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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.
Based on the Resistance Frequency Selective Surface (RFSS), a metamaterial absorber with low frequency band, polarization insensitivity and wide angle of incidence is designed.The basic unit of the absorber consists of a slotted cross plane CCPM, RFSS, dielectric substrate and metal backplane.The results of numerical simulation using FDTD method show that the RFSS absorber, CCPM and RFSS are more effective than pure CCPM absorber The low-frequency absorption characteristics of the structure absorber are greatly improved, with the absorption rate greater than 80% and the absorption peak reaching more than 98% in the whole frequency range from 1 to 5 GHz.The absorptions under different polarization angles and different angles of incidence The rate shows that the composite structure absorber has polarization insensitivity and wide-angle absorption characteristics.