Feed-Reflector design for large adaptive reflector antenna (LAR)

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dc.contributor.authorMousavi, P
dc.contributor.authorShafai, L
dc.contributor.authorVeidt, B
dc.contributor.authorDewdney, P
dc.date.accessioned2007-10-04T15:00:23Z
dc.date.available2007-10-04T15:00:23Z
dc.date.issued2001-08-31
dc.description.abstractA novel Feed-Reflector system for large Cassegrain antennas of radio astronomy and deep-space communication applications is investigated. This Feed-Reflector is used to illuminate a hyperboloid subreflector with a 5-10 m diameter located 500 m above the ground. Because the subreflector is located in the near field of the Feed-Reflector antenna, a theory based on the near field focusing properties of paraboloid reflectors is established. The focusing at near distance is formed by moving the feed horn away from the focal point of the Feed-Reflector. In this theory, the properties of axial defocused paraboloid reflectors at near distance are investigated in more detail. By using equivalence path law, the subreflector shape is obtained. It is found that the hyperbola can approximate the subreflector well. A detailed ray tracing is performed on the entire system which reveals that the feed system uses some part of the subreflector three times. The gain, side lobe level, cross polarization, and aperture distribution are calculated for different feed horn locations and taper at the edge of the Feed-Reflector and also for different sizes and eccentricities of the subreflector. Peak efficiency in excess of 74.8% and side lobe level around -20 dB are obtained for unshaped system. The performance of the system over the operating band (1-22 GHz) is also studied and shown that the lower-frequency limit is dependent on subreflector and Feed-Reflector sizes.en
dc.format.extent380504 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.citation0018-926X; IEEE TRANS ANTENNAS PROPAGAT, AUG 2001, vol. 49, no. 8, p.1142 to 1154.en
dc.identifier.doihttp://dx.doi.org/10.1109/8.943309
dc.identifier.urihttp://hdl.handle.net/1993/2873
dc.language.isoengen_US
dc.rights©2001 IEEE. 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 to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.en
dc.rightsrestricted accessen_US
dc.statusPeer revieweden
dc.subjectaperture antennaen
dc.subjectnearfielden
dc.subjectradio telescopeen
dc.subjectrelector antennaen
dc.subjectSERIESen
dc.titleFeed-Reflector design for large adaptive reflector antenna (LAR)en
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