Abstract

Microwave absorber with broadband absorption and thin thickness is one of the main research interests in this field. A flexible ultrathin and broadband microwave absorber comprising multiwall carbon nanotubes, spherical carbonyl iron, and silicone rubber is fabricated in a newly proposed pyramidal spatial periodic structure (SPS). The SPS with equivalent thickness of 3.73 mm covers the $-10\mathrm{dB}$ and $-15\mathrm{dB}$ absorption bandwidth in the frequency range 2–40 GHz and 10–40 GHz, respectively. The excellent absorption performance is achieved by concentration and dissipation of the electromagnetic field inside different parts of the magnetic–dielectric lossy protrusions in different frequency ranges.

© 2018 Optical Society of America

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