Please use this identifier to cite or link to this item: http://hdl.handle.net/11189/6448
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dc.contributor.authorDe Villiers, Dirk ILen_US
dc.contributor.authorLehmensiek, Roberten_US
dc.contributor.authorIvashina, Marianna Ven_US
dc.date.accessioned2018-07-11T11:06:19Z-
dc.date.available2018-07-11T11:06:19Z-
dc.date.issued2016-
dc.identifier.issn1947-1491-
dc.identifier.urihttp://hdl.handle.net/11189/6448-
dc.identifier.urihttp://dx.doi.org/10.1109/APS.2015.7305149-
dc.description2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meetingen_US
dc.description.abstractThe offset Gregorian reflector system of the Square Kilometer Array (SKA) radio telescope is required to operate down to very low frequencies, where reflectors become (electrically) relatively small. Shaping the reflectors to control the aperture distribution can improve the electrical performance of the system. Since the system is expected to operate over more than a decade of bandwidth, the shaping is performed using standard Geometric Optics methods. This paper systematically investigates the effects that diffraction will have at low frequencies on the performance of several performance metrics for a wide range of shaped geometries. It is shown that the peak position of the primary design objective, the receiving sensitivity, is relatively insensitive to diffraction effects, making such wide band shaped reflectors a viable option for the SKA.en_US
dc.language.isoenen_US
dc.publisherIEEEen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/za/-
dc.subjectAntenna feedsen_US
dc.subjectReflector antennasen_US
dc.subjectRadio astronomyen_US
dc.subjectDiffractionen_US
dc.subjectSensitivityen_US
dc.subjectWidebanden_US
dc.subjectBroadband antennasen_US
dc.titleLow frequency diffraction effects when shaping the offset Gregorian Reflector System of the SKAen_US
dc.typeArticleen_US
dc.relation.conferenceProceedings of ISAP2016, Okinawa, Japanen_US
Appears in Collections:Eng - Conference Proceedings
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