Reducing crosspolarization of an offset reflector antenna using a dual-mode horn feed

Author

Pour, Z. Allahgholi ; Shafai, L.

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Manitoba, Winnipeg, MB

fYear

2009

fDate

15-18 Feb. 2009

Firstpage

1

Lastpage

4

Abstract

The effect of a dual-mode circular horn antenna, as a feed in offset reflector antennas, on the crosspolarization field is studied using the physical optics, geometrical optics, and geometrical theory of diffraction software GRASP. It will be shown that, one can reduce the crosspolarization of an offset reflector antenna by properly exciting two modes in circular horn antenna. These two modes are the fundamental mode, TE₁₁, and the higher order mode, TE₂₁. The results for some offset reflectors, with different f/D ratios, will be presented to investigate the above property.

Keywords

electromagnetic wave polarisation; geometrical optics; geometrical theory of diffraction; horn antennas; offset reflector antennas; physical optics; reflector antenna feeds; crosspolarization field; dual-mode circular horn feed; geometrical optics; geometrical theory-of-diffraction software GRASP; offset reflector antenna; physical optics; Antenna arrays; Antenna feeds; Apertures; Current distribution; Geometry; Horn antennas; Paper technology; Phased arrays; Power generation; Reflector antennas; Reflector antennas; crosspolarization; multimode horn;

fLanguage

English

Publisher

ieee

Conference_Titel

Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting, 2009. ANTEM/URSI 2009. 13th International Symposium on

Conference_Location

Toronto, ON

Print_ISBN

978-1-4244-2979-0

Electronic_ISBN

978-1-4244-2980-6

Type

conf

DOI

10.1109/ANTEMURSI.2009.4805041

Filename

4805041