Demonstration of a dual-polarized phased-array feed

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DOIResolve DOI: http://doi.org/10.1109/TAP.2011.2122231
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TypeArticle
Journal titleIEEE Transactions on Antennas and Propagation
ISSN0018-926X
Volume59
Issue6
Pages20472057; # of pages: 11
Subjectantenna arrays; Vivaldi antennas; feeds; phased arrays; polarization; radio astronomy
AbstractWe describe the design and construction of a dual-polarized phased-array feed (PAF) with the purpose of demonstrating this technology as a means of expanding the instantaneous field-of-view of radio telescopes. The PAF beamformer is calibrated with observations of an unpolarized astronomical radio source, the covariance matrix of all receiver channels is calculated, and the two dominant eigenvectors are then used as beamformer weights. We show measurements demonstrating the capabilities of this instrument as a polarimeter, and confirm that the calibration method does produce orthogonally-polarized beams. These results are then analyzed to show the sensitivity to fluctuations in gain and phase in the multiple parallel receiver chains making up the phased-array feed. We also compare the performance of PAFs that beamform all array elements with PAFs that beamform only co-polarized elements.
Publication date
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
LanguageEnglish
AffiliationNRC Herzberg Institute of Astrophysics; National Research Council Canada
Peer reviewedYes
NPARC number19739581
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Record identifier8b979bc5-5775-427e-af0d-d5695ca44692
Record created2012-03-29
Record modified2016-05-09
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