Variability of the Mean Received Power from Several In-band Antennas in Reverberation Chambers

In-band antennas are used in reverberation chamber testing as receive antennas for several different functions including establishing a reference during chamber calibration and certification; establishing the desired test level and monitoring the test environment during the actual test. Historically there have been discussions about whether all in-band antennas will provide the same measured received power values in reverberation chambers or whether there will be significant differences in measured power from different antenna types. Attempts to address this issue have resulted in defining a range of antenna efficiencies with some included in compliance Standards. This paper provides test data on the measured received power from different antennas in two reverberation chambers over five different frequencies and highlights some of the differences and potential reasons for observed differences.