Reverberation Chamber Technology

A reverberation chamber is essentially a large reflective enclosure, or cavity, that will resonate when signals are introduced into it. These resonances makes microwave signals reverberate, similar to how sound reverberate in an enclosure.

As signals bounce off the walls and objects in the chamber they interfere. This constructive and destructive interference of multiple signal reflections form cavity modes. A reverberation chamber adds special stirring functions to move the points of constructive and destructive interference around in the chamber. By proper stirring, multipath fading effects can be distributed in a statistically well defined and repeatable way inside the chamber. This multipath fading environment is particularly appropriate to today's small, multi-purpose and high data rate wireless devices.

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Technology Articles

Testing Communication System Performance in Reverberation Chamber

Base stations and/or terminals with multi-antenna configurations are expected to significantly contribute to much higher bit rates in mobile broadband systems. Higher bit rates using multi-antenna systems can, when there is rich scattering in the communication channel, be achieved 1) by increasing the modulation rate and/or reducing the coding rate as the Signal to Noise Ratio (SNR) is increased through the use of diversity combining, or

Diversity and MIMO Measurements

A reverberation chamber is ideally suited for testing antennas for multi-antenna technologies such as diversity and MIMO. Bluetest Flow for diversity and MIMO measurements are well-proven and will give you instant feedback of the performance of the antenna array after the measurement is finished - no waiting time needed! In combination with the extreme measurement speed, the user will have the antenna performance in a single minute only.

Antenna Efficiency

Antenna efficiency goes under the category of Bluetest passive measurements in the reverberation chamber. An important parameter for all different types of antennas is radiation efficiency and is a basic parameter for all antenna designs. In fact, it is the dominating factor for antenna performance in multipath environments.

Bluetest Patents

Over the last decade Bluetest has launched a series of innovations around the technology of reverberation chambers. Not content with a theoretical proof-of-concept, we have refined these innovations into mature products that solve critical measurement needs worldwide. The Bluetest reverberation chambers, their stirring techniques and measurement technologies are protected by granted patents and patent applications. Some of which include U.S. Patent No. 7 286 961, U.S. Patent No. 7 444 264, Japanese Patent No. 4 528 480, and European Patent No. 1 269 203.

TRP/TIS Measurements

Total Radiated Power (TRP) and Total Isotropic Sensitivity (TIS) goes under the category of Bluetest's active measurements. Active measurements means that the transmitter/receiver in the DUT is active and powered up. Active measurements will give you a complete overview of how the whole system in your device is performing. These are parameters directly related to the antenna radiation efficiency,

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