Open AccessW‐band flat lens antenna with compact size and broadband performance
Author(s) -
Liu Shi Lin,
Lin Xian Qi,
Lan Jian Yu,
He Xiao Bin
Publication year - 2020
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.2019.0654
Subject(s) - optics , lens (geology) , radiation pattern , antenna factor , antenna (radio) , materials science , antenna efficiency , antenna gain , horn antenna , antenna measurement , physics , slot antenna , engineering , electrical engineering
A broadband short‐length lens antenna operating in W band is presented in this study. The lens is composed of a dielectric host material with numerous variable square holes drilling on it, which is fabricated using the three‐dimensional printing method with high accuracy and low cost. Then, the lens is mounted directly on the end of a length‐shortened horn antenna, obtaining a compact lens antenna. Phase variations of the dielectric unit‐cell under different oblique incidences are taken into consideration while constructing the lens. Simulation results reveal that gain enhancement of about 1 dB is achieved compared with the designs using the conventional method. Effects of lens height on antenna radiation performances are also studied and the lens profile is reduced to half with little performances deterioration. For the total lens antenna, a maximum gain of 23.2 dBi is measured at 94 GHz, which reveals 7.4 dB gain enhancement compared with the feed source. The measured 1 and 3 dB gain bandwidths are 13.8 and 37.8%, respectively. The proposed lens antenna shows a profile reduction of 42.3% with respect to the optimum horn while exhibiting comparable gain performance within a broad frequency band.