Technology Developmentfor
Radioastronomy
• Receivers/ Front-ends/Cryogenics
• Wide band spectrometers (Space program)
ISTITUTO DI RADIOASTRONOMIA
26-28 November 2007 Visiting Committee
Collaboration with:
• Osservatorio Astrofisico di Arcetri
• Osservatorio Astronomico di Cagliari
• Department of Electronic Engineering - University of Firenze
• IEIIT - CNR Torino
• MECSA (Microwave Engineering Center for Space Applications) - Firenze
• KOSMA - Cologne University
• ASTRON
ISTITUTO DI RADIOASTRONOMIA
26-28 November 2007 Visiting Committee
Multibeam and Front-end Development(0.3 - 90 GHz)
On going programs:
• SRT first light receivers (with tests at Medicina antenna)
- Gregorian focus 7 beams 18-26 GHz (Faraday - FP5)
- BWG 5.7 - 7.7 GHz
- prime focus dual frequency 0.3 - 0.425 / 1.3 - 1.8 GHz
• participation to PHAROS project (FP6)
• microwave passive component design optimization for cheaperand simple manufacturing units
Extensive experience in designing and building microwave passivecomponents both at room and cryogenic temperature.
18 - 26 GHz Multibeam (Faraday - FP5)
Feed hornC.W.Coupler
DPS
ISTITUTO DI RADIOASTRONOMIA
Visiting Committee26-28 November 2007
Tatm = 265 Kτ = 0.1f = 22 GHz
ISTITUTO DI RADIOASTRONOMIA
26-28 November 2007 Visiting Committee
SRT prime focus dual frequency0.3 - 0.425 / 1.3 - 1.8 GHz
SRT BWG 5.7 - 7.7 GHz • Marker injector• Polarizer• OMT• Feed horn in production
•E.M. Study
•Mechanical sketch
ISTITUTO DI RADIOASTRONOMIA
26-28 November 2007 Visiting Committee
RADIONET Collaboration(PHased Arrays for Reflector Observing Systems)
13x13 elements Vivaldi array
pitch 18.6 mm
Optimized for:
• prime focus 0.3-0.5 f/D
• 4 - 8 GHz
Antennas, LNA, beam former cryocooled
Four beamsWide frequency rangeHigh efficiencyIncreased FOV (survey speed)Correction of surface errorsRFI mitigation
26-28 November 2007 Visiting Committee
Participation to WideBand Spectrometer for HiFi/HerschelISTITUTO DI RADIOASTRONOMIA
HiFiRadio receivers for sub-mm Inst. IF BW : 4 GHz (in 2 pol.)WBS2x4x1 GHzpixel spacing 0.6 MHz1.1 MHz resolution
ISTITUTO DI RADIOASTRONOMIA
26-28 November 2007 Visiting Committee
Near Future Plans
Development of compact front-end passive components to allow theconstruction of large arrays in the frequency range 35 - 105 GHz.
Comparative study of the modified Boifot and Turnstile junction forthe manufacturing of high performance OMT taking into account:
• overall dimensions
• massive production ( several tens)
• reproducibility
• assembling
• cost
Man power : 3 persons Funds : SRT, EU (Radionet), ASI, INAF