人工电磁超材料具有自然界材料所不具备的电磁参数，并且拥有可设计性和可灵活调节的性质，可实现对电磁波传播性能进行新的调控，是近年来国际物理学、材料学和信息科学领域的研究热点。首先介绍了人工电磁超材料的概念内涵和近年来的发展概况，简要分析了国外人工电磁超材料研究的发展水平，以及美欧军事强国对超材料研究的重视和支持情况。重点介绍了南京大学开展的一些人工电磁超材料在微波吸波材料结构中的应用探索，包括超材料微波吸波结构的设计和分析、基于人工手征超材料结构的吸波结构设计、吸波频带可调节及可切换的微波吸波结构设计等。这些材料和结构运用人工超材料的特殊物理特性和参数的可设计性，与传统微波吸波材料相比，具有可调节的优势，有效提高了对电磁波的调控能力。
Electromagnetic (EM) metamaterial usually possesses peculiar constitutive parameters and designable or tun-able EM properties that can not be found in natural material .It becomes a hot research topic among physics , material re-search and information science in recent years due to its ability of manipulation of electromagnetic wave propagation .In this paper, we first describe the theoretical concept of the EM metamaterial and analyze the present research status with the emphasis on how the western countries support the metamaterial research .In the second part, we report several attempts by group in Nanjing University that are trying to apply the metamaterial concept to microwave absorbers or stealth technolo-gy, including design of metamaterial microwave absorbers , chiral metamaterial based microwave absorber , tunable or switchable microwave absorbers.Comparing with conventional microwave absorber , these designs have the advantages of designable physical parameters and tunable properties , enhancing the ability of manipulating the EM wave with metamate-rials.
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