Open AccessDesign and fabrication of a broadband metamaterial absorber based on a dielectric and magnetic hybrid substrate
Author(s) -
Fei Guo,
Du Hongliang,
Shaobo Qu,
Xia Song,
Xu Zhou,
Jingru Zhao,
Hongmei Zhang
Publication year - 2015
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.64.077801
Subject(s) - materials science , metamaterial absorber , broadband , fabrication , metamaterial , dielectric , bandwidth (computing) , optoelectronics , optics , substrate (aquarium) , tunable metamaterials , computer science , telecommunications , physics , medicine , oceanography , alternative medicine , pathology , geology
In this paper, a broadband metamaterial absorber is designed based on a hybrid substrate consisting of the dielectric and magnetic materials. The absorber is composed of the resistance film, dielectric layer, magnetic layer, and metal backboard. Numerical simulation of the absorbing properties is performed by means of the finite-difference time-domain method, and the bandwidth of the reflectivity below -10 dB is optimized by the genetic algorithm. Simulated results indicate that a bandwidth of reflectivity below -10 dB can be achieved over the frequency range from 7.8 to 18 GHz when the thickness of the absorber is only 2.5 mm. The proposed metamaterial absorber has many advantages, such as thin thickness, broadband, and polarization insensitivity. The operation mechanism of the absorber has also been analyzed and discussed within the model of equivalent circuit. In the end, an absorber sample is fabricated based on the design. It is found that the experimental result is well consistent with the design requirements.