Sideband-separating MMIC receivers for observation in the 3-mm band
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A4 Artikkeli konferenssijulkaisussa
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Date
2016
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Major/Subject
Mcode
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Language
en
Pages
18
Series
MILLIMETER, SUBMILLIMETER, AND FAR-INFRARED DETECTORS AND INSTRUMENTATION FOR ASTRONOMY VIII, Proceedings of SPIE, Volume 9914
Abstract
Wideband receivers for the 3-mm band were developed for CARMA, the Combined Array for Research in Millimeter wave Astronomy. Three cryogenic MMIC (monolithic microwave integrated circuit) amplifiers manufactured in InP 35-nm technology are combined in a block with waveguide probes and gain equalizers to cover the 80-116 GHz band. These are followed by a sideband-separating mixer that has two 17 GHZ wide outputs, for upper and lower sidebands. Each receiver has a feed horn followed by a circular-to-linear polarizer and orthomode transducer. The two polarizations are amplified by the cryogenic MMICs, and the outputs downconverted in sideband separating mixers, resulting in four 1-18 GHz channels that can be simultaneously correlated. The first receiver was tested in the lab, and on-sky tests conducted at CARMA. Measured noise temperatures were in the range 40-70 K, with a sideband rejection of about 15 dB.Description
Keywords
Receivers, microwaves, millimeterwaves, sideband separation, interferometer, quadrature hybrid
Other note
Citation
Lamb, J W, Cleary, K A, Gawande, R S, Kooi, J W, Laxen, M P, Plambeck, R L, Reeves, R A, Kangaslahti, P P & Varonen, M 2016, Sideband-separating MMIC receivers for observation in the 3-mm band . in WS Holland & J Zmuidzinas (eds), MILLIMETER, SUBMILLIMETER, AND FAR-INFRARED DETECTORS AND INSTRUMENTATION FOR ASTRONOMY VIII ., UNSP 99140H, Proceedings of SPIE, vol. 9914, SPIE, Conference on Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy, Edinburgh, United Kingdom, 28/06/2016 . https://doi.org/10.1117/12.2233106