Title :
Experimental shaped reflector antenna
Author_Institution :
Hughes Aircraft Co., El Segundo, CA, USA
Abstract :
A shaped reflector antenna was designed using an aperture synthesis method. The antenna was designed to operate over the Ku band transmit frequencies (11.7 to 12.2 GHz). The design consists of a single Potter horn feeding a 28.34 in by 28.24 in. square aperture shaped reflector with a 26.15 in. effective focal length. It turns out that the phase front for the radiation pattern of the Potter horn feed is not spherical over the angular extent of the reflector. If the Potter horn feed had a true spherical phase front, then the measured phase would be constant, as was assumed in the calculated results. It is also suspected that the variation of this phase with frequency is the cause of the large frequency variation in the measured shaped reflector radiation patterns. Some preliminary work was done in which a shaped reflector radiation pattern was recalculated using a feed model that took into account phase variation.<>
Keywords :
antenna feeders; antenna radiation patterns; microwave antennas; reflector antennas; 11.7 to 12.2 GHz; Ku band; Potter horn feed; SHF; aperture synthesis method; effective focal length; frequency variation; phase front; phase variation; radiation pattern; shaped reflector antenna; square aperture shaped reflector; Aircraft; Antenna feeds; Antenna measurements; Apertures; Frequency measurement; Laboratories; Phase measurement; Reflector antennas; Shape measurement; Structural beams;
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.1990.115404
