人工磁导体吸波体设计及其应用

摘要

对基于涡旋谐振环的人工磁导体(AMC)结构引入介质损耗,得到了一种"高吸波率"吸波体,实现了单一频点2 GHz下较强的窄带吸波;然后加载集总参数元件拓展吸波体的频带宽度,在低频超宽带1.7~2.2 GHz范围实现了90%以上的吸收率,并对其吸波机理进行了分析;最后将宽带吸波体敷设到开缝腔体内壁上抑制腔体谐振,解决了屏蔽腔体的高谐振问题,开辟了超材料的一个新的应用领域.%Introducing dielectric loss to the artificial magnetic conductor (AMC) based on vortex resonance,a perfect microwave absorber is achieved.The structure can realize strong microwave absorbing at the designed frequency which is 2 GHz.With lumped elements loaded to this structure,the frequency band is expand to a broadband range.Specifically,the absorptivity of the improved structure can achieve more than 90 percent at frequency band of 1.7~2.2 GHz.At the same time,the absorbing mechanism is analyzed.Finally,the designed broadband microwave absorber are applied to a slotted cavity,and the simulation results show that the absorber can restrain cavity resonance.The proposed microwave absorber design provides a method for shielding high resonant cavity,and develops a new application filed for metamaterials.