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

David Dousset, Stephane Claude, Ke Wu
2013 IEEE Access  
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
more » ... igh 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. INDEX TERMS Radio astronomy, orthomode transducer (OMT), turnstile junction, polarization diplexer.
doi:10.1109/access.2013.2273971 fatcat:ty7vy2ff3jgvnf2axpe4cj3yrq