Modular hub array antenna

Details Modular hub array antenna Modular hub array antenna

2000-07-26

2001-10-02

Phan, Tho (Department: 2821)

Communications: radio wave antennas

Antennas

Slot type

C343S770000, C333S137000

Reexamination Certificate

active

06297782

ABSTRACT:

FIELD OF THE INVENTION
The invention relates generally to a modular antenna array fed by a hybrid network including both waveguide and suspended stripline.
BACKGROUND ART
Radiating elements of antennas for use at wavelengths in the millimeter-to-centimeter range are typically fed either by waveguide or stripline. While exhibiting lower loss, waveguide is significantly larger than corresponding stripline type components. Point-to-multipoint broadband wireless communication applications require both low-loss design and compact packaging.
SUMMARY OF THE INVENTION
In accordance with preferred embodiments of the invention, there is provided an array antenna. The array antenna has a plurality of radiating elements, each element radiating electromagnetic radiation into a region of space defined about a primary radiation direction. The array antenna, furthermore, has a stripline network for feeding each of the radiating elements and also a waveguide power splitter for coupling power into the stripline network.
In accordance with alternate embodiments of the invention, the array antenna may also have a choke flange substantially surrounding the radiating elements in a plane transverse to the primary radiation direction. A radome may be provided for protection of the radiating elements from ambient conditions.
In accordance with yet further embodiments of the invention, the plurality of radiating elements may be rectangular slots. The waveguide power splitter may include a waveguide characterized by a height measured between broad parallel faces of the waveguide, a septum disposed parallel to the broad faces of the waveguide, and a step discontinuity in the height of the waveguide.
The dominant polarization of the plurality of radiating elements may be changed by substitution of the plurality of radiating elements and insertion of a waveguide polarization rotator, and the azimuthal distribution of the radiation pattern of the array antenna may be changed by substitution of the choke flange by a second choke flange.


REFERENCES:
patent: 3803617 (1974-04-01), Fletcher et al.
patent: 4588962 (1986-05-01), Saito et al.
patent: 4716415 (1987-12-01), Kelly
patent: 5291565 (1994-03-01), Schaffner et al.
patent: 5870063 (1999-02-01), Cherrette et al.
patent: 6154176 (2000-11-01), Fathy et al.

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