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Full band waveguide turnstile junction orthomode transducer with phase matched outputs
Author(s) -
Cano Juan L.,
Tribak Abdelwahed,
Hoyland Roger,
Mediavilla Angel,
Artal Eduardo
Publication year - 2010
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20437
Subject(s) - turnstile , bandwidth (computing) , broadband , insertion loss , return loss , microwave , transducer , ku band , waveguide , optics , phase shift module , electronic engineering , optoelectronics , engineering , electrical engineering , physics , computer science , telecommunications , antenna (radio) , programming language
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. © 2010 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2010.