An Optimal Beamforming Strategy for Wide-Field Surveys With Phased-Array-Fed Reflector Antennas
Artikel i vetenskaplig tidskrift, 2011

An optimal beamforming strategy is proposed for performing large-field surveys with dual-polarized phased-array-fed reflector antennas. This strategy uses signal-processing algorithms that maximize the beam sensitivity and the continuity of a field of view (FOV) that is formed by multiple closely overlapping beams. A mathematical framework and a newly developed numerical approach are described to analyze and optimize a phased array feed (PAF) system. The modeling approach has been applied to an experimental PAF system (APERTIF prototype) that is installed on the Westerbork Synthesis Radio Telescope. The resulting beam shapes, sensitivity, and polarization diversity characteristics (such as the beam orthogonality and the intrinsic cross-polarization ratio) are examined over a large FOV and frequency bandwidth. We consider weighting schemes to achieve a conjugate-field matched situation (max. received power), maximum signal-to-noise ratio (SNR), and a reduced SNR scenario but with constraints on the beam shape. The latter improves the rotational symmetry of the beam and reduces the sensitivity ripple, at a modest maximum sensitivity penalty. The obtained numerical results demonstrate a very good agreement with the measurements performed at the telescope.


focal plane arrays

Antenna arrays


array signal processing

system modeling techniques


array feeds (PAFs)



reflector antenna

radio astronomy


Marianna Ivashina

Netherlands Institute for Radio Astronomy (ASTRON)

Chalmers University of Technology

O. Iupikov

Sevastopol National Technical University

Rob Maaskant

Chalmers, Signaler och system, Kommunikationssystem, informationsteori och antenner, Antennsystem

W. van Cappellen

Netherlands Institute for Radio Astronomy (ASTRON)

T. Oosterloo

Netherlands Institute for Radio Astronomy (ASTRON)

IEEE Transactions on Antennas and Propagation

0018-926X (ISSN)

Vol. 59 1864-1875 5725169


Informations- och kommunikationsteknik


Elektroteknik och elektronik