Open AccessWide‐angle and polarisation‐independent tri‐band dual‐layer microwave metamaterial absorber
Author(s) -
Kaur Kanwar Preet,
Upadhyaya Trushit
Publication year - 2018
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.2017.0990
Subject(s) - materials science , microwave , optics , dielectric , absorption (acoustics) , metamaterial absorber , metamaterial , transverse plane , tunable metamaterials , optoelectronics , physics , structural engineering , quantum mechanics , engineering
In this study, a novel dual‐layer wide‐angle metamaterial absorber with polarisation independence has been presented at three distinct frequencies. The proposed structure consists of dual stacked metal‐dielectric layers which are terminated by the metal ground panel. The unit cell of the presented structure consists of three concentric 8‐point star rings on the top surface of both dielectric layers exhibiting three absorption peaks of 98.96%, 98.7% and 99.43% under normal incidence at 1.8 GHz, 2.14 GHz and 2.57 GHz, respectively. The polarisation independence of the design has been validated by numerical simulation and practically verified using waveguide measurement technique. The structure displays high absorption of about 84% for transverse electric polarisation and over 97% under transverse magnetic polarisation up to 60° of oblique incidence. Furthermore, the effects of variation in physical design parameters on absorption response are investigated. The measurement exhibits good agreement with the simulated outcome. The presented structure has a thickness of 0.0294 λ 0 with respect to the lower absorption band frequency.