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Effective efficiency in waveguide R-400 (WR-22)

The national metrology institutes of the United Kingdom (NPL), France (LCIE), the United States (NIST), and the Russian Federation (VNIIFTRI) have completed an international comparison of radio frequency (rf) power measurement capability in rectangular waveguide R-400 (WR-22). Each laboratory measured the effective efficiency and reflection coefficient of the same bolometric power sensors in the frequency range from 33 GHz to 50 GHz in 1 GHz steps. This paper summarizes the results of this comparison.