Abstract
This paper proposes a new method for determining the correction factor of a newly developed waveguide primary power measurement system (i.e., microcalorimeter), based on the electromagnetic field theory analysis for waveguide thermal isolation section (TIS) in foil short measurement mode. The new method determines the contribution of the power dissipated within the TIS into the correction factor, in term of the physical dimensions of the TIS. Performance comparison and analysis show that the newly proposed method can significantly reduce the measurement uncertainty when evaluating the correction factor of waveguide microcalorimeters.
Highlights
Microcalorimeters have been recognized to be an effective solution for radio frequency (RF), microwave, and millimeter-wave power measurements [1,2,3], and have been successfully developed within the National Metrology Institutes worldwide over past few decades [4,5,6,7,8]
Proper determination of the power ratio ρ between PFS and Pi,FS in “Foil Short” measurements becomes very important for evaluating the system constant φ of a waveguide microcalorimeter, and thereby its correction factor g for calibrating the thermistor mounts
Comparison results of the measured effective efficiency for one of the traveling standards, Hughes 45774H-1100 thermistor power sensors are presented in Figure 6 for the whole frequency range of 50 to 75 GHz, using the proposed method in this paper and compared to the primary power measurement systems at National Institute of Standards and Technology (NIST) and Physikalisch-Technische Bundesanstalt (PTB)
Summary
Microcalorimeters have been recognized to be an effective solution for radio frequency (RF), microwave, and millimeter-wave power measurements [1,2,3], and have been successfully developed within the National Metrology Institutes worldwide over past few decades [4,5,6,7,8]. To accurately determine its correction factor g, a method based on the measurement of offset shorts of different length followed by one single calibration measurement of a DUT has been proposed in [10] Another method based on attaching a thermistor sensor into the waveguide thermal isolation section (TIS) to accurately measure its temperature change has been proposed in [12]. Both the methods are found to have good performance during the evaluations of a WR-22 (33–50 GHz) waveguide microcalorimeter.
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