Open AccessCompact multi‐band polarisation‐insensitive metamaterial absorber
Author(s) -
Chaurasiya Devkinandan,
Ghosh Saptarshi,
Bhattacharyya Somak,
Bhattacharya Anamiya,
Srivastava Kumar Vaibhav
Publication year - 2016
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2015.0220
Subject(s) - metamaterial absorber , materials science , metamaterial , ground plane , optics , absorption (acoustics) , transverse plane , dielectric , electromagnetic compatibility , polarization (electrochemistry) , optoelectronics , physics , tunable metamaterials , telecommunications , chemistry , composite material , structural engineering , quantum mechanics , computer science , antenna (radio) , engineering
In this study, a novel multi‐band metamaterial absorber has been proposed which is ultra‐thin, compact, polarisation‐insensitive and wide‐angle absorptive. The proposed structure comprises two concentric metallic rings printed on a dielectric substrate which is backed by a metal ground plane. The proposed structure exhibits four distinct absorption peaks at 4.11, 7.91, 10.13 and 11.51 GHz with peak absorptivities of 98.81, 99.68, 99.98 and 99.34%, respectively, under normal incidence. The designed absorber is polarisation insensitive due to four‐fold symmetry, which has been confirmed by simulation and measurement studies. Moreover, the structure shows high absorption (over 90%) for oblique incident angles up to 45° for both transverse‐electric and transverse‐magnetic polarisations. The surface current distributions at the four absorption frequencies have been illustrated to explain the absorption mechanism of the structure. In addition, several parametric variations are performed to observe the effects of the geometrical dimensions on the absorption performance. The free space measurement method has been utilised to measure the responses of the fabricated structure, which are in good agreement with the simulated results. The proposed ultra‐thin (∼0.013 λ 0 thin corresponding to lowest absorption frequency) absorber is anticipated to be useful in various potential applications like stealth technology, electromagnetic interference, electromagnetic compatibility and wireless communication.