Title :
Determination of array feed excitation to improve performance of distorted or scanned reflector antennas
Author_Institution :
NASA Langley Res. Center, Hampton, VA, USA
Abstract :
The performance degradation of distorted and/or scanned reflector antennas is manifested primarily in a decrease in peak gain and in an increase in radiation pattern sidelobes. The author discusses a procedure for determination of the excitation coefficients of the array feed in order to approximate the ´ideal´ performance for both gain and sidelobes. Representative results of 6 GHz are presented for a hexagonal array of 1.5 lambda diameter dual-mode horns with center-to-center spacing of 1.5 lambda , to compensate for the surface distortion of one offset aperture of a mesh deployable reflector antenna.<>
Keywords :
antenna feeders; antenna radiation patterns; reflector antennas; scanning antennas; 6 GHz; SHF; array feed excitation; distorted reflector antenna; dual-mode horns; excitation coefficients; hexagonal array; least squares minimisation; mesh deployable reflector antenna; offset aperture; peak gain; performance degradation; radiation pattern sidelobes; scanned reflector antennas; surface distortion; Antenna arrays; Antenna feeds; Antenna radiation patterns; Apertures; Computer simulation; Degradation; Performance gain; Phase distortion; Phased arrays; Reflector antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1991. AP-S. Digest
Conference_Location :
London, Ontario, Canada
Print_ISBN :
0-7803-0144-7
DOI :
10.1109/APS.1991.174801
