Title :
Off-Axis Performances of Half Maxwell Fish-Eye Lens Antennas at 77 GHz
Author :
Fuchs, Benjamin ; Lafond, Olivier ; Rondineau, Sébastien ; Himdi, Mohamed ; Le Coq, Laurent
Author_Institution :
Electron. & Telecommun. of Rennes, Rennes I Univ.
Abstract :
The off-axis performances at 77 GHz of multilayered half Maxwell fish-eye (HMFE) lenses fed by an open-ended waveguide is describes. When moving the feed with respect to (w.r.t.) the lens, it is shown that at least 40deg of scanning can be achieved. Several off-axis configurations of the lens antenna are investigated and compared using a full-wave electromagnetic software. The directivity, far field pattern and scan angle of the lens antenna are reported for a rectilinear and angular off-axis displacement of the feed and also for various distances between the feed and the lens. It is also shown that a three-shell lens is good enough to achieve a wide scan angle. Finally, off-axis measurements done with a three-shell 6.15 lambda0-diameter HMFE lens antenna are compared to computed results to validate the simulations
Keywords :
antenna feeds; antenna radiation patterns; computational electromagnetics; lens antennas; millimetre wave antennas; millimetre wave measurement; scanning antennas; waveguide antennas; 77 GHz; HMFE; antenna feed; directivity; far field pattern; full-wave electromagnetic software; half maxwell fish-eye lens antenna; off-axis measurement; open-ended waveguide; rectilinear displacement; scan angle; three-shell lens; Artificial satellites; Automotive engineering; Computational modeling; Feeds; Frequency; Lenses; Millimeter wave communication; Permittivity; Radar antennas; Spaceborne radar; Automotive radars; lens antennas; millimeter-wave antenna; multiple-beam antennas;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2006.886576
