A pure dielectric metamaterial absorber with broadband and thin thickness based on a cross-hole array structure  

作　　者：Wenbo Cao Youquan Wen Chao Jiang Yantao Yu Yiyu Wang Zheyipei Ma Zixiang Zhao Lanzhi Wang Xiaozhong Huang 曹文博;温又铨;姜超;余延涛;王艺宇;麻哲乂培;赵子翔;王兰志;黄小忠(Powder Metallurgy Research Institute,Central South University,Changsha 410083,China;State Key Laboratory of Powder Metallurgy and Hunan Key Laboratory of Advanced Fibers and Composites,Central South University,Changsha 410083,China)

机构地区：[1]Powder Metallurgy Research Institute,Central South University,Changsha 410083,China [2]State Key Laboratory of Powder Metallurgy and Hunan Key Laboratory of Advanced Fibers and Composites,Central South University,Changsha 410083,China

出　　处：《Chinese Physics B》2022年第11期571-576,共6页中国物理B（英文版）

基　　金：Project supported in part by the Young Scientific and Technological Innovation Talents in Hunan,China(Grant No.2021RC3003);the Science and Technology Plan Project of Hunan Province,China(Grant No.2015TP1007);Initial Research Funding for Special Associate Professor by Central South University(Grant No.202045002);the National Natural Science Foundation for Young Scientists of China(Grant No.51802353)。

摘　　要：A pure dielectric metamaterial absorber with broadband and thin thickness is proposed,whose structure is designed as a periodic cross-hole array.The pure dielectric metamaterial absorber with high permittivity is prepared by ceramic reinforced polymer composites.Compared with those with low permittivity,the absorber with high permittivity is more sensitive to structural parameters,which means that it is easier to optimize the equivalent electromagnetic parameters and achieve wide impedance matching by altering the size or shape of the unit cell.The optimized metamaterial absorber exhibits reflection loss below-10 dB in 7.93 GHz–35.76 GHz with a thickness of 3.5 mm,which shows favorable absorption properties under the oblique incidence of TE polarization(±45°).Whether it is a measured or simulated value,the strongest absorbing peak reaches below-45 dB,which exceeds that of most metamaterial absorbers.The distributions of power loss density and electric and magnetic fields are investigated to study the origin of their strong absorbing properties.Multiple resonance mechanisms are proposed to explain the phenomenon,including polarization relaxation of the dielectric and edge effects of the cross-hole array.This work overcomes the shortcomings of the narrow absorbing bandwidth of dielectrics.It demonstrates that the pure dielectric metamaterial absorber with high permittivity has great potential in the field of microwave absorption.

关 键 词：DIELECTRIC metamaterial absorber 

分 类 号：O469[理学—凝聚态物理]