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We have measured the aperture-array noise temperature of the first Mk. IIphased array feed that CSIRO has built for the Australian Square KilometreArray Pathfinder telescope. As an aperture array, the Mk. II phased array feedachieves a beam equivalent noise temperature less than 40 K from 0.78 GHz to1.7 GHz and less than 50 K from 0.7 GHz to 1.8 GHz for a boresight beamdirected at the zenith. We believe these are the lowest reported noisetemperatures over these frequency ranges for ambient-temperature phased arrays.The measured noise temperature includes receiver electronics noise, ohmiclosses in the array, and stray radiation from sidelobes illuminating the skyand ground away from the desired field of view. This phased array feed wasdesigned for the Australian Square Kilometre Array Pathfinder to demonstratefast astronomical surveys with a wide field of view for the Square KilometreArray.

Measured Aperture-Array Noise Temperature of the Mark II Phased Array Feed for ASKAP