Determination of array feed excitation to improve performance of distorted or scanned reflector antennas

Author

Bailey, M.C.

Author_Institution

NASA Langley Res. Center, Hampton, VA, USA

fYear

1991

fDate

24-28 June 1991

Firstpage

175

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 1991. AP-S. Digest

Conference_Location

London, Ontario, Canada

Print_ISBN

0-7803-0144-7

Type

conf

DOI

10.1109/APS.1991.174801

Filename

174801