NDLI: Phase-center effects on wide-band horn pattern measurements in small anechoic chambers

Content Provider	IEEE Xplore Digital Library
Author	Ramanujam, P. Lopez, L.F. Fermella, L.R. Reynolds, R.L.
Copyright Year	1995
Description	Author affiliation: Hughes Space & Commun. Co., Los Angeles, CA, USA (Ramanujam, P.; Lopez, L.F.; Fermella, L.R.; Reynolds, R.L.)
Abstract	The use of large feed horns is well known, with reference to satellite ground station reflector antennas. These antennas essentially produce high gain pencil beams. Due to the use of shaped reflectors for satellite contour beam applications there is renewed interest in large primary feeds such as corrugated horns, trifurcated horns and pyramidal horns. Due to the sensitivity of the large contour beams with reference to the incident feed illumination, it is necessary to characterize these primary feeds very accurately. The theoretical radiation patterns are used for synthesizing the shape of the reflector. Once the shaped reflector is fabricated, very limited mechanisms are available in a shaped reflector system to compensate for the imperfections in the measured feed radiation pattern. Thus, it is necessary to verify the feed radiation patterns in amplitude and phase by measurements before integrating the feed with the shaped reflector. This paper discusses a few precautions to be undertaken while carrying out radiation pattern measurements on these large feeds. In many C-band shaped reflector antennas the feeds are required to operate over the transmit (3.6-4.2 GHz) and receive (5.85-6.425 GHz) bands. These feeds are about about 10 to 15" in diameter and are characterized by large variations in phase centers over the frequency band. This variation leads to an interesting phenomena while carrying out measurements in small anechoic chambers which are commonly used for feed horn measurements. The variation in phase centers requires a correction to the measured radiation pattern which is described. Failure to do so will lead to erroneous radiation patterns as illustrated.
Starting Page	1742
Ending Page	1745
File Size	209442
Page Count	4
File Format	PDF
ISBN	0780327195
DOI	10.1109/APS.1995.530920
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-06-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wideband Phase measurement Antenna radiation patterns Antenna measurements Reflector antennas Antenna feeds Shape measurement Satellite ground stations Horn antennas Satellite antennas
Content Type	Text
Resource Type	Article

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