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http://hdl.handle.net/20.500.12386/34174
Title: | Feasibility Study of a W-Band Multibeam Heterodyne Receiver for the Gregorian Focus of the Sardinia Radio Telescope | Authors: | NAVARRINI, Alessandro OLMI, Luca NESTI, Renzo ORTU, Pierluigi MARONGIU, Pasqualino ORLATI, ANDREA SCALAMBRA, ALESSANDRO ORFEI, ALESSANDRO RODA, JURI CATTANI, ALESSANDRO Leurini, Silvia GOVONI, FEDERICA MURGIA, MATTEO CARRETTI, ETTORE FIERRO, Davide PELLIZZONI, ALBERTO PAOLO |
Issue Date: | 2022 | Journal: | IEEE ACCESS | Number: | 10 | First Page: | 26369 | Abstract: | We report on the feasibility study of a W-band multibeam heterodyne receiver for the Sardinia Radio Telescope (SRT), a general purpose fully steerable 64-m diameter antenna located on the Sardinia island, Italy, managed by INAF ('Istituto Nazionale di Astrofisica,' Italy). The W-band front-end is designed for the telescope Gregorian focal plane and will detect both continuum and molecular spectral lines from astronomical sources and radio emission from the Sun in the 3 mm atmospheric window. The goal specification of the receiver is a $4\times 4$ focal plane array operating in dual-linear polarization with a front-end consisting of feed-horns placed in cascade with waveguide Orthomode Transducers (OMTs) and LNAs (Low Noise Amplifiers) cryogenically cooled at $\approx $ 20 K. The instantaneous FoV (Field of View) of the telescope is limited by the shaping of the 64-m primary and 7.9-m secondary mirrors. The cryogenic modules are designed to fit in the usable area of the focal plane and provide high-quality beam patterns with high antenna efficiency across the 70 - 116 GHz Radio Frequency (RF) band. The FoV covered by the $4\times 4$ array is $2.15\times 2.15$ arcmin2, unfilled, with separation between contiguous elements of 43 arcsec. Dual-sideband separation (2SB) down-conversion mixers are designed to be placed at the cryostat output and arranged in four four-pixel down-conversion modules with 4 - 12 GHz Intermediate Frequency (IF) bands (both Upper Side Band and Lower Side Band selectable for any pixel and polarization). The receiver utilizes a mechanical derotator to track the parallactic angle. | URI: | http://hdl.handle.net/20.500.12386/34174 | URL: | https://api.elsevier.com/content/abstract/scopus_id/85125291709 https://ieeexplore.ieee.org/document/9718287 |
ISSN: | 2169-3536 | DOI: | 10.1109/ACCESS.2022.3153492 | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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Feasibility_Study_of_a_W-Band_Receiver_for_SRT.pdf | Pdf editoriale | 6.47 MB | Adobe PDF | View/Open |
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