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设计了三种类型吸波体,分别为基于正方形金属贴片(square metal patch,SMP)结构超材料吸波体、电阻型频率选择表面(Resistance Frequency Selective Surface,RFSS)吸波体和SMP与RFSS的复合结构吸波体.采用FDTD算法分别对这三种类型吸波体的电磁波吸收特性进行数值模拟分析.模拟得到的结果表明:在整个2—30 GHz频率范围内,SMP吸波体,通过几何参数的设计可以实现多频窄带强吸收;RFSS吸波体,通过方块电阻的设计可以实现高频宽带强吸收,但强吸收的带宽有限;SMP与RFSS的复合结构吸波体,在3—25GHz之间吸收率大于90%以上,且宽频范围内与自由空间具有较好的阻抗匹配特性.
Three types of wave absorbers are designed, which are respectively based on square metal patch (SMP) structure metamaterial absorber, resistance frequency selective surface (RFSS) absorber and SMP and RFSS Of the composite structure of the wave absorber.The FDTD algorithm were used to conduct numerical simulation of the electromagnetic wave absorption characteristics of the three types of wave absorbers.The simulation results show that: SMP absorber through the frequency range of 2-30 GHz, The design of geometrical parameters can realize the multi-band narrow-band strong absorption. The RFSS wave-absorbing body can absorb the high-frequency wide band through the design of the square resistance, but the bandwidth of strong absorption is limited. 25GHz between the absorption rate of more than 90%, and broadband and free space with good impedance matching characteristics.