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Bandwidth‐enhancement of an ultrathin polarization insensitive metamaterial absorber
Author(s) -
Ghosh Saptarshi,
Bhattacharyya Somak,
Srivastava Kumar Vaibhav
Publication year - 2014
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28122
Subject(s) - metamaterial absorber , microwave , materials science , metamaterial , polarization (electrochemistry) , optics , bandwidth (computing) , dielectric , optoelectronics , absorption band , tunable metamaterials , physics , telecommunications , chemistry , engineering
An ultrathin polarization insensitive microwave metamaterial absorber is discussed, which consists of a periodic array of swastika‐like structure printed on FR4 dielectric substrate backed by copper ground. The structure is simulated to give rise to nearly unity (99.64%) absorption at 10.10 GHz (X‐band). The proposed structure is symmetric in nature and provides high absorption for any angle of polarization under normal incidence. It also shows high absorption (∼81%) for incident angle upto 60 o . Further, a 2 × 2 array using two different variants of the same resonating structure has been studied and by optimizing its geometrical dimensions, the absorption peaks are brought closer to provide an enhanced bandwidth having full width at half maximum of 0.68 GHz (10.04–10.72 GHz). Both the single‐band and bandwidth‐enhanced structures are then fabricated and experimentally studied which shows good agreement with the simulated results. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:350–355, 2014