Broadband omnidirectional array antenna system

Details Broadband omnidirectional array antenna system Broadband omnidirectional array antenna system

2007-01-30

2007-01-30

Phan, Tho (Department: 2821)

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

C343S790000, C343S798000

Reexamination Certificate

active

11140704

ABSTRACT:
Broadband omnidirectional, vertically polarized communications antenna systems are disclosed. The antenna systems comprises a plurality of center-fed stacked dipole radiating elements disposed along a central axis, a coaxial feed line coupled between each of the stacked radiating elements. In certain embodiments, a two-wire balun is coupled to a feed point of each radiating element and a shunt inductor and capacitor are coupled to each radiating element. Other embodiments do not require the use of the balun. Certain embodiments use a printed-circuit dipole having a flat shape. Other embodiments use a metal dipole having a cylindrical shape. The array antenna systems may be stacked vertically in separate bays each with its independent RF port.

REFERENCES:
patent: 4186403 (1980-01-01), Dorne
patent: 4369449 (1983-01-01), MacDougall
patent: 4638813 (1987-01-01), Turner
patent: 5274391 (1993-12-01), Connolly
patent: 6911947 (2005-06-01), Cranor et al.

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