Open AccessTilted‐beam MPA with broad‐useful bandwidth
Author(s) -
Chacko Bybi Puthenkalapurayil,
Augustin Gijo,
Denidni Tayeb A.
Publication year - 2017
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.2016.0237
Subject(s) - optics , bandwidth (computing) , materials science , refractive index , microstrip antenna , beam (structure) , microstrip , beam diameter , optoelectronics , antenna (radio) , physics , engineering , telecommunications , laser , laser beams
A low‐profile, beam tilted microstrip patch antenna (MPA) with broad‐useful bandwidth and improved gain is presented. The proposed design comprises of a rectangular MPA and a square‐loop unit‐cell‐based metasurface superstrate with different effective refractive index regions. The beam tilting is achieved by the phenomenon of phase difference produced by the superstrate having different refractive index regions. The experimental results display a maximum beam tilt of 27° in the E ‐plane at 5 GHz with a slight frequency dependability of 0.013°/MHz. The proposed design also offers a broad‐useful bandwidth of 11% centred at 4.82 GHz, while maintaining relatively low antenna height of 0.06 λ . Moreover, uniform field distribution due to superstrate provides a maximum gain of 8.4 dBi with a variation ≤1.3 dB.