Multiple phase center performance of reflector antennas using a dual mode horn

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dc.contributor.authorShafai, L
dc.contributor.authorSharma, SK
dc.contributor.authorBalaji, B
dc.contributor.authorDamini, A
dc.contributor.authorHaslam, G
dc.date.accessioned2007-10-03T12:57:12Z
dc.date.available2007-10-03T12:57:12Z
dc.date.issued2006-11-30T12:57:12Z
dc.description.abstractA new application for reflector antennas is proposed and developed. Using the aperture theory, a phase center on the reflector aperture is determined and shown that, its location is dependent on the field distribution. The proposed concept is, initially, verified by using a symmetric reflector. It is shown that the phase center is located at the aperture geometric center, when the reflector is illuminated symmetrically about its principal planes. Then, a dual mode feed, employing TE11 and TM01 modes, is used for generating different reflector illuminations, and causing displacement of its phase center. The concept is then extended to offset reflectors, and the influence of the reflector geometry on the phase center displacement and other reflector electrical parameters is investigated. Based on the established feed radiation pattern requirements, a feed horn is designed using circular waveguide that can propagate both modes. By modifying the amplitude and phase of the modes in the horn, a controlled asymmetric reflector aperture field is achieved. A prototype feed horn is fabricated and tested for its dual mode radiation patterns. The results are in good agreement with simulations. The reflector phase center properties are then investigated, by using the designed feed. A reflector-feed assembly, with its dual phase center capability, was developed for improving the performance of the ground moving target indicator radars. The concept allows the conversion of a single reflector to two or more reflectors, simply by modifying the mode excitation amplitudes and phases, in the feed alone.en
dc.format.extent2816459 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.citation0018-926X; IEEE TRANS ANTENNAS PROPAGAT, NOV 2006, vol. 54, no. 11, p.3407 to 3417.en
dc.identifier.doihttp://dx.doi.org/10.1109/TAP.2006.884236
dc.identifier.urihttp://hdl.handle.net/1993/2855
dc.language.isoengen_US
dc.rights©2006 IEEE. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Manitoba's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.en
dc.rightsrestricted accessen_US
dc.statusPeer revieweden
dc.subjectbeam shiften
dc.subjectdual modeen
dc.subjectfeed hornen
dc.subjectground moving target indicator (GMTI) radaren
dc.subjectmultiple phase centeren
dc.subjectreflector antennaen
dc.titleMultiple phase center performance of reflector antennas using a dual mode hornen
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