Simulated radiation features of a C-band phased array feed located at the Sardinia Radio Telescope primary focus

Paola Di Ninni; Renzo Nesti; Paolo Maxia; Alessandro Navarrini; Massimiliano Belluso; Sergio Billotta; Alessandro Cabras; Simone Chiarucci; Giovanni Comoretto; Francesco Gaudiomonte; Adelaide Ladu; Pasqualino Marongiu; Andrea Melis; Pierluigi Ortu; Silvio Pilia; Tonino Pisanu; Luca Schirru

doi:10.1117/12.3019956

16 August 2024 Simulated radiation features of a C-band phased array feed located at the Sardinia Radio Telescope primary focus

Paola Di Ninni, Renzo Nesti, Paolo Maxia, Alessandro Navarrini, Massimiliano Belluso, Sergio Billotta, Alessandro Cabras, Simone Chiarucci, Giovanni Comoretto, Francesco Gaudiomonte, Adelaide Ladu, Pasqualino Marongiu, Andrea Melis, Pierluigi Ortu, Silvio Pilia, Tonino Pisanu, Luca Schirru

Author Affiliations +

Proceedings Volume 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII; 131021E (2024) https://doi.org/10.1117/12.3019956
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

This study focuses on the radiation performance of a system composed of a room-temperature C-band Phased Array Feed (PAF) illuminating the 64-m diameter Sardinia Radio Telescope (SRT) main reflector from its primary focus (f/D=0.328). The PAF, a square array with 8x8 dual-polarized antennas, is the first version of a prototype designed for radio astronomy applications in the framework of an R&D (Research and Development) project of the Italian National Institute for Astrophysics (INAF). To guarantee high sensitivity and low noise temperature, the PAF elements have been designed for an optimum coupling with the SRT main reflector by trading off between maximizing the illumination efficiency and minimizing the spillover. In this paper, first, we present the results of the electromagnetic simulation of the PAF element radiation patterns in the Far Field (FF) region, both by assuming no interaction with the reflector and by taking into account the reflection from the SRT main reflector primary focus; second, we present the performance of the beamformed patterns obtained by applying two different beamforming methods; finally, we assess the aperture blockage effect due to the SRT sub-reflector. Results are shown at three frequencies within the operative band of the C-band PAF, i.e. at 4.5, 5.5 and 6.0 GHz.

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Paola Di Ninni, Renzo Nesti, Paolo Maxia, Alessandro Navarrini, Massimiliano Belluso, Sergio Billotta, Alessandro Cabras, Simone Chiarucci, Giovanni Comoretto, Francesco Gaudiomonte, Adelaide Ladu, Pasqualino Marongiu, Andrea Melis, Pierluigi Ortu, Silvio Pilia, Tonino Pisanu, and Luca Schirru "Simulated radiation features of a C-band phased array feed located at the Sardinia Radio Telescope primary focus", Proc. SPIE 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII, 131021E (16 August 2024); https://doi.org/10.1117/12.3019956

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