不同入射角下的吸收率表明:该吸波体具有极化不敏感和宽入射角特性.进一步的数值模拟结果表明,该复合结构吸波体对电磁波的吸收主要是基于电磁谐振和电路谐振机制,通过方块电阻的设计可以实现工作频率范围的调节.
설계료일충기우일계Minkowski분형쌍방배(Minkowski fractal double square loop, MFDSL)전해진기결구여전조막복합적초박、관빈대、겁화불민감화관입사각적초재료흡파체.해흡파체적기본결구단원유MFDSL전해진기결구、방괴전조막、전개질기판화금속배판조성.채용시역유한차분산법대저충복합결구흡파체적전자파흡수특성진행수치모의분석.모의득도적반사솔화흡수솔표명:해흡파체재7.5—42 GHz지간대입사전자파구유대우90%이상적강흡수특성.모의득도적불동겁화각화불동입사각하적흡수솔표명:해흡파체구유겁화불민감화관입사각특성.진일보적수치모의결과표명,해복합결구흡파체대전자파적흡수주요시기우전자해진화전로해진궤제,통과방괴전조적설계가이실현공작빈솔범위적조절.
An ultrathin, wideband, polarization-insensitive and wide-angle metamaterial absorber is presented, which is based on one order Minkowski fractal double square loop (MFDSL) electric resonator structure and resistance film. The unit cell of this absorber consists of MFDSL, square resistance film, dielectric substrate and metal ground plane. The simulations and analyses of electromagnetic absorbing properties of this composite structure absorber are performed by the finite-difference time-domain method. The simulated reflection and absorption indicate that the absorption of the composed structure absorber is greater than 90%in a frequency range of 7.5–42 GHz. The simulated absorptions under different polarization conditions and incident angles indicate that this composite structure absorber is polarization-insensitive and of wide-angle. The further numerical simulation results indicate that the absorption of this absorber originates mainly from the absorbing mechanism of electromagnetic resonance and circuit resonance, the operation frequency range can also be adjusted by the design of the square resistance.