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中文摘要：
本文设计了一种超薄螺旋结构超材料吸波体，其厚度（1．034mm）约为其工作波长（4．81GHz，6．59GHz，9．16GHz，12．69GHz和13．71GHz）的（1／60，1／44，1／32，1／23，1／21）．仿真和实验结果表明，该吸波体在4．81GHz，6．59GHz，9．16GHz，12．69GHz和13．71GHz处吸收率分别达到94．55％、99．89％、99．73％、99．26％和99．41％，实现了多频带强吸收．从表面电流和功率损耗密度两个方面分析了产生强吸收的原因，理论分析表明，多频带强吸收能在五个相邻频率处产生多阶局域表面等离激元谐振，螺旋结构之间强烈的电谐振使超材料结构单元产生强烈的吸收．该超材料吸波体设计简单、易于制作和应用，在电磁波吸收中具有应用价值．
英文摘要：
In this paper, an ultra-thin spiral-structured metamaterial absorber is demonstrated both numerically and exper- imentally, whose thickness （1.034 mm） is about （1/60th, 1/44th, 1/32th, 1/23th, 1/21th） of the respective working wavelengths （4.81, 6.59, 9.16, 12.69 and 13.71 GHz）. Simulation results show that the absorber can achieve absorp- tion up to 94.41%, 99.89%, 99.73%, 99.26% and 99.41% at 4.81, 6.59, 9.16, 12.69 and 13.71 GHz respectively. Thus multi-band absorptions are realized. From the two aspects of surface current and power loss density, the mechanism of strong absorption is analyzed. Theoretical analysis shows that the multi-band absorption arises from multi-order plasmon resonances at five neighboring frequencies. Strong absorptions are induced due to strong electric resonances within/between the spiral structures. Design of the metamaterial absorber is simple and is easy to be implemented, so such absorbers may have application values in designing novel electromagnetic absorbers
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