Abstract
In this chapter, five typical methods to measure the antenna radiation efficiency in an RC have been discussed. The standard reference antenna method is general and performs well, but a reference antenna is needed. Three non-reference antenna methods overcome the problem to use a reference antenna of known efficiency. However, they require additional prerequisites or antennas. The time-domain methods are time efficient, especially for UWB antennas. All these methods have different advantages and disadvantages, thus there is not a best method. A suitable method can be chosen depending on the measurement conditions, requirements, and type of antennas under test. Statistical analyses of the measured antenna efficiency are also given in this chapter. In particular, the presented method offering an accurate theoretical analysis on the measurement uncertainty has been illustrated on the standard reference method.
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