Broadband patterned magnetic microwave absorber

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 absorb...

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Bibliographic Details
Published in:Journal of applied physics 2014-07, Vol.116 (4)
Main Authors: Li, Wei, Wu, Tianlong, Wang, Wei, Zhai, Pengcheng, Guan, Jianguo
Format: Article
Language:English
Subjects:
Absorbers
ABSORPTION
Applied physics
Broadband
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIFFRACTION
GHZ RANGE
MAGNETIC PROPERTIES
Magnetic resonance
Microwave absorbers
Microwave absorption
MICROWAVE RADIATION
RESONANCE
THICKNESS
Weight reduction
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Summary: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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4891475