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中文摘要：
提出了多频与宽频超材料吸收器结构模型,该吸收器是由刻蚀在介质基板两面的金属图案组成,其正面是由不同大小的金属铜圆片和金属铜圆环结构组合而成,反面完全覆盖金属铜.由于不同几何大小的圆片或圆环结构的谐振频率不同,且是相互独立的.因此通过将两种不同几何大小的圆片与圆环结构组合,使其在不同频率谐振,便可得到双频吸收器;而将三种不同几何大小的圆片和圆环结构组合便可得到三频吸收器;同理可得到四频吸收器.同时,通过研究吸收器的电场分布,验证了不同几何大小的圆片或圆环结构在不同频率谐振.若通过优化组合圆片和圆环结构,使其谐振频率紧密相连则可得到宽频吸收器.
英文摘要：
Multiband and broadband metamaterial absorbers have been proposed in the paper. The proposed absorbers are composed of metallic copper patterns on both sides of a dielectric layer. One side consists of metallic circular patches and metallic annular patches, and the other side is of metallic ground plane. Each distinct metallic circular patch unit cell or annular patch unit cell has one distinct resonant peak in a very narrow band, and these unit cells are independent of one an other. Therefore, combining two different unit cells which resonates at different frequencies can obtain dual-band absorber. Based on the theory, combining three different unit cells can obtain tri-band absorber, and combining four different unit cells can obtain the absorber which resonates at four different frequencies. In addition, the electric field distribution verifies that each distinct unit cell resonates at a different frequency. Broadband metamaterial absorber can be obtained according to the optimized combination of the different unit cells. Increasing the number of different unit cells broadens the frequency range when their resonances are closely packed together, thereby resulting in a broadband resonance.
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