When several modes are excited, averaged mode bandwidth over all the modes excited is usually used. Each of these resonating modes can be characterized by its Q-factor, which is the center frequency over the mode bandwidth. When a signal at a certain frequency is transmitted through a reverberation chamber, several cavity modes will be excited. Coherence bandwidth is defined as the frequency range over which the channel is correlated. For such measurements the delay spread and coherence bandwidth are of relevance. Reverberation chamber can also be used to measure total radiated power and total isotropic sensitivity of active mobile phones. It may also be sued to control the number of excited modes in the chamber, and thereby also the number of independent samples in order to generate enough independent samples to improve the measurement accuracy. ![]() For these measurements the intrinsic average mode bandwidth of the chamber is of interest as it determines the averaged power transmission level of the chamber. It has been used to measure antenna radiation efficiency and diversity gains. The chamber makes use of frequency stirring, platform stirring, and polarization stirring to improve measurement accuracy. The reverberation chamber used here is 1.8 m х 1.4 m х 1.2 m in size. ![]() The reverberation chamber is basically a metal cavity with many excited modes which are stirred to create a statistical isotropic field environment with Rayleigh distributed magnitudes of the field.
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