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We derive the systematic uncertainty of the efficiency for the reflection method. And we evaluate the uncertainty of the efficiency for 40 mm monopole antenna using measured 64 reflection coefficients in the cavity and find that the uncertainty is not always dominated by the measurement in the cavity. In future, we will evaluate the uncertainty for various combinations of the sliding shorts.
In evaluating the performance of the small antenna, one of the most important parameters is the radiation efficiency as well as the radiation power. If the input power of the antenna is measured, the radiation power can be determined by multiplying the radiation efficiency by the input power. One of the techniques for measuring the radiation efficiency is the pattern integral method which needs a...
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