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Sideband ratio in double sideband and sidebandseparating receivers with a michelson inferometer

Romanini, M. (2007) Sideband ratio in double sideband and sidebandseparating receivers with a michelson inferometer. Master's Thesis / Essay, Astronomy.

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Terahertz heterodyne receivers typically use double sideband (DSB) or sidebandseparating (2SB) mixers. The precise knowledge of the receiver sideband ratio (SBR) is a fundamental requirement for the calibration of the data taken with this type of receivers. At the moment the spectroscopic techniques developed for the determination of the SBR of DSB mixers (such as Martin Pupplet interferometry and Gas cell technique) and 2SB mixer (such as the technique described by Kerr) are rather complicated. Here, we present sideband ratio measurements of a DSB and a 2SB receiver in the 600-720 GHz band (ALMA Band 9) using a Michelson interferometer as input filter. The main requirement for this method is that the resolution must be high enough to allow distinguishing between the upper and lower sidebands. The advantages of this method are, first, the simplicity of the experimental setup, and, second, the possibility to identify and calibrate out standing waves in the signal and local oscillator paths. For DSB receivers, our procedure allows using exactly the same receiver configuration for both direct and heterodyne detections. Based on our results on the DSB receiver we estimate that the direct detection can be used to predict the SBR if an accuracy of 20% is sufficient. Also for the 2SB receiver we found a satisfactory agreement between the SBR calculated from the direct detection and the SBR calculated with the method described by Kerr. Further experiments are needed to improve and better understand the results for both types of mixers.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Astronomy
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:28
Last Modified: 15 Feb 2018 07:28

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