Importance

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Abstract

A communication system which utilizes the building metal frame as a communication medium is described. More particularly, and in accordance with one embodiment of the present invention, a wire coil is located near to one of the frame pieces so that the coil lays flat in the plane of the building face. A time varying current in the coil creates a time varying magnetic dipole field. This field changes the flux within a 'flux window' which is defined as one of the rectangular sections formed by the frame steel members. This changing flux creates a time varying potential around the window, which creates a time varying current that acts in opposition to the induced flux. This current also excites a time varying flux in the neighboring flux windows, which induces time varying fluxes in their neighbors and so on. Generally, a transmit/receive coil is located at each distribution board and relays ('mutter') the collected readings from one floor to the one below it and so on until all the readings are collected at the basement.

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First Claim