23 July 2014 KPAF (K-band phased array feed) instrument concept
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Abstract
Astronomical surveys are demanding more throughput from telescope receivers. Currently, microwave/millimeter telescopes with mature cryogenic single pixel receivers are upgrading to multi-pixel receivers by replacing the conventional feed horns with phased array feeds (PAFs) to increase the field of view and, thus, imaging speeds. This step in astronomy instrumentation has been taken by only a few research laboratories world-wide and primarily in Lband (0.7-1.5 GHz). We present a K-band (18-26 GHz) 5x5 modular PAF to demonstrate the feasibility of higher frequency receiving arrays. The KPAF system includes a tapered slot antenna array, a cryogenic commercial GaAs MMIC amplifier block, and a mixing stage to down-convert to L band for an existing beamformer. The noise temperature and power budget are outlined. Full antenna S-parameters and far-field beam patterns are simulated and measured using both planar near-field and far-field techniques. Cryogenic and room temperature amplifier noise measurements with varying bias levels are presented.
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Lisa Locke, Lisa Locke, Stéphane Claude, Stéphane Claude, Jens Bornemann, Jens Bornemann, Doug Henke, Doug Henke, James Di Francesco, James Di Francesco, Frank Jiang, Frank Jiang, Dominic Garcia, Dominic Garcia, Ivan Wevers, Ivan Wevers, Pat Niranjanan, Pat Niranjanan, } "KPAF (K-band phased array feed) instrument concept", Proc. SPIE 9153, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII, 91531Z (23 July 2014); doi: 10.1117/12.2057146; https://doi.org/10.1117/12.2057146
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