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Full band waveguide turnstile junction orthomode transducer with phase matched outputs

Abstract: A >40% bandwidth fully scalable turnstile-based waveguide orthomode transducer having excellent phase performance is described for the WR75 standard rectangular waveguide. Flexible bandwidth tuning is achieved through the use of an interchangeable stepped scattering element. Reduced height waveguide topology provides a simple, compact, and robust design against mechanical tolerances. The intrinsic broadband nature of half-height E-plane bends and single-step power combiners assures high order mode free increased bandwidth in balanced phase operation. The designed orthomode transducer exhibits a return loss better than 23 dB at any port, an insertion loss less than 0.06 dB, and an isolation of 50 dB over the full bandwidth. Moreover, the phase difference between orthogonal polarizations is lower than 0.7° over the band, thus enabling applications where phase-matched outputs are required. This design has been chosen for the QUIJOTE cosmic microwave background experiment due to its cost-effective, compact design, and high-quality performance as well as being readily scalable to the WR51 and WR28 waveguide bands.

 Autoría: Cano J., Tribak A., Hoyland R., Mediavilla A., Artal E.,

 Fuente: International Journal of RF and Microwave Computer-Aided Engineering, 2010, 20(3), 333-241

 Editorial: John Wiley & Sons

 Fecha de publicación: 01/05/2010

 Nº de páginas: 9

 Tipo de publicación: Artículo de Revista

 DOI: 10.1002/mmce.20437

 ISSN: 1096-4290,1099-047X

 Proyecto español: AYA2007-68058-C03-0

 Url de la publicación: https://doi.org/10.1002/mmce.20437