An experimental evaluation of a cryogenic noise source by a sliding short method in the frequency range of 8 GHz to 12 GHz

A cryogenic noise source (CNS) cooled by liquid nitrogen (LN2) is constructed and evaluated in the frequency range of 8 GHz to 12 GHz (WR-90 waveguide band). A noise temperature of the CNS is changed from the boiling temperature of LN2 by a correction factor (CF) related to loss and temperature distribution of a transmission line (TL). We have investigated the CF by a sliding short method using a total-power radiometer. Comparison results of the noise temperature by the radiometer with two calibrated noise sources proved validity of the CF.

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