Analysis of three-dimensional field distributions for focussed unapodized/apodized annular beams

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dc.contributor.authorBhabu, Shaleen J.en
dc.contributor.committeechairPoon, Ting-Chungen
dc.contributor.committeememberBesieris, Ioannis M.en
dc.contributor.committeememberClaus, Richard O.en
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2014-03-14T21:29:02Zen
dc.date.adate2009-02-13en
dc.date.available2014-03-14T21:29:02Zen
dc.date.issued1990-08-14en
dc.date.rdate2009-02-13en
dc.date.sdate2009-02-13en
dc.description.abstractThe study of focal shift in focused beams using unapodized apertures has been well documented. However, not much work has been done on apodized apertures. In this thesis we use a Fourier-Optic approach to analyze the field distribution of a focused beam around the region of geometrical focus. The analytical formulation developed is general in nature as it is valid for any arbitrary aperture functions. This is then applied to some specific cases. Two cases of interest that are considered are the unapodized and the Gaussian apodized annular apertures. In order to study the intensity distributions around the geometrical focus, simulation results are presented using closed form analytical expressions and approximate integral forms. Specific emphasis is placed on the focal shift in the two apertures and on the effect of changing various parameters. A prognosis for future work using a-Modulation on Gaussian apodized annular apertures is also presented.en
dc.description.degreeMaster of Scienceen
dc.format.extentviii, 108 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-02132009-171334en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02132009-171334/en
dc.identifier.urihttp://hdl.handle.net/10919/41042en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1990.B533.pdfen
dc.relation.isformatofOCLC# 23590931en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1990.B533en
dc.subject.lcshApodizationen
dc.subject.lcshHolesen
dc.titleAnalysis of three-dimensional field distributions for focussed unapodized/apodized annular beamsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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