Title :
A sliced spherical Luneburg lens
Author :
Rondineau, Sébastien ; Himdi, Mohamed ; Sorieux, Jacques
Author_Institution :
Dept. of Electr. & Comput. Eng., Colorado Univ., Boulder, CO, USA
fDate :
6/25/1905 12:00:00 AM
Abstract :
The Luneburg lens (LL) represents a very attractive candidate for many applications such as multibeam antennas, multifrequency scanning, and spatial scanning, due to its focusing properties. Indeed, it is a dielectric sphere on which each surface point is a frequency-independent perfect focusing point. This is produced by its index governing law n, which follows the radial distribution n/sup 2/=2-r/sup 2/, where r is the normalized radial position. Practically, an LL is manufactured as a finite number of concentric homogeneous dielectric shells - this is called a discrete LL. The inaccuracies in the curved shell manufacturing process produce intershell air gaps, which degrade the performance of the lens. Furthermore, this requires different materials whose relative dielectric constant covers the range 1-2. The paper proposes a new LL manufacturing process to avoid these drawbacks. The paper describe the theoretical background and the performance of the obtained lens.
Keywords :
antenna feeds; dielectric bodies; dielectric devices; lens antennas; manufacturing processes; permittivity; 26.5 to 40.0 GHz; dielectric sphere; effective permittivity; focusing properties; homogeneous dielectric shells; manufacturing process; multibeam antennas; multifrequency scanning; open-ended waveguide feed; relative dielectric constant; sliced spherical Luneburg lens; spatial scanning; Costs; Dielectric materials; Drilling; Least squares approximation; Lenses; Manufacturing; Optical design; Optical materials; Permittivity; Prototypes;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2003.819045