Compact turnstile quad-ridge orthomode transducer with octave bandwidth for radio astronomy applications

Nasrin Tasouji; Sara Salem Hesari; Doug Henke; Lewis B. G. Knee; Thomas Sieverding; Adam Densmore; Jens Bornemann

doi:10.1117/12.3017641

16 August 2024 Compact turnstile quad-ridge orthomode transducer with octave bandwidth for radio astronomy applications

Nasrin Tasouji, Sara Salem Hesari, Doug Henke, Lewis B. G. Knee, Thomas Sieverding, Adam Densmore, Jens Bornemann

Author Affiliations +

Proceedings Volume 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII; 131021H (2024) https://doi.org/10.1117/12.3017641
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

A novel wideband orthomode transducer (OMT) featuring a folded-arm turnstile junction covering a 2:1 frequency band is employed to achieve an effective structure while meeting the strict OMT requirements for radio astronomy applications. The turnstile junction is designed with two symmetry planes to ensure separation between perpendicular polarizations and the effective management of higher order modes. Within the throat of the turnstile junction, stepped cylinders serve as scattering elements and matching stubs to ensure efficient impedance matching between the quad-ridge circular waveguide at the input and the single-ridge rectangular waveguides at the output. The folded arms play a pivotal role in achieving excellent matching while significantly reducing the overall size. Considering the significance of developing wideband radio astronomy receivers with minimal noise, this design demonstrates a precisely engineered compact OMT, with tuned bends, junctions, and delivers simulated return loss better than 20 dB while maintaining cross-polarization performance well below 65 dB within the specified 20-40 GHz frequency range.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Nasrin Tasouji, Sara Salem Hesari, Doug Henke, Lewis B. G. Knee, Thomas Sieverding, Adam Densmore, and Jens Bornemann "Compact turnstile quad-ridge orthomode transducer with octave bandwidth for radio astronomy applications", Proc. SPIE 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII, 131021H (16 August 2024); https://doi.org/10.1117/12.3017641

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