Open AccessPolarization-independent broadband meta-surface for bifunctional antenna
Author(s) -
Tong Cai,
Guangming Wang,
HeXiu Xu,
Shiwei Tang,
JianGang Liang
Publication year - 2016
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.022606
Subject(s) - optics , broadband , bandwidth (computing) , resonator , polarization (electrochemistry) , beam steering , antenna gain , computer science , radiation pattern , physics , electronic engineering , materials science , antenna efficiency , antenna (radio) , beam (structure) , engineering , telecommunications , chemistry
Functional integration is crucial and has become a research interest in recent years; however, available efforts suffer from low efficiency and narrow operating bandwidth. Here, we propose a novel strategy to design bifunctional meta-surface with high efficiency and largely enhanced bandwidth in reflection geometry. For demonstration, we designed and fabricated a bifunctional meta-surface which enables both focusing and anomalous reflection under different polarizations. The working bandwidth is significantly extended by using the dual-resonant three-turn meander-line resonator (TMLR) element which provides an almost consistent phase response within a large frequency interval. For potential applications, we engineered a bifunctional antenna by launching the designed meta-surface with proper feed sources. Numerical and experimental results coincide well, indicating bifunctionalities of high gain pencil-beam radiation (reflectarray) and beam steering radiation with comparable performances. Our results can stimulate the realizations of high-performance meta-surfaces and antenna systems.