NDLI: The higher order modes in the feeds of the satellite monopulse tracking antennas

Content Provider	IEEE Xplore Digital Library
Author	Sakr, L.
Copyright Year	2002
Description	Author affiliation: Dev. & Training Sector, "Nilesat Co." The Egyptian Satellite Co, 6th October City, Egypt (Sakr, L.)
Abstract	Corrugated horns have been widely applied as optimum feeds for reflector antennas due to the characteristics associated with their rotationally symmetric radiation field patterns which have very low side lobe and cross-polar levels. Most ground stations now use Cassegrain antennas with conical corrugated feed horns for satellite tracking and control as they are optimum systems which can support high gains, better efficiencies, and low cross-polar components. These systems utilize the hybrid HE/sub 11/ mode for the main signal and one or two of the following modes, TM/sub 01/, TE/sub 01/, (HE/sub 21/ or TE/sub 21/) for creation of the error signals that are used by the automatic tracking units to derive the angular tracking information. The antenna systems use both the TM/sub 01/ and TE/sub 01/ modes for monopulse tracking. Nearly all the antenna systems now extract the tracking information from the HE/sub 21/ or TE/sub 21/ modes in corrugated or in smooth waveguides respectively. The. tracking mode sensor extracts the higher-order-mode signal from a circular overmoded waveguide section following the corrugated antenna feed. It is explained how the tracking information can be extracted from the HE/sub 21/ or TE/sub 21/ signals.
Starting Page	453
Ending Page	457
File Size	300044
Page Count	5
File Format	PDF
ISBN	0780375270
DOI	10.1109/MELECON.2002.1014634
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-05-07
Publisher Place	Egypt
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Satellite antennas Antenna feeds Tellurium Helium Data mining Horn antennas Reflector antennas Satellite ground stations Antenna accessories Control systems
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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