Title :
Comparative Design and Analysis of Luneburg and Half Maxwell Fish-Eye Lens Antennas
Author :
Fuchs, Benjamin ; Lafond, Olivier ; Palud, Sébastien ; Coq, Laurent Le ; Himdi, Mohamed ; Buck, Michael C. ; Rondineau, Sébastien
Author_Institution :
Lab. of Electromagn. & Acoust., Ecole Polytech. Fed. de Lausanne, Lausanne
Abstract :
The design and performances is described of half Maxwell fish-eye (HMFE) and Luneburg lens antennas. Techniques to estimate the gradient index lens weights are first proposed and compared to measurements. Thanks to an analytical method based on spherical modal expansion, the radiation performances of Luneburg and HMFE lens antennas are then quantified and compared. The effects of the shell number, the lens diameter and the air gaps on the lens antenna directivity are investigated. Finally, a minmax optimized 9-shell 60 mm-diameter HMFE lens antenna is characterized at both 77 GHz and 110 GHz for on- and off- axis configurations to show its frequency behavior, focalization and beam scanning properties.
Keywords :
lens antennas; Luneburg lens antennas; analytical method; frequency 110 GHz; frequency 77 GHz; gradient index lens weights; half Maxwell fish-eye antennas; spherical modal expansion; Acoustic beams; Air gaps; Antenna measurements; Broadband antennas; Dielectrics; Lenses; Minimax techniques; Optical design; Performance analysis; Permittivity; High directivity; inhomogeneous lenses; lens antennas; millimeter wave antenna;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2008.928818
