Room electromagnetics

Jørgen Bach Andersen

doi:10.1109/MAP.2007.376642

Room electromagnetics

2007-04-01

89

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J

Jørgen Bach Andersen *

J

Jesper Ødum Nielsen

G

Gert Frølund Pedersen

DOI：10.1109/MAP.2007.376642

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In analogy with the established discipline of room acoustics, various aspects of diffuse wideband microwave propagation in a room are treated. It is shown that an equivalent to Sabine's equation for reverberation time in a room is valid for the completely diffused field, depending only on the volume, the surface area, and an effective absorption coefficient. An exponential decay of the power as a function of the delay is a consequence of the assumptions. Furthermore, the concept of a reverberation distance is also valid. This is the distance from a transmitting antenna where the received diffuse, randomly scattered power equals the direct line-of-sight received power, such that the diffuse power dominates for distances larger than the reverberation distance. A number of measurements in a large room support the theory with an effective absorption coefficient of 0.5. The power delay profiles around the room from a transmitter in the ceiling vary only in the first arriving part of the impulse, whereas the tail, being dominated by the diffuse field, has the same power level for a given delay and the same decay rate all over the room. It is also a consequence of the theory that the diffuse fields incident on an antenna are uniformly distributed in angle.

Keyword:

indoor radio communication

transient response

diffuse fields

delay effects

intersymbol interference

Room electromagnetics

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