A broadband far-field microwave absorber with a sandwich structure. (5th April 2016)

• Record Type: Journal Article
• Authors: Wang, Tao; Wang, Peng; Wang, Ying; Qiao, Liang
• Is Part Of: Materials & design. Volume 95(2016)
• Page Start: 486
• Page End: 489
• Publication Date: 2016-04-05
• Subjects: Microwave absorber -- Multilayer absorber -- Broadband; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2016.01.096
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: It is a tough task to get the broad working frequency for the far-field absorber with flat and continuous layer structure. In this work, a simple method is proposed to drastically broaden the absorption bandwidth based on a common magnetic absorber made by carbonyl iron (CI) composite. The broadband absorber has a sandwich structure of CI composite/thin amorphous alloy slice/CI composite. The measurements results show that two strong absorption peaks simultaneously appear at different frequencies and the summation of the two strong absorption peaks dramatically broadens the absorption bandwidth. The analysis of the results reveals that the thin amorphous alloy slice plays an important role to generate two absorption peaks. This study explores a facile route to extend the bandwidth of the absorber filled by magnetic particles. Graphical abstract: Highlights: An absorber composed of two layer carbonyl iron composite separated by a thin amorphous alloy slice is prepared. This sandwich absorber has a broad absorption band due to the summation of two strong absorption peaks. The absorption with RL ≤ − 10 dB is achieved from 6.3 to 18.0 GHz with an absorber thickness of 2.1 mm.