H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
351/19
H01Q 3/26 (2006.01) H01Q 5/00 (2006.01) H01Q 21/20 (2006.01) H01Q 25/00 (2006.01)
Patent
CA 1070823
INTERLEAVED ANTENNA ARRAY FOR USE IN A MULTIPLE INPUT ANTENNA SYSTEM ABSTRACT An interleaved antenna array is disclosed in conjunction with an improved multiple transmitter antenna system for simultaneously generating two independent groups of com- posite radiation patterns for two separate pluralities of independent radio devices. A first plurality of isolated independent radio transmitters is coupled, without any signal cancellation, to each and every one of a first plurality of independent antenna elements which form a first group of composite radiation patterns for these trans- mitters. A second plurality of transmitters is likewise coupled to a second plurality of antenna elements which create a second group of composite patterns for these transmitters. The antenna elements of the first and second pluralities are alternately circumferentially disposed about a central axis and each produces a 90° half power beam width radiation pattern which is directed radially away from the central axis. First and second combining networks produce 90° electrical phase shifts between the adjacent radiation patterns produced by the elements in each of the two pluralities, respectively. By providing such an interleaved antenna array for first and second pluralities of indep- endent transmitters, a single multiple input antenna system is provided which has a small size and produces a uniform omnidirectional pattern for each of the transmitters while maintaining isolation between each transmitter.
265721
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