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Sci Rep. 2018 Aug 2;8(1):11632. doi: 10.1038/s41598-018-29896-4.

Ultra-subwavelength thickness for dual/triple-band metamaterial absorber at very low frequency.

Author information

1
Department of Physics and RINS, Hanyang University, Seoul, Korea.
2
Department of Display Information, Sunmoon University, Asan, Korea.
3
Department of Physics, Sungkyunkwan University, Suwon, Korea.
4
Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi, Vietnam.
5
Infovion Co., Seoul, Korea.
6
Department of Physics and RINS, Hanyang University, Seoul, Korea. yplee@hanyang.ac.kr.

Abstract

An integrated model utilizing external parasitic capacitors for a dual-band metamaterial perfect absorber (DMPA) is proposed and demonstrated in the UHF radio band. By adjusting the lumped capacitors on a simple meta-surface, the thickness of absorber is reduced to be only 1/378 and 1/320 with respect to the operating wavelength at 305 and 360.5 MHz, respectively. The simulations and the experiments confirm that the DMPA can maintain an absorption over 91% in a wide range of incident angle (up to 55°) and independent of the polarization of incident radiation. Additionally, we examine the integrated model for smaller dual-band absorber and absorption performance at higher frequencies (LTE band). Finally, we consolidate our approach by fabricating an ultrathin triple-band perfect absorber miniaturized to be only 1/591 of the longest operating wavelength. Our work is expected to contribute to the actualization of metamaterial-based devices working at radio frequency.

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