Title :
A photonic bandgap (PBG) structure for guiding and suppressing surface waves in millimeter-wave antennas
Author :
Park, Young-Jin ; Herschlein, Alexander ; Wiesbeck, Werner
Author_Institution :
Inst. fur Hochfrequenztechnik und Elektronik, Karlsruhe Univ., Germany
fDate :
10/1/2001 12:00:00 AM
Abstract :
Periodic and regular metal posts, a photonic bandgap (PBG) structure for guiding surface waves in a parallel-plate waveguide is proposed. The isotropic PBG structure is applied to the design of an asymmetric parallel-plate waveguide Luneburg lens (APWLL). The relation between the dimensions of the metal posts and the required refraction index in the lens is derived with transmission-line theory and the transverse resonance method. Different lattices for the entire lens are also investigated. For verification, an antenna for a 76.5 GHz adaptive-cruise control radar is fabricated, consisting of an APWLL, a primary feed, and symmetric corrugated flares to improve the property of the antenna in elevation. Measured results verify the PBG structure design in the APWLL
Keywords :
lens antennas; millimetre wave antennas; parallel plate waveguides; photonic band gap; radar antennas; refractive index; road vehicle radar; waveguide antennas; 76.5 GHz; APWLL; Luneburg lens; adaptive-cruise control radar; asymmetric parallel-plate waveguide; isotropic PBG structure; millimeter-wave antennas; periodic metal posts; photonic bandgap structure; primary feed; refraction index; regular metal posts; surface waves; symmetric corrugated flares; transmission-line theory; transverse resonance method; Adaptive arrays; Antenna feeds; Lenses; Optical design; Optical refraction; Periodic structures; Photonic band gap; Radar antennas; Surface waves; Transmission lines;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
