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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: 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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