NDLI: Tri-Mode Horn Feeds Revisited: Cross-Pol Reduction in Compact Offset Reflector Antennas

Content Provider	IEEE Xplore Digital Library
Author	Bahadori, K. Rahmat-Samii, Y.
Copyright Year	1963
Abstract	The design of a tri-mode horn feed with novel structure is revisited in this communication. This design allows a significant reduction in the cross-pol level in the far-field patterns of linearly polarized offset parabolic reflector antennas with low F/D. This is, in particular, advantageous in spaceborne applications where the space and weight is limited. It is demonstrated that TE₂₁ mode in conical horns possesses a similar aperture field distribution as the focal plane field of an offset reflector antenna and can reduce the cross-pol level if the mode coefficients are optimized. The complex mode coefficients are optimized for a particular application of a 4.5 m offset reflector antenna operating at 10 GHz with F/D = 0.4. It is shown that the cross-pol level is reduced dramatically (~28 dB over 3% of bandwidth) when the reflector is fed by the tri-mode horn with optimum coefficients. The results suggest that this design could be very useful for future narrow band spaceborne remote sensing applications.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	2771
Ending Page	2775
Page Count	5
File Size	655541
File Format	PDF
ISSN	0018926X
Volume Number	57
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Horn antennas Reflector antennas Antenna feeds Dielectric losses Bandwidth Remote sensing Lenses Polarization Aperture antennas Narrowband parabolic reflector antennas Cross-pol horn offset reflector antennas
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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