KPAF (K-band phased array feed) instrument concept

Lisa Locke; Stéphane Claude; Jens Bornemann; Doug Henke; James Di Francesco; Frank Jiang; Dominic Garcia; Ivan Wevers; Pat Niranjanan

doi:10.1117/12.2057146

23 July 2014 KPAF (K-band phased array feed) instrument concept

Lisa Locke, Stéphane Claude, Jens Bornemann, Doug Henke, James Di Francesco, Frank Jiang, Dominic Garcia, Ivan Wevers, Pat Niranjanan

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Proceedings Volume 9153, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII; 91531Z (2014) https://doi.org/10.1117/12.2057146
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

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.

Citation Download Citation

Lisa Locke, Stéphane Claude, Jens Bornemann, Doug Henke, James Di Francesco, Frank Jiang, Dominic Garcia, Ivan Wevers, and 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); https://doi.org/10.1117/12.2057146

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KEYWORDS

Antennas

Cryogenics

Receivers

Connectors

K band

Phased arrays

Amplifiers

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