Title :
A new planar grating-reflector antenna
Author_Institution :
Chalmers Univ. of Technol., Goteborg, Sweden
Abstract :
A planar grating-reflector antenna that consists of a feed horn and a planar reflector composed of a frequency scanned reflection grating has been developed. The antenna concept has been investigated theoretically and experimentally by the design and test of an antenna operating over the frequency band 9.5-10.5 GHz. The principle of operation is to select a grating geometry such that the first higher-order diffracted wave is propagated. The reflection direction of the diffracted wave depends on the frequency, the illumination angles, and the lattice geometry. The focus feed position for the reflected diffracted field is obtained by allowing a smooth variation of the lattice geometry along the reflector surface. In order to obtain an antenna with a high aperture efficiency, a blazed grating structure was used consisting of an array of passive metallic dipoles etched on a glass-fiber substrate and placed over a ground plane supported by a dielectric spacer. For this structure very high blazing efficiency is possible.<>
Keywords :
diffraction gratings; microwave antennas; reflector antennas; 9.5 to 10.5 GHz; SHF; blazed grating structure; dielectric spacer; dipole array; feed horn; first higher-order diffracted wave; focus feed position; frequency scanned reflection grating; glass-fiber substrate; grating geometry; ground plane; high aperture efficiency; high blazing efficiency; illumination angles; lattice geometry; passive metallic dipoles; planar grating-reflector antenna; planar reflector; reflected diffracted field; reflection direction; Antenna theory; Antennas and propagation; Dielectric substrates; Diffraction; Feeds; Frequency; Geometry; Gratings; Lattices; Reflection;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1990. AP-S. Merging Technologies for the 90's. Digest.
Conference_Location :
Dallas, TX, USA
DOI :
10.1109/APS.1990.115405
