W-band flat lens antenna with compact size and broadband performance

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...

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Bibliographic Details
Published in:IET microwaves, antennas & propagation antennas & propagation, 2020-08, Vol.14 (10), p.1047-1052
Main Authors: Liu, Shi Lin, Lin, Xian Qi, Lan, Jian Yu, He, Xiao Bin
Format: Article
Language:English
Subjects:
antenna radiation patterns
antenna radiation performances
broad frequency band
broadband performance
broadband short‐length lens antenna
compact lens antenna
compact size
dielectric host material
dielectric unit‐cell
frequency 94.0 GHz
gain bandwidths
gain enhancement
gain performance
horn antennas
length‐shortened horn antenna
lens antennas
lens height
lens profile
lenses
microwave photonics
millimetre wave antennas
performance deterioration
Research Article
three‐dimensional printing method
total lens antenna
variable square holes
W‐band flat lens antenna
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Description
Summary: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.
ISSN:1751-8725
1751-8733
1751-8733
DOI:10.1049/iet-map.2019.0654