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A Compact High-Performance Orthomode Transducer for the Atacama Large Millimeter Array (ALMA) Band 1 (31–45 GHz)

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3 Author(s)
Dousset, D. ; Dept. de Genie Electr., Ecole Polytech. de Montreal, Montréal, QC, Canada ; Claude, S. ; Ke Wu

This paper describes a compact high-performance orthomode transducer (OMT) with a circular waveguide input and two rectangular waveguide outputs based on the superimposition of three aluminum blocks. Several prototypes operating in the band 1 (31-45 GHz) of the atacama large millimeter array have been fabricated and measured. The design is based on the use of a turnstile junction that is machined in a single block, requiring neither alignment nor a high degree of mechanical tolerances. Thus, a high repeatability of the design is possible for mass production. Across the 31-45 GHz band, the isolation is better than 50 dB and the return losses at the input and outputs of the OMT are better than -25 dB.

Orthomode transducer for ALMA Band 1. Orthomode transducer for ALMA Band 1.

Published in:

Access, IEEE  (Volume:1 )
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