Broadband patterned magnetic microwave absorber
Broadband patterned magnetic microwave absorber
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宽带图案磁性微波吸收器
DOI：
10.1063/1.4891475
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发表时间：
2014-07-28
影响因子：
3.2
通讯作者：
Guan, Jianguo
中科院分区：
文献类型：
--
作者：
Li, Wei;Wu, Tianlong;Guan, Jianguo
由于现有材料参数的限制，要大幅度提高传统平板吸波材料的工作带宽是一个艰巨的任务。在这项工作中，提出了一种简单的图案化方法来极大地展宽传统磁性吸波材料的吸收带宽。作为示范，设计并实验实现了在4-40 GHz频率范围内吸收率超过90%的超宽带微波吸收材料，其厚度为3.7 mm，重量相当于2 mm厚的平板吸波材料。在这种图案化的吸收体中，宽带强吸收主要来源于多个λ/4共振和边缘衍射效应的同时并存。这项工作为极大地扩展现有吸波材料的微波吸收带宽提供了一条简便的途径。
It is a tough task to greatly improve the working bandwidth for the traditional flat microwave absorbers because of the restriction of available material parameters. In this work, a simple patterning method is proposed to drastically broaden the absorption bandwidth of a conventional magnetic absorber. As a demonstration, an ultra-broadband microwave absorber with more than 90% absorption in the frequency range of 4–40 GHz is designed and experimentally realized, which has a thin thickness of 3.7 mm and a light weight equivalent to a 2-mm-thick flat absorber. In such a patterned absorber, the broadband strong absorption is mainly originated from the simultaneous incorporation of multiple λ/4 resonances and edge diffraction effects. This work provides a facile route to greatly extend the microwave absorption bandwidth for the currently available absorbing materials.