Minimizing RF Performance Spikes in a Cryogenic Orthomode Transducer (OMT) | IEEE Journals & Magazine | IEEE Xplore

Minimizing RF Performance Spikes in a Cryogenic Orthomode Transducer (OMT)


Abstract:

The 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 i...Show More

Abstract:

The 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.
Published in: IEEE Transactions on Microwave Theory and Techniques ( Volume: 62, Issue: 4, April 2014)
Page(s): 840 - 850
Date of Publication: 10 March 2014

ISSN Information:


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