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We have proposed and discussed a method to calibrate the effective noise temperature (ENT) of a noise source by using an auxiliary transmission line (ATL). A cryogenic 7-mm coaxial noise source was developed for verifying the ATL method. The ENT is determined from the parameters evaluated by a radiometer and the available power ratio of the transmission line measured by a vector network analyzer....
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...
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