NIST-Traceable Microwave Power Measurement in a Waveguide Calorimeter With Correlated Uncertainties

To realize microwave power traceability, we apply a newly developed calibration technique for measuring the correction factor of a calorimeter with a vector network analyzer in the WR-15 frequency band. The wave-parameter approach is used to formulate analytic expressions for the correction factor and effective efficiency. This allows us to systematically track the uncertainty with correlation along an unbroken path. Measurement results are consistent with what was previously obtained by use of the conventional method.