Journal
WAVES IN RANDOM AND COMPLEX MEDIA
Volume 27, Issue 2, Pages 381-391Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/17455030.2016.1250974
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Funding
- Natural Science Basic Research Plan in Shaanxi Province [2013KJXX-66, BD11015020008]
- Technology Innovation Research Project of the CETC
- Fundamental Research Funds for the Central Universities [SPSZ031410]
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In this paper, an ultra-broadband, wide-angle polarization-insensitive metamaterial absorber is designed at microwave frequencies. The absorber consists of a periodic array of metallic strips with the lumped resistances fabricated on a dielectric substrate with a ground plane. The proposed absorber is single-layered and symmetric, thus leading to very thin and polarization-insensitive characteristics. According to the surface current distributions, the proposed absorber can operate three resonant modes including two dipole resonances and an LC resonance. By adjusting the geometry and lumped resistances of the structure, three resonant modes can be effectively connected together, and thus an ultra-broadband response can be realized. The simulated and experimental results demonstrate that the proposed absorber produces a good absorption above 80% at normal incidence and above 60% at oblique incidence with the incident angle smaller than 45 degrees between 6 and 16.2 GHz.
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