Abstract
We report a numerical study on the design of a broadband metamaterial absorber (MMA) with a single layer of metal–dielectric–metal based on an FR-4 substrate for X-band applications. The MMA structure consists of a periodic array of a split circle ring and lumped resistors coupled within split segments. The MMA structure achieves a broadband absorption response in the frequency range of 7.8–12.6 GHz with an absorptivity of above 90% under normal incidence for all polarization angles. The absorptivity remains above 70% in the frequency range of 6.8–11.8 GHz at wide incident angles from 0° to 30° for both transverse electric and transverse magnetic polarizations. The physical mechanism of the absorber is explained by the electric and the surface current distributions that, in turn, are significantly affected by magnetic resonance.
Highlights
Metamaterial absorbers (MMAs) have been extensively studied for various applications such as sensors, solar cells, and electromagnetic interference (EMI) and radar cross section (RCS) reduction1–6 ever since a thin perfect microwave MMA was reported by Landy et al in 2008.7 in reality, the design of MMAs for a suitable operating frequency band, a reasonable bandwidth, wide-angle tolerance, polarization insensitivity, a low profile, and an easy fabrication process is challenging
We report a numerical study on the design of a broadband metamaterial absorber (MMA) with a single layer of metal–dielectric–metal based on an FR-4 substrate for X-band applications
The MMA structure consists of a periodic array of a split circle ring and lumped resistors coupled within split segments
Summary
Metamaterial absorbers (MMAs) have been extensively studied for various applications such as sensors, solar cells, and electromagnetic interference (EMI) and radar cross section (RCS) reduction1–6 ever since a thin perfect microwave MMA was reported by Landy et al in 2008.7 in reality, the design of MMAs for a suitable operating frequency band, a reasonable bandwidth, wide-angle tolerance, polarization insensitivity, a low profile, and an easy fabrication process is challenging. The MMA structure achieves a broadband absorption response in the frequency range of 7.8–12.6 GHz with an absorptivity of above 90% under normal incidence for all polarization angles.
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