APERTIF: Phased array feeds for the westerbork synthesis radio telescope

Cappellen, W. A. van; Bakker, L.

doi:10.1109/array.2010.5613297

Cited by 55 publications

(37 citation statements)

References 9 publications

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“…The latter two findings have also been observed in measurements [4] for a horn feed and a 121-element Vivaldi PAF system installed at the Westerbork Synthesis Radio Telescope (118λ-diameter), where we have shown that the relative difference between the simulated and measured antenna efficiencies is only in the order of a few percent.…”

Section: Feed-reflector Antenna System Performance Studysupporting

confidence: 58%

“…12 shows the illumination efficiencies η ill of a 118λ reflector antenna (D = 25 m, F/D = 0.35), either fed by the Vivaldi array feed, or a single horn antenna. The numerically computed results are compared to measurements at the Westerbork Synthesis Radio Telescope (WSRT) [4]. As one can see, the agreement is very good.…”

Section: Feed-reflector Antenna System Performance Studymentioning

confidence: 82%

“…In practice, however, when the amplifier/LNA impedance changes up to 10-20%, this only weakly affect η ap and η mis and their ripple. [4]. Bottom of the figure: a photo of the experimental PAF system placed at the focal region of the reflector, and an image of a smaller-scale PAF-reflector model.…”

Section: Feed-reflector Antenna System Performance Studymentioning

confidence: 99%

See 2 more Smart Citations

Fast and Accurate Analysis of Reflector Antennas With Phased Array Feeds Including Multiple Reflections Between Feed and Reflector

Iupikov

Maaskant

Ivashina

et al. 2014

IEEE Trans. Antennas Propagat.

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Abstract-Several electrically large Phased Array Feed (PAF) reflector systems are modeled to examine the mechanism of multiple reflections between parabolic reflectors and low-and highscattering feeds giving rise to frequency-dependent patterns and impedance ripples. The PAF current is expanded in physics-based macro domain basis functions (CBFs), while the reflector employs the Physical Optics (PO) equivalent current. The reflector-feed coupling is systematically accounted for through a multiscattering Jacobi approach. An FFT expands the reflector radiated field in only a few plane waves, and the reflector PO current is computed rapidly through a near-field interpolation technique. The FEKO software is used for several cross validations, and the convergence properties of the hybrid method are studied for several representative examples showing excellent numerical performance. The measured and simulated results for a 121-element Vivaldi PAF, which is installed on the Westerbork Synthesis Radio Telescope, are in very good agreement.Index Terms-phased array feeds, radio astronomy, method of moments, characteristic basis function method, physical optics.

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Section: Feed-reflector Antenna System Performance Studysupporting

confidence: 58%

Section: Feed-reflector Antenna System Performance Studymentioning

confidence: 82%

See 1 more Smart Citation

Fast and Accurate Analysis of Reflector Antennas With Phased Array Feeds Including Multiple Reflections Between Feed and Reflector

Iupikov

Maaskant

Ivashina

et al. 2014

IEEE Trans. Antennas Propagat.

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“…PAFs are currently being developed for the Westerbork Synthesis Radio Telescope (WSRT) in the Netherlands (the Aperture Tile-in-Focus (APERTIF) project) [2] and the Australian SKA Pathfinder (ASKAP) [3]. This multi-beaming capability can also be used in an aperture array (or directly radiating phased array) to enlarge their instantaneous fieldof-view or track multiple sources simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Advances in phased array systems for radio astronomy

Wijnholds

Cappellen

Vaate

2013

2013 IEEE Antennas and Propagation Society International Symposium (APSURSI)

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Phased array antenna systems are a defining technology in many current and planned radio astronomical instruments. Phased array technology enables new observing modes due to their large field-of-view, multi-beaming capability and rapid response. The radio astronomical application provides interesting challenges such as stringent requirements on system temperature and system calibration. In this paper, we discuss the motivation for using phased array systems in radio astronomy and provide an overview of recent advances and results in this area.

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“…The system has 36 dual-polarized beams operating in the 0.7-1.8 GHz band (Hay et al 2007;Hotan et al 2014). A 52-element phased array called APERTIF at 21-cm wavelength has been implemented on the Westerbork telescope (van Cappellen and Bakker 2010;van Cappellen et al 2011;and Ivashina et al 2011). …”

Section: Phased-array Feedsmentioning

confidence: 99%