Browsing by Author "Steenkamp, Nicol"
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- ItemDesign of a wideband sinuous antenna for radio telescope applications(Stellenbosch : Stellenbosch University, 2018-03) Steenkamp, Nicol; De Villiers, Dirk I. L.; Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering.ENGLISH ABSTRACT: This thesis investigates a pyramidal sinuous antenna. It was suggested in a previous study that the pyramidal shape would be easier to manufacture than a conical shape. To test this, a model was simulated and manufactured to operate over 2 - 6 GHz. It proved to be more robust with a differential reflection coefficient around -10 dB compared to its conical counterpart which is around -5 dB. The wideband capabilities were also investigated. A new modelling approach was required for the wide bandwidth. Though a 10:1 version was simulated, the manufactured model only performed decently over a 5:1 bandwidth. A parameter study was also conducted on the antenna to estimate its performance in Band 1 of the Square Kilometre Array. The best performance results were determined with the best mean sensitivity possible, while maintaining a differential reflection coefficient less than -10 dB, being 4.6 m2/K.