Bài báo khoa học

A simple design of a novel co-polarization wideband metamaterial absorber (MA) for C-band applications is proposed and numerical investigated. The unit cell of the proposed MA is designed by combining the haft-moon shaped resonator (HMSR) and interior circle resonator (ICR) structures, based on FR4 substrate. The absorption performances of the proposed absorber are numerical investigated. The proposed absorber achieves the co-polarization absorptivity higher than 90% covering the entire C-band from 3.95 GHz to 8.02 GHz under normal incidence for transverse electric (TE) and transverse magnetic (TM) polarizations. Moreover, the average absorption can be maintained above 80% even for incident angles up to 60o under both TE and TM polarizations. The physical mechanism of the proposed MA is investigated by using the electric and surface current distributions, which is also supported by the retrieved constitutive electromagnetic parameters. The design in this work is a compact structure (unit cell dimension of ~λ/6.5 and thickness of ~λ/11.8 at the center frequency), broadband, and wide incident angle insensitivity, which can be applications in the C-band defense and stealth systems.