Abstract
A standard of attenuation for microwave measurements has been established using the heterodyne or intermediate-frequency substitution method of calibrating microwave attenuators. A preliminary model of the waveguide-below-cutoff standard attenuator has been built, tested, and improved until its accuracy is within 0.01 decibel per 20 decibels. Accuracy of the entire unit is within 0.02 decibel in the 0–10-decibel range and within 0.2 per cent of the measured attenuation in decibels in the 10–50-decibel range.
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