Title :
Effect of feed cross-polarization on the cross-polar characteristics of a shaped dual reflector antenna
Author :
Arnold, B.H. ; Clancy, K. ; Park, B.M. ; Ramanujam, P.
Author_Institution :
Hughes Space & Commun. Co., Los Angeles, CA, USA
Abstract :
The two common forms of shaped reflector antennas for linear polarization applications are the dual gridded reflector antenna (with two orthogonally polarized surfaces) and a dual reflector antenna with a single surface main reflector and a single surface subreflector. The superior cross-polar performance in a dual gridded reflector is obtained by a combination of the polarizing grid and the separation between the feeds for the two polarizations. In this configuration the feed cross-polarization has a second order effect on the overall cross-polar performance. In a dual reflector antenna, the geometry inherently results in a low cross-polar performance if it satisfies the optimum cross-polar condition. Since the reflector induced cross-polarization is very low, the feed cross-polarization has a significant effect on the overall antenna cross-polar performance. This paper describes the effect of feed cross-polar performance on the antenna cross-polar performance of a shaped dual reflector antenna.
Keywords :
antenna radiation patterns; electromagnetic wave polarisation; offset reflector antennas; reflector antenna feeds; cross-polar characteristics; dual gridded reflector; feed cross-polarization; linear polarization; shaped dual reflector antenna; subreflector; Antenna feeds; Antenna radiation patterns; Degradation; Geometry; Interference; Pattern analysis; Performance gain; Physical optics; Polarization; Reflector antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1997. IEEE., 1997 Digest
Conference_Location :
Montreal, Quebec, Canada
Print_ISBN :
0-7803-4178-3
DOI :
10.1109/APS.1997.631860