Antenna efficiency measurement from quality factor estimation in reverberation chamber

This communication deals with a method that enables to extract antenna efficiency estimation from reverberation chamber measurements and more specifically from the composite Q-factor estimation of the reverberation chamber. It is another variant of antenna efficiency measurement method in a reverberation chamber that takes advantage of the properties of the composite Q-factor that involves various components including the quality factor of antennas themselves. We show that in a well-overmoded cavity, the Q-factor measured from two antennas in the chamber gives access to the contrast of their efficiency. Estimation uncertainty is discussed with regard to the substitution method.