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