18-45-GHz sideband-separating downconverter with RF image rejection calibration

dc.contributor.authorMundia, Sitwala
dc.contributor.authorStander, Tinus
dc.date.accessioned2025-05-22T06:22:09Z
dc.date.available2025-05-22T06:22:09Z
dc.date.issued2025-02
dc.description.abstractWe present a sideband separating downconverter for radio astronomy applications, featuring radio frequency image rejection calibration for frequencies between 18 and 45 GHz. The multichip module optimizes image rejection for specific target observation frequencies by injecting a modulated portion of the Q-branch signal into the I-branch with independent upper and lower sideband injection control. Measurements demonstrate an average image rejection ratio improvement of 9 dB over a 7-GHz band of interest compared with a baseline uncalibrated operation, with improvement of over 40 dB in targeted subbands.
dc.description.departmentElectrical, Electronic and Computer Engineering
dc.description.librarianhj2025
dc.description.sdgSDG-09: Industry, innovation and infrastructure
dc.description.sponsorshipThe South African Radio Astronomy Observatory (SARAO).
dc.description.urihttps://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=9944983
dc.identifier.citationS. Mundia and T. Stander, "18–45-GHz Sideband-Separating Downconverter With RF Image Rejection Calibration," in IEEE Microwave and Wireless Technology Letters, vol. 35, no. 2, pp. 237-240, Feb. 2025, doi: 10.1109/LMWT.2024.3514321.
dc.identifier.issn2771-9588 (online)
dc.identifier.issn2771-957X (print)
dc.identifier.other10.1109/LMWT.2024.3514321
dc.identifier.urihttp://hdl.handle.net/2263/102463
dc.language.isoen
dc.publisherInstitute of Electrical and Electronics Engineers
dc.rights© Copyright 2025 IEEE - All rights reserved, including rights for text and data mining and training of artificial intelligence and similar technologies.
dc.subjectCalibration
dc.subjectAmplitude modulation
dc.subjectUniversal serial bus
dc.subjectReceivers
dc.subjectRadio frequency
dc.subjectAttenuators
dc.subjectVectors
dc.subjectMixers
dc.subjectRadio astronomy
dc.subjectGain
dc.subjectImage rejection
dc.subjectMillimeter-wave technology
dc.subjectMultichip modules (MCM)
dc.subjectSideband separation
dc.title18-45-GHz sideband-separating downconverter with RF image rejection calibration
dc.typePostprint Article

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