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Broadband patterned magnetic microwave absorber

2014; American Institute of Physics; Volume: 116; Issue: 4 Linguagem: Inglês

10.1063/1.4891475

1520-8850

Wei Li, Tianlong Wu, Wei Wang, Pengcheng Zhai, Jianguo Guan,

Metamaterials and Metasurfaces Applications

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.