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강태원(Tae-Weon Kang),김정환(Jeong-Hwan Kim),박정일(Jeong-II Park) 한국전자파학회JEES 2004 Journal of Electromagnetic Engineering and Science Vol.4 No.2
In this paper, the uncertainty in the calibration of coaxial thermal noise sources using a noise figure measuring (NFM) equipment is evaluated. Contributions to the uncertainty such as the calibration uncertainty of the standard noise source, mismatch, measurement of adapter efficiency, ambient temperature variation, and repeatability are evaluated in the frequency range of 10 MHz to 18 GHz. Results show that the expanded uncertainty(k=2) is 0.23 dB for the noise sources of 5 dB and 15 dB ENR, and 0.27 dB for those of 21 dB.