Title :
A Compact High-Performance Orthomode Transducer for the Atacama Large Millimeter Array (ALMA) Band 1 (31–45 GHz)
Author :
Dousset, David ; Claude, Stephane ; Ke Wu
Author_Institution :
Dept. de Genie Electr., Ecole Polytech. de Montreal, Montréal, QC, Canada
Abstract :
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.
Keywords :
aluminium; circular waveguides; millimetre wave antenna arrays; rectangular waveguides; Al; aluminum blocks; atacama large millimeter array; circular waveguide; compact high-performance orthomode transducer; frequency 31 GHz to 45 GHz; high repeatability; mechanical tolerances; rectangular waveguide; Aluminum; Milling; Ports (Computers); Rectangular waveguides; Transducers; Waveguide junctions; Radio astronomy; orthomode transducer (OMT); polarization diplexer; turnstile junction;
Journal_Title :
Access, IEEE
DOI :
10.1109/ACCESS.2013.2273971