NDLI: Enhancing multiple-aperture Ka-band Navy SATCOM antennas with electronic tracking and reflectarrays

Content Provider	IEEE Xplore Digital Library
Author	Felstead, E.B. Shaker, J. Chaharmir, M.R. Petosa, A.
Copyright Year	2002
Description	Author affiliation: Commun. Res. Centre, Ottawa, Ont., Canada (Felstead, E.B.; Shaker, J.; Chaharmir, M.R.; Petosa, A.)
Abstract	In naval SATCOM applications, there are advantages to using multiple antenna panels, each of limited scan range covering only a portion of the required hemisphere. For mechanical steering, the depth of each panel can be reduced by dividing the required aperture into multiple, smaller, sub-apertures at the cost of needing coherent combining. Two enhancements to multiple sub-aperture systems are presented. First, a method, akin to radar monopulse tracking techniques, is introduced that uses the multiple sub-beams for fine acquisition and tracking of the downlink signal. The individual sub-beams are steered to point slightly off center. A portion of the downlink signal from each beam is tapped off, detected, and used in an algorithm to compute the pointing error of the combined antenna beam center. This error estimate is used in a feedback loop to track the downlink signal. In the second enhancement, the sub-aperture antennas are implemented using reflectarray reflectors. Printed reflectarrays are used in place of conventional parabolic dishes. To minimize the design complexity of the feeds, the reflectarray elements are designed to transform the linear polarization from the feeds to circular polarization. The reflectarray design is capable of handling both right-hand and left-hand circular polarization. Furthermore, the reflectarray is designed with separate focal points for the transmit and receive signals. This removes the need for an orthomode transducer and for diplexers, resulting in considerable cost and weight savings. A Ka-band implementation is described.
Sponsorship	IEEE
Starting Page	168
Ending Page	172
File Size	655460
Page Count	5
File Format	PDF
ISBN	0780376250
DOI	10.1109/MILCOM.2002.1180434
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-10-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Reflector antennas Radar tracking Downlink Polarization Costs Feeds Apertures Radar detection Feedback loop Tracking loops
Content Type	Text
Resource Type	Article

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