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Multiple reflector scanning antennas

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dc.contributor.authorShen, Bingen
dc.contributor.committeechairStutzman, Warren L.en
dc.contributor.committeememberRoper, L. Daviden
dc.contributor.committeememberFicenec, John R.en
dc.contributor.committeememberIndebetouw, Guy J.en
dc.contributor.committeememberArndt, Richard A.en
dc.contributor.departmentPhysicsen
dc.date.accessioned2014-03-14T21:22:02Zen
dc.date.adate2005-10-24en
dc.date.available2014-03-14T21:22:02Zen
dc.date.issued1993en
dc.date.rdate2005-10-24en
dc.date.sdate2005-10-24en
dc.description.abstractNarrow beamwidth antenna systems are important to remote sensing applications and point-to-point communication systems. In many applications the main beam of the antenna radiation pattern must be scannable over a region of space. Scanning by mechanically skewing the entire antenna assembly is difficult and in many situations is unacceptable. Performance during scan is, of course, also very important. Traditional reflector systems employing the well-focused paraboloidal-shaped main reflector accomplish scan by motion of a few feeds, or by phase steering a focal plane feed array. Such scanning systems can experience significant gain loss. Traditional reflecting systems with a spherical main reflector have low aperture efficiency and poor side lobe and cross polarization performance. This dissertation introduces a new approach to the design of scanning spherical reflector systems, in which the performance weaknesses of high cross polarization and high side lobe levels are avoided. Moreover, the low aperture utilization common in spherical reflectors is overcome. As an improvement to this new spherical main reflector configuration, a flat mirror reflector is introduced to minimize the mechanical difficulties to scan the main beam. In addition to the reflector system design, reflector antenna performance evaluation is also important. The temperature resolution issue important for earth observation radiometer antennas is studied, and a new method to evaluate and optimize such temperature resolution is introduced.en
dc.description.degreePh. D.en
dc.format.extentix, 101 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10242005-124100en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10242005-124100/en
dc.identifier.urihttp://hdl.handle.net/10919/40108en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1993.S5445.pdfen
dc.relation.isformatofOCLC# 29687513en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1993.S5445en
dc.subject.lcshAntennas (Electronics)en
dc.titleMultiple reflector scanning antennasen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplinePhysicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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