CryoPAF4: a cryogenic phased array feed design

Download
  1. (PDF, 2 MB)
DOIResolve DOI: http://doi.org/10.1117/12.2232190
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Proceedings titleMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII
Series titleSPIE Proceedings; no. 9914
ConferenceMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 28 June - 1 July 2016, Edinburgh, United Kingdom
Article number99141P-1
AbstractPhased array feed (PAF) receivers used on radio astronomy telescopes offer the promise of increased fields of view while maintaining the superlative performance attained with traditional single pixel feeds (SPFs). However, the much higher noise temperatures of room temperature PAFs compared to cryogenically-cooled SPFs have prevented their general adoption. Here we describe a conceptual design for a cryogenically cooled 2.8 – 5.18 GHz dual linear polarization PAF with estimated receiver temperature of 11 K. The cryogenic PAF receiver will comprise a 140 element Vivaldi antenna array and low-noise amplifiers housed in a 480 mm diameter cylindrical dewar covered with a RF transparent radome. A broadband two-section coaxial feed is integrated within each metal antenna element to withstand the cryogenic environment and to provide a 50 ohm impedance for connection to the rest of the receiver. The planned digital beamformer performs digitization, frequency band selection, beam forming and array covariance matrix calibration. Coupling to a 15 m offset Gregorian dual-reflector telescope, cryoPAF4 can expect to form 18 overlapping beams increasing the field of view by a factor of ~8x compared to a single pixel receiver of equal system temperature.
Publication date
PublisherSPIE
LanguageEnglish
AffiliationNational Research Council Canada; National Science Infrastructure
Peer reviewedYes
NPARC number23000648
Export citationExport as RIS
Report a correctionReport a correction
Record identifiera6f40199-4dc4-4ea8-99d9-597747de301e
Record created2016-08-17
Record modified2016-08-17
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)