SKALA, a log-periodic array antenna for the SKA-low instrument: design, simulations, tests and system considerations
2015
The very demanding requirements of the SKA-
lowinstrument call for a challenging antenna design capable of delivering excellent performance in radiation patterns, impedance matching, polarization purity, cost, longevity, etc. This paper is devoted to the development (design and test of the first prototypes) of an active ultra-wideband antenna element for the
low-frequency instrument of the SKA
radio telescope. The antenna element and differential
low noise amplifierdescribed here were originally designed to cover the former SKA-
lowband (70–450 MHz) but it is now aimed to cover the re-defined SKA-
lowband (50–350 MHz) and furthermore the antenna is capable of performing up to 650 MHz with the current design. The design is focused on maximum sensitivity in a wide field of view (+/− 45° from
zenith) and
lowcross-polarization ratios. Furthermore, the size and cost of the element has to be kept to a minimum as millions of these antennas will need to be deployed for the full SKA in very compact configurations. The primary focus of this paper is therefore to discuss various design implications for the SKA-
lowtelescope.
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