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Proceedings Paper

KPAF (K-band phased array feed) instrument concept
Author(s): Lisa Locke; Stéphane Claude; Jens Bornemann; Doug Henke; James Di Francesco; Frank Jiang; Dominic Garcia; Ivan Wevers; Pat Niranjanan
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Paper 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.

Paper Details

Date Published: 23 July 2014
PDF: 11 pages
Proc. SPIE 9153, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII, 91531Z (23 July 2014); doi: 10.1117/12.2057146
Show Author Affiliations
Lisa Locke, NRC - Herzburg Institute of Astrophysics (Canada)
Univ. of Victoria (Canada)
Stéphane Claude, NRC - Herzburg Institute of Astrophysics (Canada)
Jens Bornemann, Univ. of Victoria (Canada)
Doug Henke, NRC - Herzburg Institute of Astrophysics (Canada)
James Di Francesco, NRC - Herzburg Institute of Astrophysics (Canada)
Frank Jiang, NRC - Herzburg Institute of Astrophysics (Canada)
Dominic Garcia, NRC - Herzburg Institute of Astrophysics (Canada)
Ivan Wevers, NRC - Herzburg Institute of Astrophysics (Canada)
Pat Niranjanan, NRC - Herzburg Institute of Astrophysics (Canada)


Published in SPIE Proceedings Vol. 9153:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII
Wayne S. Holland; Jonas Zmuidzinas, Editor(s)

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