Design of electrically small antennas and electrically small ground planes for maximizing ground wave transmission

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dc.contributor.advisorLing, Hao
dc.creatorLim, Sungkyun
dc.date.accessioned2021-04-14T22:34:23Z
dc.date.available2021-04-14T22:34:23Z
dc.date.issued2004-08-16
dc.description.abstractIn this thesis, a top-loaded, inductively-coupled, electrically small antenna is designed for high-frequency (HF) ground-wave transmission. The parameters of the antenna are optimized using a genetic algorithm together with the Numerical Electromagnetics Code. Prototypes for two top-loaded antenna designs are tested, and the measured results match well with simulations. Both antenna designs have an electrical size kr of 0.2, an efficiency greater than 65%, and a transmission performance within 1 dB of that of a commercial whip. In the second part of this thesis, the design of a miniaturized ground plane is investigated. It is first shown that when the size of the ground plane is reduced to less than one tenth of a wavelength, the transmission loss increases rapidly due to impedance mismatch. A spiral ground-plane design is then proposed that reduces the ground-plane size without a rapid increase in transmission loss. The spiral ground plane is tested under a quarter-wave monopole, and the measured results match well with simulation. Outdoor transmission test demonstrates that the transmission loss of a 0.43m-diameter spiral ground plane can achieve nearly the same transmission performance as that of a 1.2m-diameter eight-arm radial ground planeen_US
dc.description.departmentElectrical and Computer Engineeringen_US
dc.format.mediumelectronicen_US
dc.identifier.urihttps://hdl.handle.net/2152/85340
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/12304
dc.language.isoengen_US
dc.relation.ispartofUT Electronic Theses and Dissertationsen_US
dc.rightsCopyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en_US
dc.rights.restrictionRestricteden_US
dc.subjectHigh frequency ground-waveen_US
dc.subjectElectrically small antennasen_US
dc.subjectSpiral ground planeen_US
dc.titleDesign of electrically small antennas and electrically small ground planes for maximizing ground wave transmissionen_US
dc.typeThesisen_US
dc.type.genreThesisen_US
thesis.degree.departmentElectrical and Computer Engineeringen_US
thesis.degree.disciplineElectrical and Computer Engineeringen_US
thesis.degree.grantorUniversity of Texas at Austinen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science in Engineeringen_US

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