
Proceedings Paper
L-band orthomode transducer for the Sardinia Radio TelescopeFormat | Member Price | Non-Member Price |
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Paper Abstract
We describe the design, construction, and characterization results of a compact L-band (1.3-1.8 GHz) Orthomode
Transducer (OMT) for the Sardinia Radio Telescope (SRT), a 64 m diameter telescope which is being built in the
Sardinia island, Italy. The OMT consists of three distinct mechanical parts connected through ultra low loss coaxial
cables: a turnstile junction and two identical 180° hybrid power combiners. The turnstile junction is based on a circular
waveguide input (diameter of 190 mm,) and on four WR650 rectangular waveguide cavities from which the RF signals
are extracted using coaxial probes. The OMT was optimized using a commercial 3D electromagnetic simulator. The
main mechanical part of the turnstile junction was machined out of an Aluminum block whose final external shape is a
cylinder with diameter 450 mm and height 98 mm.
From 1.3 to 1.8 GHz the measured reflection coefficient was less than -22 dB, the isolation between the outputs was less
than -45 dB, and the cross polarization was less than -50 dB for both polarization channels.
Paper Details
Date Published: 9 July 2008
PDF: 12 pages
Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70147N (9 July 2008); doi: 10.1117/12.790557
Published in SPIE Proceedings Vol. 7014:
Ground-based and Airborne Instrumentation for Astronomy II
Ian S. McLean; Mark M. Casali, Editor(s)
PDF: 12 pages
Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70147N (9 July 2008); doi: 10.1117/12.790557
Show Author Affiliations
Alessandro Navarrini, INAF - Cagliari Astronomical Observatory (Italy)
Tonino Pisanu, INAF - Cagliari Astronomical Observatory (Italy)
Published in SPIE Proceedings Vol. 7014:
Ground-based and Airborne Instrumentation for Astronomy II
Ian S. McLean; Mark M. Casali, Editor(s)
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