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Waveguide antenna feed for the Square Kilometre Array

dc.contributor.advisorDe Villiers, D. I. L.en_ZA
dc.contributor.advisorMeyer, P.en_ZA
dc.contributor.authorSchoeman, Karlaen_ZA
dc.contributor.otherUniversity of Stellenbosch. Faculty of Engineering. Dept. of Electrical and Electronic Engineering.en_ZA
dc.date.accessioned2011-02-18T13:03:33Zen_ZA
dc.date.accessioned2011-03-14T08:45:47Z
dc.date.available2011-02-18T13:03:33Zen_ZA
dc.date.available2011-03-14T08:45:47Z
dc.date.issued2011-03en_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/6833
dc.descriptionThesis (MscEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2011.en_ZA
dc.description.abstractENGLISH ABSTRACT: The aim of this thesis is to investigate the suitability of TEM (Transverse Electromagnetic) horn antennas for use as feed structures for the Square Kilometre Array (SKA) radio telescope, in particular with regard to the roundness of the radiation pattern. A literature study shows that existing TEM horn designs do not yield a round radiation pattern over a wide bandwidth and that an alternative is required. The Method of Moments (MoM) is a computational electromagnetic (CEM) technique typically used in the analysis of TEM horn antennas. An in-house MoM solver is successfully developed to analyse such antennas and is able to calculate the current density on the surface of a conductor, as well as the farfield patterns of an antenna. A modification to an exponential TEM horn antenna is proposed and simulations show the modification is successful in yielding a round radiation pattern over a wide bandwidth. The modified exponential TEM horn has a convex triangular arc at the end of each antenna plate and is constructed for measurement. Due to limited construction capabilities, the measurements deviate slightly from the simulated results but still indicate the potential of the structure to yield a round radiation pattern over a wide bandwidth.en_ZA
dc.description.abstractAFRIKAANSE OPSOMMING: Die doel van hierdie tesis is om die geskiktheid van transverse elektromagnetiese (TEM) horing antennas te ondersoek vir die gebruik as voerstrukture vir die Square Kilometre Array (SKA)- radioteleskoop, veral met betrekking tot die rondheid van die stralingspatroon. ’n Literatuurstudie toon dat bestaande TEM horing ontwerpe nie ’n ronde stralingspatroon oor ’n wye bandwydte lewer nie, en dat ’n alternatief nodig is. Die metode van momente is ’n rekenbare elektromagnetiese tegniek wat tipies gebruik word in die ontleding van TEM horing antennas. ’n In-huis metode van momente ontleder is suksesvol ontwikkel om sulke antennas te analiseer en is in staat om die stroomdigtheid op die oppervlak van ’n geleier, sowel as die vêrveld patrone van die antenna te bereken. ’n Wysiging van ’n eksponensiële TEM horing antenna word voorgestel en simulasies toon dat die veranderings suksesvol is om ’n ronde stralingspatroon oor ’n wye bandwydte te skep. Die verander eksponensiële TEM horing het ’n konvekse driehoekige boog aan die einde van elke antenna plaat en is gebou vir meting. Weens beperkte konstruksie vermoëns, toon die metings ’n afwyking van die gesimuleerde resultate, maar dui nogsteeds die potensiaal aan van die struktuur om ’n ronde stralingspatroon te lewer oor ’n wye bandwydte.af_ZA
dc.format.extent103 p. : ill.
dc.language.isoen_ZAen_ZA
dc.publisherStellenbosch : University of Stellenboschen_ZA
dc.subjectTEM antennasen_ZA
dc.subjectHorn feedsen_ZA
dc.subjectMethod of momentsen_ZA
dc.subjectReflecter antennasen_ZA
dc.subjectDissertations -- Electronic engineeringen_ZA
dc.subjectTheses -- Electronic engineeringen_ZA
dc.subjectTEM (Transverse Electromagnetic) horn antennasen_ZA
dc.subjectSquare Kilometre Array (SKA) radio telescopeen_ZA
dc.titleWaveguide antenna feed for the Square Kilometre Arrayen_ZA
dc.typeThesisen_ZA
dc.rights.holderUniversity of Stellenbosch


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