An ultra-broadband and lightweight fishnet-like absorber in microwave region

作者：Chen, Xiqiao; Chen, Xin; Wu, Zhuang; Zhang, Zilong; Wang, Zilin; Heng, Liuyang; Wang, Shuai; Zou, Yanhong^*; Tang, Zhixiang

来源：Journal of Physics D: Applied Physics , 2018, 51(28): 285002.

DOI：10.1088/1361-6463/aac907

• fishnet
• microwave absorber
• ultra-broadband
• lightweight

Fishnet metamaterials have shown their excellent absorption at terahertz and optical frequencies. Here, we experimentally demonstrate an ultra-broadband and lightweight microwave absorber by fabricating a conventional magnetic absorbing material into a fishnetlike structure. Compared with the pure absorbing material, the broadest absorption bandwidth (less than -10 dB) of the fishnet-like absorber is extended from 7.4-11 GHz to 4.8-20.7 GHz. Meanwhile, the high surface density, which is a important shortcoming for the magnetic absorbing materials, has been reduced clearly because a large part of magnetic microwave absorption material has been removed. The ultra-broadband absorption is a result of the structure-induced strong magnetic resonances and electric confinement excited by the magnetic loop, which made the effective impedance of our structure matched well with the free space within the absorption bandwidth. Our results may provide a method for further improving the performance of the pure microwave absorbing materials.

• 出版日期2018-7-18
• 单位湖南大学