Electromagnetic Gap Leakage Analysis for the SKA Mid-Frequency Dish

Date Issued
2019
Author(s)
Venter, Mariet
•
DOI
Abstract
This paper presents electromagnetic analysis as performed on the Square Kilometre Array (SKA) mid-frequency dish in order to estimate the ground leakage caused by gaps in the main reflector. The effects of the ground leakage are shown in terms of conventional performance parameters such as gain and aperture efficiency, as well as the percentage of feed power hitting the ground behind the main reflector. Analysis were performed for SKA Band 1 and 2 with a combined frequency range of 0.4 - 1.8 GHz. It is shown that the gaps in the main reflector reduce the gain between 0.23 and 0.05 dB and could increase the noise temperature by approximately 14 K when pointed at zenith. The transmission percentage of the incident power hitting the ground is below 0.2% across the combined bands.
Coverage
2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting
Series
Start page
473
Conferenece
2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting
Conferenece place
Atlanta, GA, USA
Conferenece date
7-12 July, 2019
Uri
Url
Issn Identifier
1522-3965
Rights
open.access
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