Abstract
We propose an absorber design method based on the equivalent circuit model and impedance matching theory, and verify its capability by designing an ultra-wideband fractal disc metamaterial absorber. In this paper, we calculated the absorption characteristics and electromagnetic field distribution by using the finite-difference time-domain method. The numerical results show that the absorption band of the absorber ranges from 300 nm to 6000 nm with an average absorption rate of 97.4%. The proposed absorber has a bandwidth of 5700 nm with an absorption rate greater than 90%, and the analysis of the arbitrary polarization angle shows that the absorption rate is insensitive to the polarization angle. For TM and TE waves with large angular oblique incidence, the average absorption still exceeds 85%. The wideband and high absorption is mainly attributed to surface plasmon resonance, localized surface plasmon resonance, slow-wave effects, and their interactions. An absorber with ultra-wide absorption band, high absorbance, insensitivity to polarization, and wide-angle absorption has potential applications in solar energy harvesting, optical communication, and invisibility devices.
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