Patent ID: 6112056
Filing Date: 2000-08-29
Classification: H04W,Y02D

Abstract:
A short range, wireless, point-to-multipoint communications system comprising:a plurality of transmitter systems each broadcasting over a same given frequency band wherein each of said transmitter systems comprises a plurality of contiguous sub-frequency band transmitters;a plurality of unidirectional transmitting antennas located at a common location of a node coupled to said transmitter systems and positioned to radiate in different directions about said node;said unidirectional antennas being of orthogonal polarization types and positioned such that one polarization type is spaced about said node between orthogonal polarization types so the polarization of the transmitted signal alternates orthogonal polarization about said node;each of said unidirectional antennas comprising a plurality of linear arrays of radiating elements with a phase shifter between each radiating element, each of said linear arrays of said unidirectional antennas coupled to one of said contiguous sub-frequency band transmitters; andplurality of receiver stations with each of said receiver stations having a directional receiver station antenna directed and polarized to receive signals from said unidirectional transmitting antennas.