Minimizing RF performance spikes in a cryogenic orthomode transducer (OMT)

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DOIResolve DOI: http://doi.org/10.1109/TMTT.2014.2309551
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TypeArticle
Journal titleIEEE Transactions on Microwave Theory and Techniques
ISSN0018-9480
Volume62
Issue4
Article number6762816
Pages840850; # of pages: 11
SubjectCryogenics; Millimeter waves; Polarization; Radio astronomy; Signal receivers; Assembly features; Cryogenic temperatures; Low cross polarization; Millimeter-wave receivers; Ortho-mode transducers; Polarization splitters; Receiver noise; Turnstile junctions; Transducers
AbstractThe turnstile junction exhibits very low cross-polarization leakage and is suitable for low-noise millimeter-wave receivers. For use in a cryogenic receiver, it is best if the orthomode transducer (OMT) is implemented in waveguide, contains no additional assembly features, and may be directly machined. However, machined OMTs are prone to sharp signal drop-outs that are costly to overall performance since they show up directly as spikes in receiver noise. We explore the various factors contributing to this degradation and discuss how the current design mitigates each cause. Final performance is demonstrated at cryogenic temperatures.
Publication date
PublisherIEEE
LanguageEnglish
AffiliationNational Research Council Canada; National Science Infrastructure
Peer reviewedYes
NPARC number21272674
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Record identifier022d15ae-5ffe-4cc2-9b45-ee761918a48b
Record created2014-12-03
Record modified2016-05-09
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