Communications: radio wave antennas – Antennas – With coupling network or impedance in the leadin
Patent
1975-12-22
1978-07-18
Lieberman, Eli
Communications: radio wave antennas
Antennas
With coupling network or impedance in the leadin
343844, H01Q 2106
Patent
active
041019016
ABSTRACT:
An interleaved antenna array is disclosed in conjunction with an improved multiple transmitter antenna system for simultaneously generating two independent groups of composite 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 transmitters. 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.degree. half power beam width radiation pattern which is directed radially away from the central axis. First and second combining networks produce 90.degree. 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 independent 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.
REFERENCES:
patent: 3056961 (1962-10-01), Mitchell
patent: 3193830 (1965-07-01), Provencher
patent: 3295134 (1966-12-01), Lowe
patent: 3375524 (1968-03-01), Kunemund et al.
patent: 3560985 (1971-02-01), Lyon
patent: 3623111 (1971-11-01), Provencher et al.
Gillman James W.
Lieberman Eli
Melamed Phillip H.
Motorola Inc.
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