PUPILLO, GiuseppeGiuseppePUPILLONAVARRINI, AlessandroAlessandroNAVARRINIMELIS, AndreaAndreaMELISCONCU, RaimondoRaimondoCONCUORTU, PierluigiPierluigiORTUMARONGIU, PasqualinoPasqualinoMARONGIUNALDI, GiovanniGiovanniNALDIRUSTICELLI, SIMONESIMONERUSTICELLISABA, AndreaAndreaSABASCALAMBRA, ALESSANDROALESSANDROSCALAMBRASCHIRRU, LucaLucaSCHIRRULADU, AdelaideAdelaideLADUPISANU, ToninoToninoPISANUURRU, EnricoEnricoURRU2023-11-132023-11-132021978-2-87487-059-0http://hdl.handle.net/20.500.12386/34472We describe the beamforming strategy and the preliminary laboratory characterization results of the beam pattern synthesized by the PHAROS2 Phased Array Feed (PAF), a 4-8 GHz PAF with digital beamformer for radio astronomy application. The PAF is based on an array of 10×11 dual-polarization Vivaldi antennas cryogenically cooled at 20 K along with low noise amplification modules (LNAs) cascaded with a multi-channel Warm Section (WS) receiver. We present the beamforming and test procedures used to, respectively digitally synthesize and characterize the PHAROS2 antenna array beam pattern at 6 GHz. The tests of the array were carried out at room temperature by directly connecting 24 antenna elements to the WS and iTPM digital beamformer in a laboratory measurement setup.ELETTRONICOenConference paper10.23919/EuMC48046.2021.93379382-s2.0-85100951084http://www.scopus.com/inward/record.url?eid=2-s2.0-85100951084&partnerID=MN8TOARSFIS/05 - ASTRONOMIA E ASTROFISICA