期刊
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
卷 18, 期 5, 页码 1016-1020出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2019.2907780
关键词
Broadband microwave absorption; metamaterial absorber (MMA)
资金
- Natural National Science Foundation of China [61571186, 61378002]
- Key Research and Development Plan of Hunan Province [2017NK2121]
The absorption of conventional metamaterial absorbers (MMAs), originating from the electric or magnetic resonance induced ohmic loss, usually has a narrow bandwidth because of the limited surface resistance of the structured metal layers. In this letter, we experimentally demonstrate a broadband MMA by using graphite instead of copper to construct the surface pattern structure. Compared with metals, the graphite has a low electric conductivity, and its skin depth is far more than those of metals. As a result, the effective thickness of our graphite-based absorber, which determines the thickness-dependent resonance, is very sensitive to the thickness of the structured graphite layer. Due to the relatively large surface resistance and the sensitive tunable thickness-dependent resonance, our design achieves an absorption bandwidth (less than -10 dB) from 12.7 to 18 GHz. Our results may provide an effective way to tune the thickness-dependent resonance and to broaden the absorption bandwidth of MMA.
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