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

• Published in: Scientific reports 2018-08, Vol.8 (1), p.11632-9, Article 11632
• Main Authors: Khuyen, Bui Xuan, Tung, Bui Son, Kim, Young Ju, Hwang, Ji Sub, Kim, Ki Won, Rhee, Joo Yull, Lam, Vu Dinh, Kim, Yong Hwan, Lee, YoungPak
• Format: Article
• Language: English
• Subjects: 639/301/1023; 639/705; 639/766/25; Absorption; Humanities and Social Sciences; multidisciplinary; Permeability; Radio frequency identification; Science; Science (multidisciplinary); Wavelength
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-018-29896-4

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.