Analysis of the Radiation Mechanisms in and Design of Tightly-Coupled Antenna Arrays

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dc.contributor.authorVogler, Terry Richarden
dc.contributor.committeechairDavis, William A.en
dc.contributor.committeememberDaSilva, Luiz A.en
dc.contributor.committeememberRenardy, Yuriko Y.en
dc.contributor.committeememberBrown, Gary S.en
dc.contributor.committeememberStutzman, Warren L.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:17:23Zen
dc.date.adate2010-11-16en
dc.date.available2014-03-14T20:17:23Zen
dc.date.issued2010-09-10en
dc.date.rdate2010-11-16en
dc.date.sdate2010-10-15en
dc.description.abstractThe objective of this research is to design well-tuned, wideband elements for thin planar or cylindrically conformal arrays of balanced elements fed over ground. These arrays have closely spaced elements to achieve wide bandwidths through mutual coupling. This dissertation develops two wideband designs in infinite, semi-infinite, and finite array configurations. The infinite array is best for element tuning. This research advances a concept of a distributed, parallel capacitance between elements and across feeds that must be mutually altered for tuning. Semi-infinite techniques limit the problem space and determine the proper resistive loads to control the low-frequency array-guided surface wave (AGSW). The tight physical placement also forms a periodic structure that, along with the array boundary, launches a wave across the array surface. Options to suppress this surface wave are resistive loading and cylindrical conformations. AGSW control is necessary to achieve a maximum bandwidth, but lower radiation or aperture efficiency results. Conformation is shown to be an ineffective method for AGSW control alone. The Wrapped Bowtie design emerges as a novel design offering nearly a 10:1 bandwidth as a finite array over ground. Some bandwidth comes from the losses in radiation efficiency, which is necessary to control the AGSW; however, its simulated VSWR < 3 bandwidth in an infinite array is 7.24:1 with full efficiency. Less than perfect efficiency is required to mitigate surface wave effects, unless bandwidth is to be compromised. That loss may be as radiation or aperture efficiency, but it is unavoidable if the infinite array bandwidth is to be maintained in finite array designs. Lastly, this research articulates a development path for tightly-coupled arrays that extends in stages from infinite to semi-infinite, and thence finite layouts. Distinctions are explained and defended for the design focus at each stage. Element design, tuning, and initial feed design occur at the infinite array stage; AGSW suppression occurs at the semi-infinite stage; and design confirmation occurs only with the finite array.en
dc.description.degreePh. D.en
dc.identifier.otheretd-10152010-173302en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10152010-173302/en
dc.identifier.urihttp://hdl.handle.net/10919/29282en
dc.publisherVirginia Techen
dc.relation.haspartVogler_TR_D_2010_Copyright.pdfen
dc.relation.haspartVogler_TR_D_2010.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjecttuningen
dc.subjectarrayen
dc.subjectwidebanden
dc.subjectcouplingen
dc.titleAnalysis of the Radiation Mechanisms in and Design of Tightly-Coupled Antenna Arraysen
dc.typeDissertationen
thesis.degree.disciplineElectrical and Computer Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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