Cross-Polarization Cancellation in an Offset Parabolic Reflector Antenna Using a Corrugated Matched Feed

Author

Sharma, S.B. ; Pujara, Dhaval ; Chakrabarty, S.B. ; Dey, Ranajit

Author_Institution

Space Applic. Centre (SAC), Indian Space Res. Organ. (ISRO), Ahmedabad, India

Volume

8

fYear

2009

fDate

7/1/1905 12:00:00 AM

Firstpage

861

Lastpage

864

Abstract

This letter presents the design of a dual-mode corrugated matched feed to cancel the unwanted high cross polarization and beam squinting in an offset parabolic reflector antenna. The matched feed concept has been implemented in a cylindrical corrugated structure by adding a higher order HE₂₁ mode to the fundamental HE₁₁ mode. The designed feed was then used to illuminate a linearly, as well as a circularly, polarized offset parabolic reflector antenna, and the secondary radiation patterns were computed. Significant improvement in the cross polarization was observed when the results were compared to that of a conventional corrugated horn illuminated offset reflector antenna.

Keywords

antenna radiation patterns; electromagnetic wave polarisation; offset reflector antennas; reflector antenna feeds; HE₁₁ mode; HE₂₁ mode; beam squinting; cross-polarization cancellation; cylindrical corrugated structure; dual-mode corrugated matched feeds; electromagnetic wave polarization; offset parabolic reflector antenna; secondary radiation patterns; Corrugated horn; cross polarization; matched feed; offset reflector antenna;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2009.2027913

Filename

5170006