Title :
Angular independency of a parallel-plate Luneburg lens with hexagonal lattice and circular metal posts
Author :
Park, Young-Jin ; Wiesbeck, Werner
Author_Institution :
Inst. fur Hochstfrequenztechnik und Elektron., Karlsruhe Univ., Germany
fDate :
6/24/1905 12:00:00 AM
Abstract :
An asymmetric parallel-plate waveguide Luneburg (1964) lens (APWLL) is developed using a periodic regular circular metal post structure, which acts as a metallic artificial dielectric. The effect of metal post shapes and lattices on the angularly independent performance of the structure is investigated and then for the best angular independency a circular metal post shape and a hexagonal lattice are chosen. A prototype APWLL is designed for an adaptive cruise control (ACC) radar at 76-77 GHz. Measurement and simulation show that the structure with a hexagonal lattice and circular metal posts has not only better performance, but also functions as well as an actual isotropic homogeneous dielectric with angular independency.
Keywords :
adaptive control; lens antennas; millimetre wave antennas; parallel plate waveguides; periodic structures; radar antennas; road vehicle radar; 76 to 77 GHz; EHF; adaptive cruise control radar; angular independency; asymmetric parallel-plate waveguide Luneburg lens; automotive radar; hexagonal lattice; isotropic homogeneous dielectric; metal post shapes; metallic artificial dielectric; millimeter-wave antennas; periodic regular circular metal post structure; periodic structure; simulation; Dielectric materials; Dielectric measurements; Frequency; Lattices; Lenses; Millimeter wave radar; Periodic structures; Radar antennas; Shape; Surface waves;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2002.806758
