摘要:
基于电阻型频率选择表面（Resistance Frequency Selective Surface,RFSS）设计了一种低频宽带、极化不敏感和宽入射角特性的超材料吸波体.该吸波体的基本单元由开槽十字型平面超材料（Cave Cross Planar Metamatetial,CCPM）、RFSS、电介质基板和金属背板组成.采用FDTD方法数值模拟得到的结果表明：相比于单纯的CCPM吸波体、RFSS吸波体,CCPM和RFSS复合结构吸波体低频吸收特性得到极大改善,在整个1—5 GHz频率范围内,吸收率大于80%,吸收峰值达到98%以上.数值模拟得到的不同极化角和不同入射角下的吸收率表明：该复合结构吸波体具有极化不敏感和宽角度吸收特性.
Abstract:
A low-frequency broadband, polarization-insensitive and wide-angle metamaterial absorber is presented, which is based on resistance frequency selective surface （RFSS）. The unit cell of this absorber consists of cave cross planar metamaterial （CCPM）, RFSS, dielectric substrate and metal backboard. The simulated results based on FDTD method indicate that with the absorptions of compared to the individual CCPM absorber and RFSS absorber, the absorption of the composite structure absorber of CCPM and RFSS is enhanced greatly, and it is greater than 80% and the absorption peak is over 98% in the whole frequency range of 1-5 GHz. The simulated absorptions under the conditons of different polarization and incident angles indicate that this composite structure absorber has polarization-insensitive and wide-angle absorption.
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