Translator Disclaimer
Paper
9 July 2008 L-band orthomode transducer for the Sardinia Radio Telescope
Author Affiliations +
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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alessandro Navarrini and Tonino Pisanu "L-band orthomode transducer for the Sardinia Radio Telescope", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70147N (9 July 2008); https://doi.org/10.1117/12.790557
PROCEEDINGS
12 PAGES


SHARE
Advertisement
Advertisement
RELATED CONTENT

Q band receiver system design for the Canadian DVA 2...
Proceedings of SPIE (December 13 2020)
Non-inertial ultra-wideband acoustic transducers
Proceedings of SPIE (April 09 2009)
The dual band LP feed system for the Sardinia Radio...
Proceedings of SPIE (July 15 2010)
A compact L-band Ortho Mode Junction
Proceedings of SPIE (July 15 2010)
Results from the Maine 1992 foliage penetration experiment
Proceedings of SPIE (November 15 1993)
A waveguide orthomode transducer for 385-500 GHz
Proceedings of SPIE (July 15 2010)

Back to Top