Gonzalez, A.A.GonzalezTapia, V.V.TapiaReyes, N.N.ReyesMena, F. P.F. P.MenaNESTI, RenzoRenzoNESTIVILLA, FABRIZIOFABRIZIOVILLACUTTAIA, FRANCESCOFRANCESCOCUTTAIADE ROSA, ADRIANO GIUSEPPEADRIANO GIUSEPPEDE ROSADI GIORGIO, Anna MariaAnna MariaDI GIORGIOMORBIDINI, AlfredoAlfredoMORBIDINIYagoubov, PavelPavelYagoubov2020-04-302020-04-302016978-1-5090-2886-3http://hdl.handle.net/20.500.12386/24403The ALMA telescope is one of the largest on-ground astronomical projects in the world. It has been producing great scientific results since the beginning of operations in 2011. Of all the originally planned bands, band 2 (67-90 GHz) is the last band to be implemented into the array. Recent technological progress has open the possibility to combine bands 2 and 3 (84-116 GHz) into a single wideband receiver. This paper describes the first efforts to design wideband optics which cover both bands, from 67 to 116 GHz, using a profiled corrugated horn and a modified Fresnel lens. First measurements were performed at ESO in Dec15-Jan16 and showed good agreement with simulations.ELETTRONICOenConference paper10.1109/APS.2016.76963052-s2.0-84997471545https://doi.org/10.1109/APS.2016.76963052016isap.conf.1195GFIS/05 - ASTRONOMIA E ASTROFISICAScienze Fisiche Settori ERC (ERC) di riferimento::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_17 Instrumentation – telescopes, detectors and techniques